| Message ID | 20220323162820.110806-3-caleb@connolly.tech (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | iio: adc: introduce Qualcomm SPMI Round Robin ADC | expand |
On Wed, 23 Mar 2022, Caleb Connolly wrote: > From: Caleb Connolly <caleb.connolly@linaro.org> > > Some PMIC functions such as the RRADC need to be aware of the PMIC > chip revision information to implement errata or otherwise adjust > behaviour, export the PMIC information to enable this. > > This is specifically required to enable the RRADC to adjust > coefficients based on which chip fab the PMIC was produced in, > this can vary per unique device and therefore has to be read at > runtime. > > Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > --- > drivers/mfd/qcom-spmi-pmic.c | 261 +++++++++++++++++++----------- > include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++ > 2 files changed, 231 insertions(+), 90 deletions(-) > create mode 100644 include/soc/qcom/qcom-spmi-pmic.h Apologies for the delay. I've been snowed under. > diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c > index 1cacc00aa6c9..d8e54d9d3448 100644 > --- a/drivers/mfd/qcom-spmi-pmic.c > +++ b/drivers/mfd/qcom-spmi-pmic.c > @@ -3,11 +3,16 @@ > * Copyright (c) 2014, The Linux Foundation. All rights reserved. > */ > > +#include <linux/device.h> > +#include <linux/errno.h> > +#include <linux/gfp.h> > #include <linux/kernel.h> > #include <linux/module.h> > #include <linux/spmi.h> > +#include <linux/types.h> > #include <linux/regmap.h> > #include <linux/of_platform.h> > +#include <soc/qcom/qcom-spmi-pmic.h> > > #define PMIC_REV2 0x101 > #define PMIC_REV3 0x102 > @@ -17,106 +22,151 @@ > > #define PMIC_TYPE_VALUE 0x51 > > -#define COMMON_SUBTYPE 0x00 > -#define PM8941_SUBTYPE 0x01 > -#define PM8841_SUBTYPE 0x02 > -#define PM8019_SUBTYPE 0x03 > -#define PM8226_SUBTYPE 0x04 > -#define PM8110_SUBTYPE 0x05 > -#define PMA8084_SUBTYPE 0x06 > -#define PMI8962_SUBTYPE 0x07 > -#define PMD9635_SUBTYPE 0x08 > -#define PM8994_SUBTYPE 0x09 > -#define PMI8994_SUBTYPE 0x0a > -#define PM8916_SUBTYPE 0x0b > -#define PM8004_SUBTYPE 0x0c > -#define PM8909_SUBTYPE 0x0d > -#define PM8028_SUBTYPE 0x0e > -#define PM8901_SUBTYPE 0x0f > -#define PM8950_SUBTYPE 0x10 > -#define PMI8950_SUBTYPE 0x11 > -#define PM8998_SUBTYPE 0x14 > -#define PMI8998_SUBTYPE 0x15 > -#define PM8005_SUBTYPE 0x18 > -#define PM660L_SUBTYPE 0x1A > -#define PM660_SUBTYPE 0x1B > -#define PM8150_SUBTYPE 0x1E > -#define PM8150L_SUBTYPE 0x1f > -#define PM8150B_SUBTYPE 0x20 > -#define PMK8002_SUBTYPE 0x21 > -#define PM8009_SUBTYPE 0x24 > -#define PM8150C_SUBTYPE 0x26 > -#define SMB2351_SUBTYPE 0x29 > +struct qcom_spmi_dev { > + int num_usids; > + struct qcom_spmi_pmic pmic; > +}; > + > +#define N_USIDS(n) ((void *)n) > > static const struct of_device_id pmic_spmi_id_table[] = { > - { .compatible = "qcom,pm660", .data = (void *)PM660_SUBTYPE }, > - { .compatible = "qcom,pm660l", .data = (void *)PM660L_SUBTYPE }, > - { .compatible = "qcom,pm8004", .data = (void *)PM8004_SUBTYPE }, > - { .compatible = "qcom,pm8005", .data = (void *)PM8005_SUBTYPE }, > - { .compatible = "qcom,pm8019", .data = (void *)PM8019_SUBTYPE }, > - { .compatible = "qcom,pm8028", .data = (void *)PM8028_SUBTYPE }, > - { .compatible = "qcom,pm8110", .data = (void *)PM8110_SUBTYPE }, > - { .compatible = "qcom,pm8150", .data = (void *)PM8150_SUBTYPE }, > - { .compatible = "qcom,pm8150b", .data = (void *)PM8150B_SUBTYPE }, > - { .compatible = "qcom,pm8150c", .data = (void *)PM8150C_SUBTYPE }, > - { .compatible = "qcom,pm8150l", .data = (void *)PM8150L_SUBTYPE }, > - { .compatible = "qcom,pm8226", .data = (void *)PM8226_SUBTYPE }, > - { .compatible = "qcom,pm8841", .data = (void *)PM8841_SUBTYPE }, > - { .compatible = "qcom,pm8901", .data = (void *)PM8901_SUBTYPE }, > - { .compatible = "qcom,pm8909", .data = (void *)PM8909_SUBTYPE }, > - { .compatible = "qcom,pm8916", .data = (void *)PM8916_SUBTYPE }, > - { .compatible = "qcom,pm8941", .data = (void *)PM8941_SUBTYPE }, > - { .compatible = "qcom,pm8950", .data = (void *)PM8950_SUBTYPE }, > - { .compatible = "qcom,pm8994", .data = (void *)PM8994_SUBTYPE }, > - { .compatible = "qcom,pm8998", .data = (void *)PM8998_SUBTYPE }, > - { .compatible = "qcom,pma8084", .data = (void *)PMA8084_SUBTYPE }, > - { .compatible = "qcom,pmd9635", .data = (void *)PMD9635_SUBTYPE }, > - { .compatible = "qcom,pmi8950", .data = (void *)PMI8950_SUBTYPE }, > - { .compatible = "qcom,pmi8962", .data = (void *)PMI8962_SUBTYPE }, > - { .compatible = "qcom,pmi8994", .data = (void *)PMI8994_SUBTYPE }, > - { .compatible = "qcom,pmi8998", .data = (void *)PMI8998_SUBTYPE }, > - { .compatible = "qcom,pmk8002", .data = (void *)PMK8002_SUBTYPE }, > - { .compatible = "qcom,smb2351", .data = (void *)SMB2351_SUBTYPE }, > - { .compatible = "qcom,spmi-pmic", .data = (void *)COMMON_SUBTYPE }, > + { .compatible = "qcom,pm660", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm660l", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8004", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8005", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8019", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8028", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8110", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8150", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8150b", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8150c", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8150l", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8226", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8841", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8901", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8909", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8916", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8941", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8950", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8994", .data = N_USIDS(2) }, > + { .compatible = "qcom,pm8998", .data = N_USIDS(2) }, > + { .compatible = "qcom,pma8084", .data = N_USIDS(2) }, > + { .compatible = "qcom,pmd9635", .data = N_USIDS(2) }, > + { .compatible = "qcom,pmi8950", .data = N_USIDS(2) }, > + { .compatible = "qcom,pmi8962", .data = N_USIDS(2) }, > + { .compatible = "qcom,pmi8994", .data = N_USIDS(2) }, > + { .compatible = "qcom,pmi8998", .data = N_USIDS(2) }, > + { .compatible = "qcom,pmk8002", .data = N_USIDS(2) }, > + { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, > + { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, > { } > }; > > -static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) > +#undef N_USIDS Why is this here? Can't we use a unique macro instead? > +/* > + * A PMIC can be represented by multiple SPMI devices, but > + * only the base PMIC device will contain a reference to > + * the revision information. > + * > + * This function takes a pointer to a function device and > + * returns a pointer to the base PMIC device. > + * > + * This only supports PMICs with 1 or 2 USIDs. > + */ > +static struct spmi_device *qcom_pmic_get_base_usid(struct device *dev) > { > - unsigned int rev2, minor, major, type, subtype; > - const char *name = "unknown"; > - int ret, i; > + struct spmi_device *sdev; > + struct qcom_spmi_dev *ctx; > + struct device_node *spmi_bus; > + struct device_node *other_usid = NULL; > + int function_parent_usid, ret; > + u32 pmic_addr; > > - ret = regmap_read(map, PMIC_TYPE, &type); > - if (ret < 0) > - return; > + if (!of_match_device(pmic_spmi_id_table, dev)) > + return ERR_PTR(-EINVAL); Can this happen? How else would the device have been enumerated? > + sdev = to_spmi_device(dev); > + ctx = spmi_device_get_drvdata(sdev); This function looks like abstraction for the sake of abstraction. Why not just use dev_get_drvdata()? > + /* > + * Quick return if the function device is already in the base > + * USID. This will always be hit for PMICs with only 1 USID. > + */ > + if (sdev->usid % ctx->num_usids == 0) > + return sdev; > + > + function_parent_usid = sdev->usid; > + > + /* > + * Walk through the list of PMICs until we find the sibling USID. > + * The goal is to find the first USID which is less than the > + * number of USIDs in the PMIC away, e.g. for a PMIC with 2 USIDs "array" perhaps? > + * where the function device is under USID 3, we want to find the > + * device for USID 2. > + */ > + spmi_bus = of_get_parent(sdev->dev.of_node); > + do { > + other_usid = of_get_next_child(spmi_bus, other_usid); '\n' > + ret = of_property_read_u32_index(other_usid, "reg", 0, &pmic_addr); > + if (ret) > + return ERR_PTR(ret); '\n' > + sdev = spmi_device_from_of(other_usid); > + if (sdev == NULL) { if (!sdev) > + /* > + * If the base USID for this PMIC hasn't probed yet > + * but the secondary USID has, then we need to defer > + * the function driver so that it will attempt to > + * probe again when the base USID is ready. > + */ > + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) Double " ". Over-bracketing of statements with matching operands. > + return ERR_PTR(-EPROBE_DEFER); > + > + continue; > + } > + > + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) > + return sdev; Wouldn't it be better written like this: > + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) { > + sdev = spmi_device_from_of(other_usid); > + if (!sdev) > + /* > + * If the base USID for this PMIC hasn't probed yet > + * but the secondary USID has, then we need to defer > + * the function driver so that it will attempt to > + * probe again when the base USID is ready. > + */ > + return ERR_PTR(-EPROBE_DEFER); > + return sdev; > + } [...] > + } while (other_usid->sibling); > + > + return ERR_PTR(-ENODATA); > +} > + > +static inline void pmic_print_info(struct device *dev, struct qcom_spmi_pmic *pmic) > +{ > + dev_dbg(dev, "%x: %s v%d.%d\n", > + pmic->subtype, pmic->name, pmic->major, pmic->minor); > +} More abstraction for no apparent reason. > - if (type != PMIC_TYPE_VALUE) > - return; > +static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, > + struct qcom_spmi_pmic *pmic) > +{ > + int ret; > > - ret = regmap_read(map, PMIC_SUBTYPE, &subtype); > + ret = regmap_read(map, PMIC_TYPE, &pmic->type); > if (ret < 0) > - return; > + return ret; > > - for (i = 0; i < ARRAY_SIZE(pmic_spmi_id_table); i++) { > - if (subtype == (unsigned long)pmic_spmi_id_table[i].data) > - break; > - } > + if (pmic->type != PMIC_TYPE_VALUE) > + return ret; > > - if (i != ARRAY_SIZE(pmic_spmi_id_table)) > - name = pmic_spmi_id_table[i].compatible; > + ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); > + if (ret < 0) > + return ret; > + > + pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; > > - ret = regmap_read(map, PMIC_REV2, &rev2); > + ret = regmap_read(map, PMIC_REV2, &pmic->rev2); > if (ret < 0) > - return; > + return ret; > > - ret = regmap_read(map, PMIC_REV3, &minor); > + ret = regmap_read(map, PMIC_REV3, &pmic->minor); > if (ret < 0) > - return; > + return ret; > > - ret = regmap_read(map, PMIC_REV4, &major); > + ret = regmap_read(map, PMIC_REV4, &pmic->major); > if (ret < 0) > - return; > + return ret; > > /* > * In early versions of PM8941 and PM8226, the major revision number > @@ -124,15 +174,34 @@ static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) > * Increment the major revision number here if the chip is an early > * version of PM8941 or PM8226. > */ > - if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) && > - major < 0x02) > - major++; > + if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && > + pmic->major < 0x02) Please define this magic number while you're at it. > + pmic->major++; > + > + if (pmic->subtype == PM8110_SUBTYPE) > + pmic->minor = pmic->rev2; > + > + pmic_print_info(dev, pmic); > > - if (subtype == PM8110_SUBTYPE) > - minor = rev2; > + return 0; > +} > + > +/** > + * qcom_pmic_get() - Get a pointer to the base PMIC device > + * > + * @dev: the pmic function device > + * @return: the struct qcom_spmi_pmic* pointer associated with the function device > + */ > +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) > +{ > + struct spmi_device *sdev = qcom_pmic_get_base_usid(dev->parent); > > - dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor); > + if (IS_ERR(sdev)) > + return ERR_CAST(sdev); > + > + return &((struct qcom_spmi_dev *)spmi_device_get_drvdata(sdev))->pmic; This is horrible. Please expand it out. > } > +EXPORT_SYMBOL(qcom_pmic_get); > > static const struct regmap_config spmi_regmap_config = { > .reg_bits = 16, > @@ -144,14 +213,26 @@ static const struct regmap_config spmi_regmap_config = { > static int pmic_spmi_probe(struct spmi_device *sdev) > { > struct regmap *regmap; > + struct qcom_spmi_dev *ctx; > + int ret; > > regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); > if (IS_ERR(regmap)) > return PTR_ERR(regmap); > > + ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL); > + if (!ctx) > + return -ENOMEM; > + > + ctx->num_usids = (long)of_device_get_match_data(&sdev->dev); Why does this need to be long? In fact, it's not is it? It's an int: +struct qcom_spmi_dev { + int num_usids; + struct qcom_spmi_pmic pmic; +}; > /* Only the first slave id for a PMIC contains this information */ > - if (sdev->usid % 2 == 0) > - pmic_spmi_show_revid(regmap, &sdev->dev); > + if (sdev->usid % ctx->num_usids == 0) { > + ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic); > + if (ret < 0) > + return ret; > + } > + spmi_device_set_drvdata(sdev, ctx); > > return devm_of_platform_populate(&sdev->dev); > } > diff --git a/include/soc/qcom/qcom-spmi-pmic.h b/include/soc/qcom/qcom-spmi-pmic.h > new file mode 100644 > index 000000000000..5400e6509fe8 > --- /dev/null > +++ b/include/soc/qcom/qcom-spmi-pmic.h > @@ -0,0 +1,60 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* Copyright (c) 2021 Linaro. All rights reserved. > + * Copyright (c) 2021 Caleb Connolly <caleb.connolly@linaro.org> Your very own Copyright? Why? Any not Author: instead? > + */ > + > +#ifndef __QCOM_SPMI_PMIC_H__ > +#define __QCOM_SPMI_PMIC_H__ > + > +#define COMMON_SUBTYPE 0x00 > +#define PM8941_SUBTYPE 0x01 > +#define PM8841_SUBTYPE 0x02 > +#define PM8019_SUBTYPE 0x03 > +#define PM8226_SUBTYPE 0x04 > +#define PM8110_SUBTYPE 0x05 > +#define PMA8084_SUBTYPE 0x06 > +#define PMI8962_SUBTYPE 0x07 > +#define PMD9635_SUBTYPE 0x08 > +#define PM8994_SUBTYPE 0x09 > +#define PMI8994_SUBTYPE 0x0a > +#define PM8916_SUBTYPE 0x0b > +#define PM8004_SUBTYPE 0x0c > +#define PM8909_SUBTYPE 0x0d > +#define PM8028_SUBTYPE 0x0e > +#define PM8901_SUBTYPE 0x0f > +#define PM8950_SUBTYPE 0x10 > +#define PMI8950_SUBTYPE 0x11 > +#define PM8998_SUBTYPE 0x14 > +#define PMI8998_SUBTYPE 0x15 > +#define PM8005_SUBTYPE 0x18 > +#define PM660L_SUBTYPE 0x1A > +#define PM660_SUBTYPE 0x1B > +#define PM8150_SUBTYPE 0x1E > +#define PM8150L_SUBTYPE 0x1f > +#define PM8150B_SUBTYPE 0x20 > +#define PMK8002_SUBTYPE 0x21 > +#define PM8009_SUBTYPE 0x24 > +#define PM8150C_SUBTYPE 0x26 > +#define SMB2351_SUBTYPE 0x29 > + > +#define PMI8998_FAB_ID_SMIC 0x11 > +#define PMI8998_FAB_ID_GF 0x30 > + > +#define PM660_FAB_ID_GF 0x0 > +#define PM660_FAB_ID_TSMC 0x2 > +#define PM660_FAB_ID_MX 0x3 > + > +struct qcom_spmi_pmic { > + unsigned int type; > + unsigned int subtype; > + unsigned int major; > + unsigned int minor; > + unsigned int rev2; > + const char *name; > +}; > + > +struct device; Can't you just include the correct header? > +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev); > + > +#endif /* __QCOM_SPMI_PMIC_H__ */
On 25/04/2022 16:03, Lee Jones wrote: > > On Wed, 23 Mar 2022, Caleb Connolly wrote: >> From: Caleb Connolly <caleb.connolly@linaro.org> >> >> Some PMIC functions such as the RRADC need to be aware of the PMIC >> chip revision information to implement errata or otherwise adjust >> behaviour, export the PMIC information to enable this. >> >> This is specifically required to enable the RRADC to adjust >> coefficients based on which chip fab the PMIC was produced in, >> this can vary per unique device and therefore has to be read at >> runtime. >> >> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> >> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >> --- >> drivers/mfd/qcom-spmi-pmic.c | 261 +++++++++++++++++++----------- >> include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++ >> 2 files changed, 231 insertions(+), 90 deletions(-) >> create mode 100644 include/soc/qcom/qcom-spmi-pmic.h > > Apologies for the delay. I've been snowed under. Hi Lee, Thanks a lot for the review, I had a few questions/clarifications > >> diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c >> index 1cacc00aa6c9..d8e54d9d3448 100644 >> --- a/drivers/mfd/qcom-spmi-pmic.c >> +++ b/drivers/mfd/qcom-spmi-pmic.c >> @@ -3,11 +3,16 @@ >> * Copyright (c) 2014, The Linux Foundation. All rights reserved. >> */ >> >> +#include <linux/device.h> >> +#include <linux/errno.h> >> +#include <linux/gfp.h> >> #include <linux/kernel.h> >> #include <linux/module.h> >> #include <linux/spmi.h> >> +#include <linux/types.h> >> #include <linux/regmap.h> >> #include <linux/of_platform.h> >> +#include <soc/qcom/qcom-spmi-pmic.h> >> >> #define PMIC_REV2 0x101 >> #define PMIC_REV3 0x102 >> @@ -17,106 +22,151 @@ >> >> #define PMIC_TYPE_VALUE 0x51 >> >> -#define COMMON_SUBTYPE 0x00 >> -#define PM8941_SUBTYPE 0x01 >> -#define PM8841_SUBTYPE 0x02 >> -#define PM8019_SUBTYPE 0x03 >> -#define PM8226_SUBTYPE 0x04 >> -#define PM8110_SUBTYPE 0x05 >> -#define PMA8084_SUBTYPE 0x06 >> -#define PMI8962_SUBTYPE 0x07 >> -#define PMD9635_SUBTYPE 0x08 >> -#define PM8994_SUBTYPE 0x09 >> -#define PMI8994_SUBTYPE 0x0a >> -#define PM8916_SUBTYPE 0x0b >> -#define PM8004_SUBTYPE 0x0c >> -#define PM8909_SUBTYPE 0x0d >> -#define PM8028_SUBTYPE 0x0e >> -#define PM8901_SUBTYPE 0x0f >> -#define PM8950_SUBTYPE 0x10 >> -#define PMI8950_SUBTYPE 0x11 >> -#define PM8998_SUBTYPE 0x14 >> -#define PMI8998_SUBTYPE 0x15 >> -#define PM8005_SUBTYPE 0x18 >> -#define PM660L_SUBTYPE 0x1A >> -#define PM660_SUBTYPE 0x1B >> -#define PM8150_SUBTYPE 0x1E >> -#define PM8150L_SUBTYPE 0x1f >> -#define PM8150B_SUBTYPE 0x20 >> -#define PMK8002_SUBTYPE 0x21 >> -#define PM8009_SUBTYPE 0x24 >> -#define PM8150C_SUBTYPE 0x26 >> -#define SMB2351_SUBTYPE 0x29 >> +struct qcom_spmi_dev { >> + int num_usids; >> + struct qcom_spmi_pmic pmic; >> +}; >> + >> +#define N_USIDS(n) ((void *)n) >> >> static const struct of_device_id pmic_spmi_id_table[] = { >> - { .compatible = "qcom,pm660", .data = (void *)PM660_SUBTYPE }, >> - { .compatible = "qcom,pm660l", .data = (void *)PM660L_SUBTYPE }, >> - { .compatible = "qcom,pm8004", .data = (void *)PM8004_SUBTYPE }, >> - { .compatible = "qcom,pm8005", .data = (void *)PM8005_SUBTYPE }, >> - { .compatible = "qcom,pm8019", .data = (void *)PM8019_SUBTYPE }, >> - { .compatible = "qcom,pm8028", .data = (void *)PM8028_SUBTYPE }, >> - { .compatible = "qcom,pm8110", .data = (void *)PM8110_SUBTYPE }, >> - { .compatible = "qcom,pm8150", .data = (void *)PM8150_SUBTYPE }, >> - { .compatible = "qcom,pm8150b", .data = (void *)PM8150B_SUBTYPE }, >> - { .compatible = "qcom,pm8150c", .data = (void *)PM8150C_SUBTYPE }, >> - { .compatible = "qcom,pm8150l", .data = (void *)PM8150L_SUBTYPE }, >> - { .compatible = "qcom,pm8226", .data = (void *)PM8226_SUBTYPE }, >> - { .compatible = "qcom,pm8841", .data = (void *)PM8841_SUBTYPE }, >> - { .compatible = "qcom,pm8901", .data = (void *)PM8901_SUBTYPE }, >> - { .compatible = "qcom,pm8909", .data = (void *)PM8909_SUBTYPE }, >> - { .compatible = "qcom,pm8916", .data = (void *)PM8916_SUBTYPE }, >> - { .compatible = "qcom,pm8941", .data = (void *)PM8941_SUBTYPE }, >> - { .compatible = "qcom,pm8950", .data = (void *)PM8950_SUBTYPE }, >> - { .compatible = "qcom,pm8994", .data = (void *)PM8994_SUBTYPE }, >> - { .compatible = "qcom,pm8998", .data = (void *)PM8998_SUBTYPE }, >> - { .compatible = "qcom,pma8084", .data = (void *)PMA8084_SUBTYPE }, >> - { .compatible = "qcom,pmd9635", .data = (void *)PMD9635_SUBTYPE }, >> - { .compatible = "qcom,pmi8950", .data = (void *)PMI8950_SUBTYPE }, >> - { .compatible = "qcom,pmi8962", .data = (void *)PMI8962_SUBTYPE }, >> - { .compatible = "qcom,pmi8994", .data = (void *)PMI8994_SUBTYPE }, >> - { .compatible = "qcom,pmi8998", .data = (void *)PMI8998_SUBTYPE }, >> - { .compatible = "qcom,pmk8002", .data = (void *)PMK8002_SUBTYPE }, >> - { .compatible = "qcom,smb2351", .data = (void *)SMB2351_SUBTYPE }, >> - { .compatible = "qcom,spmi-pmic", .data = (void *)COMMON_SUBTYPE }, >> + { .compatible = "qcom,pm660", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm660l", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8004", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8005", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8019", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8028", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8110", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8150", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8150b", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8150c", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8150l", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8226", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8841", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8901", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8909", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8916", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8941", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8950", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8994", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pm8998", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pma8084", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pmd9635", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pmi8950", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pmi8962", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pmi8994", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pmi8998", .data = N_USIDS(2) }, >> + { .compatible = "qcom,pmk8002", .data = N_USIDS(2) }, >> + { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, >> + { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, >> { } >> }; >> >> -static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) >> +#undef N_USIDS > > Why is this here? Can't we use a unique macro instead? This felt neat to do but yeah there's no reason to undefine the macro, I'll drop this. > >> +/* >> + * A PMIC can be represented by multiple SPMI devices, but >> + * only the base PMIC device will contain a reference to >> + * the revision information. >> + * >> + * This function takes a pointer to a function device and >> + * returns a pointer to the base PMIC device. >> + * >> + * This only supports PMICs with 1 or 2 USIDs. >> + */ >> +static struct spmi_device *qcom_pmic_get_base_usid(struct device *dev) >> { >> - unsigned int rev2, minor, major, type, subtype; >> - const char *name = "unknown"; >> - int ret, i; >> + struct spmi_device *sdev; >> + struct qcom_spmi_dev *ctx; >> + struct device_node *spmi_bus; >> + struct device_node *other_usid = NULL; >> + int function_parent_usid, ret; >> + u32 pmic_addr; >> >> - ret = regmap_read(map, PMIC_TYPE, &type); >> - if (ret < 0) >> - return; >> + if (!of_match_device(pmic_spmi_id_table, dev)) >> + return ERR_PTR(-EINVAL); > > Can this happen? How else would the device have been enumerated? This function gets called from "qcom_pmic_get()" which can be called by any driver, the check is to make sure it's only called from drivers which are children of a qcom PMIC. > >> + sdev = to_spmi_device(dev); >> + ctx = spmi_device_get_drvdata(sdev); > > This function looks like abstraction for the sake of abstraction. > > Why not just use dev_get_drvdata()? That seems more sensible. > >> + /* >> + * Quick return if the function device is already in the base >> + * USID. This will always be hit for PMICs with only 1 USID. >> + */ >> + if (sdev->usid % ctx->num_usids == 0) >> + return sdev; >> + >> + function_parent_usid = sdev->usid; >> + >> + /* >> + * Walk through the list of PMICs until we find the sibling USID. >> + * The goal is to find the first USID which is less than the >> + * number of USIDs in the PMIC away, e.g. for a PMIC with 2 USIDs > > "array" perhaps? > >> + * where the function device is under USID 3, we want to find the >> + * device for USID 2. >> + */ >> + spmi_bus = of_get_parent(sdev->dev.of_node); >> + do { >> + other_usid = of_get_next_child(spmi_bus, other_usid); > > '\n' > >> + ret = of_property_read_u32_index(other_usid, "reg", 0, &pmic_addr); >> + if (ret) >> + return ERR_PTR(ret); > > '\n' > >> + sdev = spmi_device_from_of(other_usid); >> + if (sdev == NULL) { > > if (!sdev) > >> + /* >> + * If the base USID for this PMIC hasn't probed yet >> + * but the secondary USID has, then we need to defer >> + * the function driver so that it will attempt to >> + * probe again when the base USID is ready. >> + */ >> + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) > > Double " ". Ack > > Over-bracketing of statements with matching operands. I don't think x - (y - 1) is equal to x - y - 1? Or am I misunderstanding you here? > >> + return ERR_PTR(-EPROBE_DEFER); >> + >> + continue; >> + } >> + >> + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) >> + return sdev; > > Wouldn't it be better written like this: Yeah > >> + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) { >> + sdev = spmi_device_from_of(other_usid); >> + if (!sdev) >> + /* >> + * If the base USID for this PMIC hasn't probed yet >> + * but the secondary USID has, then we need to defer >> + * the function driver so that it will attempt to >> + * probe again when the base USID is ready. >> + */ >> + return ERR_PTR(-EPROBE_DEFER); >> + return sdev; >> + } > > [...] > >> + } while (other_usid->sibling); >> + >> + return ERR_PTR(-ENODATA); >> +} >> + >> +static inline void pmic_print_info(struct device *dev, struct qcom_spmi_pmic *pmic) >> +{ >> + dev_dbg(dev, "%x: %s v%d.%d\n", >> + pmic->subtype, pmic->name, pmic->major, pmic->minor); >> +} > > More abstraction for no apparent reason. Oops, this got a bit messy over several reworks, I'll stick the dev_dbg back in pmic_spmi_load_revid() and drop this function. > >> - if (type != PMIC_TYPE_VALUE) >> - return; >> +static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, >> + struct qcom_spmi_pmic *pmic) >> +{ >> + int ret; >> >> - ret = regmap_read(map, PMIC_SUBTYPE, &subtype); >> + ret = regmap_read(map, PMIC_TYPE, &pmic->type); >> if (ret < 0) >> - return; >> + return ret; >> >> - for (i = 0; i < ARRAY_SIZE(pmic_spmi_id_table); i++) { >> - if (subtype == (unsigned long)pmic_spmi_id_table[i].data) >> - break; >> - } >> + if (pmic->type != PMIC_TYPE_VALUE) >> + return ret; >> >> - if (i != ARRAY_SIZE(pmic_spmi_id_table)) >> - name = pmic_spmi_id_table[i].compatible; >> + ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); >> + if (ret < 0) >> + return ret; >> + >> + pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; >> >> - ret = regmap_read(map, PMIC_REV2, &rev2); >> + ret = regmap_read(map, PMIC_REV2, &pmic->rev2); >> if (ret < 0) >> - return; >> + return ret; >> >> - ret = regmap_read(map, PMIC_REV3, &minor); >> + ret = regmap_read(map, PMIC_REV3, &pmic->minor); >> if (ret < 0) >> - return; >> + return ret; >> >> - ret = regmap_read(map, PMIC_REV4, &major); >> + ret = regmap_read(map, PMIC_REV4, &pmic->major); >> if (ret < 0) >> - return; >> + return ret; >> >> /* >> * In early versions of PM8941 and PM8226, the major revision number >> @@ -124,15 +174,34 @@ static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) >> * Increment the major revision number here if the chip is an early >> * version of PM8941 or PM8226. >> */ >> - if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) && >> - major < 0x02) >> - major++; >> + if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && >> + pmic->major < 0x02) > > Please define this magic number while you're at it. > >> + pmic->major++; >> + >> + if (pmic->subtype == PM8110_SUBTYPE) >> + pmic->minor = pmic->rev2; >> + >> + pmic_print_info(dev, pmic); >> >> - if (subtype == PM8110_SUBTYPE) >> - minor = rev2; >> + return 0; >> +} >> + >> +/** >> + * qcom_pmic_get() - Get a pointer to the base PMIC device >> + * >> + * @dev: the pmic function device >> + * @return: the struct qcom_spmi_pmic* pointer associated with the function device >> + */ >> +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) >> +{ >> + struct spmi_device *sdev = qcom_pmic_get_base_usid(dev->parent); >> >> - dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor); >> + if (IS_ERR(sdev)) >> + return ERR_CAST(sdev); >> + >> + return &((struct qcom_spmi_dev *)spmi_device_get_drvdata(sdev))->pmic; > > This is horrible. Please expand it out. > >> } >> +EXPORT_SYMBOL(qcom_pmic_get); >> >> static const struct regmap_config spmi_regmap_config = { >> .reg_bits = 16, >> @@ -144,14 +213,26 @@ static const struct regmap_config spmi_regmap_config = { >> static int pmic_spmi_probe(struct spmi_device *sdev) >> { >> struct regmap *regmap; >> + struct qcom_spmi_dev *ctx; >> + int ret; >> >> regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); >> if (IS_ERR(regmap)) >> return PTR_ERR(regmap); >> >> + ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL); >> + if (!ctx) >> + return -ENOMEM; >> + >> + ctx->num_usids = (long)of_device_get_match_data(&sdev->dev); > > Why does this need to be long? The compiler complains with ../drivers/mfd/qcom-spmi-pmic.c: In function 'pmic_spmi_probe': ../drivers/mfd/qcom-spmi-pmic.c:236:26: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] 236 | ctx->num_usids = (int)of_device_get_match_data(&sdev->dev); | Due to match data being void*. I wasn't able to find a better solution than casting this way, do you have any suggestions? I just found uintptr_t, maybe that might be more explicit? > > In fact, it's not is it? It's an int: > > +struct qcom_spmi_dev { > + int num_usids; > + struct qcom_spmi_pmic pmic; > +}; > >> /* Only the first slave id for a PMIC contains this information */ >> - if (sdev->usid % 2 == 0) >> - pmic_spmi_show_revid(regmap, &sdev->dev); >> + if (sdev->usid % ctx->num_usids == 0) { >> + ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic); >> + if (ret < 0) >> + return ret; >> + } >> + spmi_device_set_drvdata(sdev, ctx); >> >> return devm_of_platform_populate(&sdev->dev); >> } >> diff --git a/include/soc/qcom/qcom-spmi-pmic.h b/include/soc/qcom/qcom-spmi-pmic.h >> new file mode 100644 >> index 000000000000..5400e6509fe8 >> --- /dev/null >> +++ b/include/soc/qcom/qcom-spmi-pmic.h >> @@ -0,0 +1,60 @@ >> +/* SPDX-License-Identifier: GPL-2.0-only */ >> +/* Copyright (c) 2021 Linaro. All rights reserved. >> + * Copyright (c) 2021 Caleb Connolly <caleb.connolly@linaro.org> > > Your very own Copyright? Why? I did some research originally and couldn't find any docs on Linaro precedent here, so went with this originally... I switched over the other files when I realised that "Author:" was the preferred approach but I guess this one slipped through the crack. > > Any not Author: instead? > >> + */ >> + >> +#ifndef __QCOM_SPMI_PMIC_H__ >> +#define __QCOM_SPMI_PMIC_H__ >> + >> +#define COMMON_SUBTYPE 0x00 >> +#define PM8941_SUBTYPE 0x01 >> +#define PM8841_SUBTYPE 0x02 >> +#define PM8019_SUBTYPE 0x03 >> +#define PM8226_SUBTYPE 0x04 >> +#define PM8110_SUBTYPE 0x05 >> +#define PMA8084_SUBTYPE 0x06 >> +#define PMI8962_SUBTYPE 0x07 >> +#define PMD9635_SUBTYPE 0x08 >> +#define PM8994_SUBTYPE 0x09 >> +#define PMI8994_SUBTYPE 0x0a >> +#define PM8916_SUBTYPE 0x0b >> +#define PM8004_SUBTYPE 0x0c >> +#define PM8909_SUBTYPE 0x0d >> +#define PM8028_SUBTYPE 0x0e >> +#define PM8901_SUBTYPE 0x0f >> +#define PM8950_SUBTYPE 0x10 >> +#define PMI8950_SUBTYPE 0x11 >> +#define PM8998_SUBTYPE 0x14 >> +#define PMI8998_SUBTYPE 0x15 >> +#define PM8005_SUBTYPE 0x18 >> +#define PM660L_SUBTYPE 0x1A >> +#define PM660_SUBTYPE 0x1B >> +#define PM8150_SUBTYPE 0x1E >> +#define PM8150L_SUBTYPE 0x1f >> +#define PM8150B_SUBTYPE 0x20 >> +#define PMK8002_SUBTYPE 0x21 >> +#define PM8009_SUBTYPE 0x24 >> +#define PM8150C_SUBTYPE 0x26 >> +#define SMB2351_SUBTYPE 0x29 >> + >> +#define PMI8998_FAB_ID_SMIC 0x11 >> +#define PMI8998_FAB_ID_GF 0x30 >> + >> +#define PM660_FAB_ID_GF 0x0 >> +#define PM660_FAB_ID_TSMC 0x2 >> +#define PM660_FAB_ID_MX 0x3 >> + >> +struct qcom_spmi_pmic { >> + unsigned int type; >> + unsigned int subtype; >> + unsigned int major; >> + unsigned int minor; >> + unsigned int rev2; >> + const char *name; >> +}; >> + >> +struct device; > > Can't you just include the correct header?Sure > >> +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev); >> + >> +#endif /* __QCOM_SPMI_PMIC_H__ */ >
On Wed, 27 Apr 2022, Caleb Connolly wrote: > On 25/04/2022 16:03, Lee Jones wrote: > > > > On Wed, 23 Mar 2022, Caleb Connolly wrote: > > > From: Caleb Connolly <caleb.connolly@linaro.org> > > > > > > Some PMIC functions such as the RRADC need to be aware of the PMIC > > > chip revision information to implement errata or otherwise adjust > > > behaviour, export the PMIC information to enable this. > > > > > > This is specifically required to enable the RRADC to adjust > > > coefficients based on which chip fab the PMIC was produced in, > > > this can vary per unique device and therefore has to be read at > > > runtime. > > > > > > Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> > > > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > > > Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > > > --- > > > drivers/mfd/qcom-spmi-pmic.c | 261 +++++++++++++++++++----------- > > > include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++ > > > 2 files changed, 231 insertions(+), 90 deletions(-) > > > create mode 100644 include/soc/qcom/qcom-spmi-pmic.h [...] > > > + /* > > > + * If the base USID for this PMIC hasn't probed yet > > > + * but the secondary USID has, then we need to defer > > > + * the function driver so that it will attempt to > > > + * probe again when the base USID is ready. > > > + */ > > > + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) > > > > Double " ". > Ack > > > > Over-bracketing of statements with matching operands. > I don't think x - (y - 1) is equal to x - y - 1? Or am I misunderstanding you here? Can you give me an example when this would be the case?
On 28/04/2022 17:14, Lee Jones wrote: > On Wed, 27 Apr 2022, Caleb Connolly wrote: >> On 25/04/2022 16:03, Lee Jones wrote: >>> >>> On Wed, 23 Mar 2022, Caleb Connolly wrote: >>>> From: Caleb Connolly <caleb.connolly@linaro.org> >>>> >>>> Some PMIC functions such as the RRADC need to be aware of the PMIC >>>> chip revision information to implement errata or otherwise adjust >>>> behaviour, export the PMIC information to enable this. >>>> >>>> This is specifically required to enable the RRADC to adjust >>>> coefficients based on which chip fab the PMIC was produced in, >>>> this can vary per unique device and therefore has to be read at >>>> runtime. >>>> >>>> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> >>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >>>> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >>>> --- >>>> drivers/mfd/qcom-spmi-pmic.c | 261 +++++++++++++++++++----------- >>>> include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++ >>>> 2 files changed, 231 insertions(+), 90 deletions(-) >>>> create mode 100644 include/soc/qcom/qcom-spmi-pmic.h > > [...] > >>>> + /* >>>> + * If the base USID for this PMIC hasn't probed yet >>>> + * but the secondary USID has, then we need to defer >>>> + * the function driver so that it will attempt to >>>> + * probe again when the base USID is ready. >>>> + */ >>>> + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) >>> >>> Double " ". >> Ack >>> >>> Over-bracketing of statements with matching operands. >> I don't think x - (y - 1) is equal to x - y - 1? Or am I misunderstanding you here? > > Can you give me an example when this would be the case? According to the Python interpreter: >>> x=7 >>> y=4 >>> x - y - 1 2 >>> x - (y - 1) 4 C does also respect the first rule of BODMAS - parenthesis are always evaluated first. >
On Thu, 28 Apr 2022, Caleb Connolly wrote: > On 28/04/2022 17:14, Lee Jones wrote: > > On Wed, 27 Apr 2022, Caleb Connolly wrote: > > > On 25/04/2022 16:03, Lee Jones wrote: > > > > > > > > On Wed, 23 Mar 2022, Caleb Connolly wrote: > > > > > From: Caleb Connolly <caleb.connolly@linaro.org> > > > > > > > > > > Some PMIC functions such as the RRADC need to be aware of the PMIC > > > > > chip revision information to implement errata or otherwise adjust > > > > > behaviour, export the PMIC information to enable this. > > > > > > > > > > This is specifically required to enable the RRADC to adjust > > > > > coefficients based on which chip fab the PMIC was produced in, > > > > > this can vary per unique device and therefore has to be read at > > > > > runtime. > > > > > > > > > > Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> > > > > > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > > > > > Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > > > > > --- > > > > > drivers/mfd/qcom-spmi-pmic.c | 261 +++++++++++++++++++----------- > > > > > include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++ > > > > > 2 files changed, 231 insertions(+), 90 deletions(-) > > > > > create mode 100644 include/soc/qcom/qcom-spmi-pmic.h > > > > [...] > > > > > > > + /* > > > > > + * If the base USID for this PMIC hasn't probed yet > > > > > + * but the secondary USID has, then we need to defer > > > > > + * the function driver so that it will attempt to > > > > > + * probe again when the base USID is ready. > > > > > + */ > > > > > + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) > > > > > > > > Double " ". > > > Ack > > > > > > > > Over-bracketing of statements with matching operands. > > > I don't think x - (y - 1) is equal to x - y - 1? Or am I misunderstanding you here? > > > > Can you give me an example when this would be the case? > According to the Python interpreter: > >>> x=7 > >>> y=4 > >>> x - y - 1 > 2 > >>> x - (y - 1) > 4 > > C does also respect the first rule of BODMAS - parenthesis are always > evaluated first. Fair point, well presented. Thanks for this - I understand the problem now.
On 29/04/2022 11:06, Lee Jones wrote: > On Thu, 28 Apr 2022, Caleb Connolly wrote: >> On 28/04/2022 17:14, Lee Jones wrote: >>> On Wed, 27 Apr 2022, Caleb Connolly wrote: >>>> On 25/04/2022 16:03, Lee Jones wrote: >>>>> >>>>> On Wed, 23 Mar 2022, Caleb Connolly wrote: >>>>>> From: Caleb Connolly <caleb.connolly@linaro.org> >>>>>> >>>>>> Some PMIC functions such as the RRADC need to be aware of the PMIC >>>>>> chip revision information to implement errata or otherwise adjust >>>>>> behaviour, export the PMIC information to enable this. >>>>>> >>>>>> This is specifically required to enable the RRADC to adjust >>>>>> coefficients based on which chip fab the PMIC was produced in, >>>>>> this can vary per unique device and therefore has to be read at >>>>>> runtime. >>>>>> >>>>>> Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org> >>>>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >>>>>> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >>>>>> --- >>>>>> drivers/mfd/qcom-spmi-pmic.c | 261 +++++++++++++++++++----------- >>>>>> include/soc/qcom/qcom-spmi-pmic.h | 60 +++++++ >>>>>> 2 files changed, 231 insertions(+), 90 deletions(-) >>>>>> create mode 100644 include/soc/qcom/qcom-spmi-pmic.h >>> >>> [...] >>> >>>>>> + /* >>>>>> + * If the base USID for this PMIC hasn't probed yet >>>>>> + * but the secondary USID has, then we need to defer >>>>>> + * the function driver so that it will attempt to >>>>>> + * probe again when the base USID is ready. >>>>>> + */ >>>>>> + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) >>>>> >>>>> Double " ". >>>> Ack >>>>> >>>>> Over-bracketing of statements with matching operands. >>>> I don't think x - (y - 1) is equal to x - y - 1? Or am I misunderstanding you here? >>> >>> Can you give me an example when this would be the case? >> According to the Python interpreter: >>>>> x=7 >>>>> y=4 >>>>> x - y - 1 >> 2 >>>>> x - (y - 1) >> 4 >> >> C does also respect the first rule of BODMAS - parenthesis are always >> evaluated first. > > Fair point, well presented. > > Thanks for this - I understand the problem now. Thanks, Could you respond to my other two points in https://lore.kernel.org/linux-arm-msm/2763f103-6947-e431-cef5-e202c324d678@linaro.org/ Regarding if (!of_match_device(pmic_spmi_id_table, dev)) and ctx->num_usids = (long)of_device_get_match_data(&sdev->dev); >
diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c index 1cacc00aa6c9..d8e54d9d3448 100644 --- a/drivers/mfd/qcom-spmi-pmic.c +++ b/drivers/mfd/qcom-spmi-pmic.c @@ -3,11 +3,16 @@ * Copyright (c) 2014, The Linux Foundation. All rights reserved. */ +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/gfp.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/spmi.h> +#include <linux/types.h> #include <linux/regmap.h> #include <linux/of_platform.h> +#include <soc/qcom/qcom-spmi-pmic.h> #define PMIC_REV2 0x101 #define PMIC_REV3 0x102 @@ -17,106 +22,151 @@ #define PMIC_TYPE_VALUE 0x51 -#define COMMON_SUBTYPE 0x00 -#define PM8941_SUBTYPE 0x01 -#define PM8841_SUBTYPE 0x02 -#define PM8019_SUBTYPE 0x03 -#define PM8226_SUBTYPE 0x04 -#define PM8110_SUBTYPE 0x05 -#define PMA8084_SUBTYPE 0x06 -#define PMI8962_SUBTYPE 0x07 -#define PMD9635_SUBTYPE 0x08 -#define PM8994_SUBTYPE 0x09 -#define PMI8994_SUBTYPE 0x0a -#define PM8916_SUBTYPE 0x0b -#define PM8004_SUBTYPE 0x0c -#define PM8909_SUBTYPE 0x0d -#define PM8028_SUBTYPE 0x0e -#define PM8901_SUBTYPE 0x0f -#define PM8950_SUBTYPE 0x10 -#define PMI8950_SUBTYPE 0x11 -#define PM8998_SUBTYPE 0x14 -#define PMI8998_SUBTYPE 0x15 -#define PM8005_SUBTYPE 0x18 -#define PM660L_SUBTYPE 0x1A -#define PM660_SUBTYPE 0x1B -#define PM8150_SUBTYPE 0x1E -#define PM8150L_SUBTYPE 0x1f -#define PM8150B_SUBTYPE 0x20 -#define PMK8002_SUBTYPE 0x21 -#define PM8009_SUBTYPE 0x24 -#define PM8150C_SUBTYPE 0x26 -#define SMB2351_SUBTYPE 0x29 +struct qcom_spmi_dev { + int num_usids; + struct qcom_spmi_pmic pmic; +}; + +#define N_USIDS(n) ((void *)n) static const struct of_device_id pmic_spmi_id_table[] = { - { .compatible = "qcom,pm660", .data = (void *)PM660_SUBTYPE }, - { .compatible = "qcom,pm660l", .data = (void *)PM660L_SUBTYPE }, - { .compatible = "qcom,pm8004", .data = (void *)PM8004_SUBTYPE }, - { .compatible = "qcom,pm8005", .data = (void *)PM8005_SUBTYPE }, - { .compatible = "qcom,pm8019", .data = (void *)PM8019_SUBTYPE }, - { .compatible = "qcom,pm8028", .data = (void *)PM8028_SUBTYPE }, - { .compatible = "qcom,pm8110", .data = (void *)PM8110_SUBTYPE }, - { .compatible = "qcom,pm8150", .data = (void *)PM8150_SUBTYPE }, - { .compatible = "qcom,pm8150b", .data = (void *)PM8150B_SUBTYPE }, - { .compatible = "qcom,pm8150c", .data = (void *)PM8150C_SUBTYPE }, - { .compatible = "qcom,pm8150l", .data = (void *)PM8150L_SUBTYPE }, - { .compatible = "qcom,pm8226", .data = (void *)PM8226_SUBTYPE }, - { .compatible = "qcom,pm8841", .data = (void *)PM8841_SUBTYPE }, - { .compatible = "qcom,pm8901", .data = (void *)PM8901_SUBTYPE }, - { .compatible = "qcom,pm8909", .data = (void *)PM8909_SUBTYPE }, - { .compatible = "qcom,pm8916", .data = (void *)PM8916_SUBTYPE }, - { .compatible = "qcom,pm8941", .data = (void *)PM8941_SUBTYPE }, - { .compatible = "qcom,pm8950", .data = (void *)PM8950_SUBTYPE }, - { .compatible = "qcom,pm8994", .data = (void *)PM8994_SUBTYPE }, - { .compatible = "qcom,pm8998", .data = (void *)PM8998_SUBTYPE }, - { .compatible = "qcom,pma8084", .data = (void *)PMA8084_SUBTYPE }, - { .compatible = "qcom,pmd9635", .data = (void *)PMD9635_SUBTYPE }, - { .compatible = "qcom,pmi8950", .data = (void *)PMI8950_SUBTYPE }, - { .compatible = "qcom,pmi8962", .data = (void *)PMI8962_SUBTYPE }, - { .compatible = "qcom,pmi8994", .data = (void *)PMI8994_SUBTYPE }, - { .compatible = "qcom,pmi8998", .data = (void *)PMI8998_SUBTYPE }, - { .compatible = "qcom,pmk8002", .data = (void *)PMK8002_SUBTYPE }, - { .compatible = "qcom,smb2351", .data = (void *)SMB2351_SUBTYPE }, - { .compatible = "qcom,spmi-pmic", .data = (void *)COMMON_SUBTYPE }, + { .compatible = "qcom,pm660", .data = N_USIDS(2) }, + { .compatible = "qcom,pm660l", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8004", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8005", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8019", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8028", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8110", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150b", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150c", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8150l", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8226", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8841", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8901", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8909", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8916", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8941", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8950", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8994", .data = N_USIDS(2) }, + { .compatible = "qcom,pm8998", .data = N_USIDS(2) }, + { .compatible = "qcom,pma8084", .data = N_USIDS(2) }, + { .compatible = "qcom,pmd9635", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8950", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8962", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8994", .data = N_USIDS(2) }, + { .compatible = "qcom,pmi8998", .data = N_USIDS(2) }, + { .compatible = "qcom,pmk8002", .data = N_USIDS(2) }, + { .compatible = "qcom,smb2351", .data = N_USIDS(2) }, + { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) }, { } }; -static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) +#undef N_USIDS + +/* + * A PMIC can be represented by multiple SPMI devices, but + * only the base PMIC device will contain a reference to + * the revision information. + * + * This function takes a pointer to a function device and + * returns a pointer to the base PMIC device. + * + * This only supports PMICs with 1 or 2 USIDs. + */ +static struct spmi_device *qcom_pmic_get_base_usid(struct device *dev) { - unsigned int rev2, minor, major, type, subtype; - const char *name = "unknown"; - int ret, i; + struct spmi_device *sdev; + struct qcom_spmi_dev *ctx; + struct device_node *spmi_bus; + struct device_node *other_usid = NULL; + int function_parent_usid, ret; + u32 pmic_addr; - ret = regmap_read(map, PMIC_TYPE, &type); - if (ret < 0) - return; + if (!of_match_device(pmic_spmi_id_table, dev)) + return ERR_PTR(-EINVAL); + + sdev = to_spmi_device(dev); + ctx = spmi_device_get_drvdata(sdev); + + /* + * Quick return if the function device is already in the base + * USID. This will always be hit for PMICs with only 1 USID. + */ + if (sdev->usid % ctx->num_usids == 0) + return sdev; + + function_parent_usid = sdev->usid; + + /* + * Walk through the list of PMICs until we find the sibling USID. + * The goal is to find the first USID which is less than the + * number of USIDs in the PMIC away, e.g. for a PMIC with 2 USIDs + * where the function device is under USID 3, we want to find the + * device for USID 2. + */ + spmi_bus = of_get_parent(sdev->dev.of_node); + do { + other_usid = of_get_next_child(spmi_bus, other_usid); + ret = of_property_read_u32_index(other_usid, "reg", 0, &pmic_addr); + if (ret) + return ERR_PTR(ret); + sdev = spmi_device_from_of(other_usid); + if (sdev == NULL) { + /* + * If the base USID for this PMIC hasn't probed yet + * but the secondary USID has, then we need to defer + * the function driver so that it will attempt to + * probe again when the base USID is ready. + */ + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) + return ERR_PTR(-EPROBE_DEFER); + + continue; + } + + if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) + return sdev; + } while (other_usid->sibling); + + return ERR_PTR(-ENODATA); +} + +static inline void pmic_print_info(struct device *dev, struct qcom_spmi_pmic *pmic) +{ + dev_dbg(dev, "%x: %s v%d.%d\n", + pmic->subtype, pmic->name, pmic->major, pmic->minor); +} - if (type != PMIC_TYPE_VALUE) - return; +static int pmic_spmi_load_revid(struct regmap *map, struct device *dev, + struct qcom_spmi_pmic *pmic) +{ + int ret; - ret = regmap_read(map, PMIC_SUBTYPE, &subtype); + ret = regmap_read(map, PMIC_TYPE, &pmic->type); if (ret < 0) - return; + return ret; - for (i = 0; i < ARRAY_SIZE(pmic_spmi_id_table); i++) { - if (subtype == (unsigned long)pmic_spmi_id_table[i].data) - break; - } + if (pmic->type != PMIC_TYPE_VALUE) + return ret; - if (i != ARRAY_SIZE(pmic_spmi_id_table)) - name = pmic_spmi_id_table[i].compatible; + ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype); + if (ret < 0) + return ret; + + pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible; - ret = regmap_read(map, PMIC_REV2, &rev2); + ret = regmap_read(map, PMIC_REV2, &pmic->rev2); if (ret < 0) - return; + return ret; - ret = regmap_read(map, PMIC_REV3, &minor); + ret = regmap_read(map, PMIC_REV3, &pmic->minor); if (ret < 0) - return; + return ret; - ret = regmap_read(map, PMIC_REV4, &major); + ret = regmap_read(map, PMIC_REV4, &pmic->major); if (ret < 0) - return; + return ret; /* * In early versions of PM8941 and PM8226, the major revision number @@ -124,15 +174,34 @@ static void pmic_spmi_show_revid(struct regmap *map, struct device *dev) * Increment the major revision number here if the chip is an early * version of PM8941 or PM8226. */ - if ((subtype == PM8941_SUBTYPE || subtype == PM8226_SUBTYPE) && - major < 0x02) - major++; + if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) && + pmic->major < 0x02) + pmic->major++; + + if (pmic->subtype == PM8110_SUBTYPE) + pmic->minor = pmic->rev2; + + pmic_print_info(dev, pmic); - if (subtype == PM8110_SUBTYPE) - minor = rev2; + return 0; +} + +/** + * qcom_pmic_get() - Get a pointer to the base PMIC device + * + * @dev: the pmic function device + * @return: the struct qcom_spmi_pmic* pointer associated with the function device + */ +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev) +{ + struct spmi_device *sdev = qcom_pmic_get_base_usid(dev->parent); - dev_dbg(dev, "%x: %s v%d.%d\n", subtype, name, major, minor); + if (IS_ERR(sdev)) + return ERR_CAST(sdev); + + return &((struct qcom_spmi_dev *)spmi_device_get_drvdata(sdev))->pmic; } +EXPORT_SYMBOL(qcom_pmic_get); static const struct regmap_config spmi_regmap_config = { .reg_bits = 16, @@ -144,14 +213,26 @@ static const struct regmap_config spmi_regmap_config = { static int pmic_spmi_probe(struct spmi_device *sdev) { struct regmap *regmap; + struct qcom_spmi_dev *ctx; + int ret; regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config); if (IS_ERR(regmap)) return PTR_ERR(regmap); + ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->num_usids = (long)of_device_get_match_data(&sdev->dev); + /* Only the first slave id for a PMIC contains this information */ - if (sdev->usid % 2 == 0) - pmic_spmi_show_revid(regmap, &sdev->dev); + if (sdev->usid % ctx->num_usids == 0) { + ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic); + if (ret < 0) + return ret; + } + spmi_device_set_drvdata(sdev, ctx); return devm_of_platform_populate(&sdev->dev); } diff --git a/include/soc/qcom/qcom-spmi-pmic.h b/include/soc/qcom/qcom-spmi-pmic.h new file mode 100644 index 000000000000..5400e6509fe8 --- /dev/null +++ b/include/soc/qcom/qcom-spmi-pmic.h @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* Copyright (c) 2021 Linaro. All rights reserved. + * Copyright (c) 2021 Caleb Connolly <caleb.connolly@linaro.org> + */ + +#ifndef __QCOM_SPMI_PMIC_H__ +#define __QCOM_SPMI_PMIC_H__ + +#define COMMON_SUBTYPE 0x00 +#define PM8941_SUBTYPE 0x01 +#define PM8841_SUBTYPE 0x02 +#define PM8019_SUBTYPE 0x03 +#define PM8226_SUBTYPE 0x04 +#define PM8110_SUBTYPE 0x05 +#define PMA8084_SUBTYPE 0x06 +#define PMI8962_SUBTYPE 0x07 +#define PMD9635_SUBTYPE 0x08 +#define PM8994_SUBTYPE 0x09 +#define PMI8994_SUBTYPE 0x0a +#define PM8916_SUBTYPE 0x0b +#define PM8004_SUBTYPE 0x0c +#define PM8909_SUBTYPE 0x0d +#define PM8028_SUBTYPE 0x0e +#define PM8901_SUBTYPE 0x0f +#define PM8950_SUBTYPE 0x10 +#define PMI8950_SUBTYPE 0x11 +#define PM8998_SUBTYPE 0x14 +#define PMI8998_SUBTYPE 0x15 +#define PM8005_SUBTYPE 0x18 +#define PM660L_SUBTYPE 0x1A +#define PM660_SUBTYPE 0x1B +#define PM8150_SUBTYPE 0x1E +#define PM8150L_SUBTYPE 0x1f +#define PM8150B_SUBTYPE 0x20 +#define PMK8002_SUBTYPE 0x21 +#define PM8009_SUBTYPE 0x24 +#define PM8150C_SUBTYPE 0x26 +#define SMB2351_SUBTYPE 0x29 + +#define PMI8998_FAB_ID_SMIC 0x11 +#define PMI8998_FAB_ID_GF 0x30 + +#define PM660_FAB_ID_GF 0x0 +#define PM660_FAB_ID_TSMC 0x2 +#define PM660_FAB_ID_MX 0x3 + +struct qcom_spmi_pmic { + unsigned int type; + unsigned int subtype; + unsigned int major; + unsigned int minor; + unsigned int rev2; + const char *name; +}; + +struct device; + +inline const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev); + +#endif /* __QCOM_SPMI_PMIC_H__ */