| Message ID | 20240517-a2b-v1-8-7e776c784e02@bang-olufsen.dk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Analog Devices Inc. Automotive Audio Bus (A2B) support | expand |
Please ignore this patch. b4 broke down half way through sending the series due to an error from my mail server. I have fixed things up and the full series can be viewed here: https://lore.kernel.org/all/20240517-a2b-v1-0-b8647554c67b@bang-olufsen.dk/#t Message-Id: <20240517-a2b-v1-0-b8647554c67b@bang-olufsen.dk> Thank you. On Fri, May 17, 2024 at 03:02:15PM GMT, Alvin Šipraga wrote: > From: Alvin Šipraga <alsi@bang-olufsen.dk> > > Analog Devices Inc. AD24xx series A2B transceivers support muxing IO > pins to a CLKOUT function. The clock supports division of the internal > PLL of the transceiver. > > Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk> > --- > drivers/a2b/Kconfig | 1 + > drivers/clk/Kconfig | 7 + > drivers/clk/Makefile | 1 + > drivers/clk/clk-ad24xx.c | 341 +++++++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 350 insertions(+) > > diff --git a/drivers/a2b/Kconfig b/drivers/a2b/Kconfig > index 6ba5dc11c51d..08acf5728023 100644 > --- a/drivers/a2b/Kconfig > +++ b/drivers/a2b/Kconfig > @@ -35,6 +35,7 @@ config A2B_AD24XX_NODE > select REGMAP_A2B > imply GPIO_AD24XX > imply SND_SOC_AD24XX > + imply COMMON_CLK_AD24XX > help > Say Y here to enable support for AD24xx A2B transceiver nodes. This > applies to both main nodes and subordinate nodes. Supported models > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig > index 3e9099504fad..a3d54b077e68 100644 > --- a/drivers/clk/Kconfig > +++ b/drivers/clk/Kconfig > @@ -257,6 +257,13 @@ config COMMON_CLK_LAN966X > LAN966X SoC. GCK generates and supplies clock to various peripherals > within the SoC. > > +config COMMON_CLK_AD24XX > + bool "Clock driver for Analog Devices Inc. AD24xx" > + depends on A2B_AD24XX_NODE > + help > + This driver supports the clock output functionality of AD24xx series > + A2B transceiver chips. > + > config COMMON_CLK_ASPEED > bool "Clock driver for Aspeed BMC SoCs" > depends on ARCH_ASPEED || COMPILE_TEST > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile > index 4abe16c8ccdf..cf5c867bf71a 100644 > --- a/drivers/clk/Makefile > +++ b/drivers/clk/Makefile > @@ -36,6 +36,7 @@ obj-$(CONFIG_COMMON_CLK_FIXED_MMIO) += clk-fixed-mmio.o > obj-$(CONFIG_COMMON_CLK_FSL_FLEXSPI) += clk-fsl-flexspi.o > obj-$(CONFIG_COMMON_CLK_FSL_SAI) += clk-fsl-sai.o > obj-$(CONFIG_COMMON_CLK_GEMINI) += clk-gemini.o > +obj-$(CONFIG_COMMON_CLK_AD24XX) += clk-ad24xx.o > obj-$(CONFIG_COMMON_CLK_ASPEED) += clk-aspeed.o > obj-$(CONFIG_MACH_ASPEED_G6) += clk-ast2600.o > obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o > diff --git a/drivers/clk/clk-ad24xx.c b/drivers/clk/clk-ad24xx.c > new file mode 100644 > index 000000000000..ed227c317faa > --- /dev/null > +++ b/drivers/clk/clk-ad24xx.c > @@ -0,0 +1,341 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * AD24xx clock driver > + * > + * Copyright (c) 2023 Alvin Šipraga <alsi@bang-olufsen.dk> > + */ > + > +#include <linux/a2b/a2b.h> > +#include <linux/a2b/ad24xx.h> > +#include <linux/clk-provider.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > + > +#define AD24XX_NUM_CLKS 2 > + > +/* Define some safe macros to make the code more readable */ > +#define A2B_CLKCFG(_idx) (!(_idx) ? A2B_CLK1CFG : A2B_CLK2CFG) > + > +#define A2B_CLKCFG_DIV_SHIFT A2B_CLK1CFG_CLK1DIV_SHIFT > +#define A2B_CLKCFG_PDIV_SHIFT A2B_CLK1CFG_CLK1PDIV_SHIFT > + > +#define A2B_CLKCFG_DIV_MASK A2B_CLK1CFG_CLK1DIV_MASK > +#define A2B_CLKCFG_PDIV_MASK A2B_CLK1CFG_CLK1PDIV_MASK > +#define A2B_CLKCFG_INV_MASK A2B_CLK1CFG_CLK1INV_MASK > +#define A2B_CLKCFG_EN_MASK A2B_CLK1CFG_CLK1EN_MASK > + > +static_assert(A2B_CLK1CFG_CLK1DIV_MASK == A2B_CLK2CFG_CLK2DIV_MASK); > +static_assert(A2B_CLK1CFG_CLK1PDIV_MASK == A2B_CLK2CFG_CLK2PDIV_MASK); > +static_assert(A2B_CLK1CFG_CLK1INV_MASK == A2B_CLK2CFG_CLK2INV_MASK); > +static_assert(A2B_CLK1CFG_CLK1EN_MASK == A2B_CLK2CFG_CLK2EN_MASK); > + > +struct ad24xx_clkout { > + struct clk_hw hw; > + unsigned int idx; > + bool registered; > +}; > + > +struct ad24xx_clk { > + struct device *dev; > + struct a2b_func *func; > + struct a2b_node *node; > + struct regmap *regmap; > + struct clk_hw *pll_hw; > + struct ad24xx_clkout clkouts[AD24XX_NUM_CLKS]; > +}; > + > +static struct ad24xx_clkout *to_ad24xx_clkout(struct clk_hw *hw) > +{ > + return container_of(hw, struct ad24xx_clkout, hw); > +} > + > +static struct ad24xx_clk *to_ad24xx_clk(struct ad24xx_clkout *clkout) > +{ > + return container_of(clkout, struct ad24xx_clk, clkouts[clkout->idx]); > +} > + > +/* > + * A CLKOUT signal is derived from the PLL frequency (2048 * SFF), going through > + * a pre-divide step and a divide step. > + * > + * The pre-divide is either 2 or 32. The divisor is between 1 and 16. > + * > + * The pre-divide register PDIV is 1 bit and selects between 2 (0) or 32 (1). > + * The divide register DIV is 4 bit and the resultant divisor is 2 * (DIV + 1). > + */ > + > +#define VAL(_pdiv, _div) \ > + (((_pdiv) << A2B_CLKCFG_PDIV_SHIFT) | ((_div) << A2B_CLKCFG_DIV_SHIFT)) > +#define DIV(_div) (2 * ((_div) + 1)) > + > +/* In total there are 6 bits to the value, with the 4th bit going unused */ > +#define AD24XX_CLK_DIV_WIDTH 6 > +static const struct clk_div_table ad24xx_clk_div_table[] = { > + { VAL(0, 0), 2 * DIV(0) }, { VAL(0, 1), 2 * DIV(1) }, > + { VAL(0, 2), 2 * DIV(2) }, { VAL(0, 3), 2 * DIV(3) }, > + { VAL(0, 4), 2 * DIV(4) }, { VAL(0, 5), 2 * DIV(5) }, > + { VAL(0, 6), 2 * DIV(6) }, { VAL(0, 7), 2 * DIV(7) }, > + { VAL(0, 8), 2 * DIV(8) }, { VAL(0, 9), 2 * DIV(9) }, > + { VAL(0, 10), 2 * DIV(10) }, { VAL(0, 11), 2 * DIV(11) }, > + { VAL(0, 12), 2 * DIV(12) }, { VAL(0, 13), 2 * DIV(13) }, > + { VAL(0, 14), 2 * DIV(14) }, { VAL(0, 15), 2 * DIV(15) }, > + { VAL(1, 0), 32 * DIV(0) }, { VAL(1, 1), 32 * DIV(1) }, > + { VAL(1, 2), 32 * DIV(2) }, { VAL(1, 3), 32 * DIV(3) }, > + { VAL(1, 4), 32 * DIV(4) }, { VAL(1, 5), 32 * DIV(5) }, > + { VAL(1, 6), 32 * DIV(6) }, { VAL(1, 7), 32 * DIV(7) }, > + { VAL(1, 8), 32 * DIV(8) }, { VAL(1, 9), 32 * DIV(9) }, > + { VAL(1, 10), 32 * DIV(10) }, { VAL(1, 11), 32 * DIV(11) }, > + { VAL(1, 12), 32 * DIV(12) }, { VAL(1, 13), 32 * DIV(13) }, > + { VAL(1, 14), 32 * DIV(14) }, { VAL(1, 15), 32 * DIV(15) }, > + { /* sentinel */ } > +}; > + > +static int ad24xx_clk_prepare(struct clk_hw *hw) > +{ > + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); > + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); > + unsigned int idx = clkout->idx; > + > + return regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), > + A2B_CLKCFG_EN_MASK, > + FIELD_PREP(A2B_CLKCFG_EN_MASK, 1)); > +} > + > +static void ad24xx_clk_unprepare(struct clk_hw *hw) > +{ > + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); > + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); > + unsigned int idx = clkout->idx; > + > + regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), A2B_CLKCFG_EN_MASK, > + FIELD_PREP(A2B_CLKCFG_EN_MASK, 0)); > +} > + > +static unsigned long ad24xx_clk_recalc_rate(struct clk_hw *hw, > + unsigned long parent_rate) > +{ > + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); > + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); > + unsigned int idx = clkout->idx; > + unsigned int val; > + int ret; > + > + ret = regmap_read(adclk->regmap, A2B_CLKCFG(idx), &val); > + if (ret) > + return 0; > + > + val &= A2B_CLKCFG_PDIV_MASK | A2B_CLKCFG_DIV_MASK; > + > + return divider_recalc_rate(hw, parent_rate, val, ad24xx_clk_div_table, > + 0, AD24XX_CLK_DIV_WIDTH); > +} > + > +static long ad24xx_clk_round_rate(struct clk_hw *hw, unsigned long rate, > + unsigned long *parent_rate) > +{ > + return divider_round_rate(hw, rate, parent_rate, ad24xx_clk_div_table, > + AD24XX_CLK_DIV_WIDTH, 0); > +} > + > +static int ad24xx_clk_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) > +{ > + return divider_determine_rate(hw, req, ad24xx_clk_div_table, > + AD24XX_CLK_DIV_WIDTH, 0); > +} > + > +static int ad24xx_clk_set_rate(struct clk_hw *hw, unsigned long rate, > + unsigned long parent_rate) > +{ > + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); > + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); > + unsigned int idx = clkout->idx; > + int val; > + > + val = divider_get_val(rate, parent_rate, ad24xx_clk_div_table, > + AD24XX_CLK_DIV_WIDTH, 0); > + if (val < 0) > + return val; > + > + return regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), > + A2B_CLKCFG_PDIV_MASK | A2B_CLKCFG_DIV_MASK, > + val); > +} > + > +static int ad24xx_clk_get_phase(struct clk_hw *hw) > +{ > + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); > + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); > + unsigned int idx = clkout->idx; > + unsigned int val; > + bool invert; > + int ret; > + > + ret = regmap_read(adclk->regmap, A2B_CLKCFG(idx), &val); > + if (ret) > + return ret; > + > + invert = FIELD_GET(A2B_CLKCFG_INV_MASK, val); > + > + return invert ? 180 : 0; > +} > + > +static int ad24xx_clk_set_phase(struct clk_hw *hw, int degrees) > +{ > + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); > + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); > + unsigned int idx = clkout->idx; > + bool invert = !!degrees; > + > + if (degrees != 0 && degrees != 180) > + return -EINVAL; > + > + return regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), > + A2B_CLKCFG_INV_MASK, > + FIELD_PREP(A2B_CLKCFG_INV_MASK, invert)); > +} > + > +static const struct clk_ops ad24xx_clk_ops = { > + .prepare = ad24xx_clk_prepare, > + .unprepare = ad24xx_clk_unprepare, > + .recalc_rate = ad24xx_clk_recalc_rate, > + .round_rate = ad24xx_clk_round_rate, > + .determine_rate = ad24xx_clk_determine_rate, > + .set_rate = ad24xx_clk_set_rate, > + .get_phase = ad24xx_clk_get_phase, > + .set_phase = ad24xx_clk_set_phase, > +}; > + > +static const struct regmap_config ad24xx_clk_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > + .cache_type = REGCACHE_RBTREE, > +}; > + > +static struct clk_hw *ad24xx_clk_of_get(struct of_phandle_args *clkspec, void *data) > +{ > + struct ad24xx_clk *adclk = data; > + unsigned int idx = clkspec->args[0]; > + > + if (idx >= AD24XX_NUM_CLKS) > + return ERR_PTR(-EINVAL); > + > + if (!adclk->clkouts[idx].registered) > + return ERR_PTR(-ENOENT); > + > + return &adclk->clkouts[idx].hw; > +} > + > +static int ad24xx_clk_probe(struct device *dev) > +{ > + struct a2b_func *func = to_a2b_func(dev); > + struct a2b_node *node = func->node; > + struct device_node *np = dev->of_node; > + char *pll_name; > + const char *sync_clk_name; > + struct ad24xx_clk *adclk; > + int num_clks; > + int ret; > + int i; > + > + /* > + * Older series AD240x and AD241x chips have a single discrete > + * A2B_CLKCFG register that behaves differently to the A2B_CLKnCFG > + * registers of the later AD242x series. This driver only supports the > + * latter right now. > + */ > + if (!(node->chip_info->caps & A2B_CHIP_CAP_CLKOUT)) > + return -ENODEV; > + > + adclk = devm_kzalloc(dev, sizeof(*adclk), GFP_KERNEL); > + if (!adclk) > + return -ENOMEM; > + > + adclk->regmap = > + devm_regmap_init_a2b_func(func, &ad24xx_clk_regmap_config); > + if (IS_ERR(adclk->regmap)) > + return PTR_ERR(adclk->regmap); > + > + adclk->dev = dev; > + adclk->func = func; > + adclk->node = node; > + dev_set_drvdata(dev, adclk); > + > + num_clks = of_property_count_strings(np, "clock-output-names"); > + if (num_clks < 0 || num_clks > AD24XX_NUM_CLKS) > + return -EINVAL; > + > + /* > + * Register the PLL internally to use it as the parent of the CLKOUTs. > + * The PLL runs at 2048 times the SYNC clock rate. > + */ > + pll_name = > + devm_kasprintf(dev, GFP_KERNEL, "%s_pll", dev_name(&node->dev)); > + if (!pll_name) > + return -ENOMEM; > + sync_clk_name = __clk_get_name(a2b_node_get_sync_clk(func->node)); > + adclk->pll_hw = devm_clk_hw_register_fixed_factor( > + dev, pll_name, sync_clk_name, 0, 2048, 1); > + if (IS_ERR(adclk->pll_hw)) > + return PTR_ERR(adclk->pll_hw); > + > + for (i = 0; i < num_clks; i++) { > + struct clk_init_data init = { }; > + const char *parent_names = clk_hw_get_name(adclk->pll_hw); > + unsigned int idx = i; > + > + /* Clock outputs can be skipped with the clock-indices property */ > + of_property_read_u32_index(np, "clock-indices", i, &idx); > + if (idx > AD24XX_NUM_CLKS) > + return -EINVAL; > + > + ret = of_property_read_string_index(np, "clock-output-names", i, > + &init.name); > + if (ret) > + return ret; > + > + init.ops = &ad24xx_clk_ops; > + init.parent_names = &parent_names; > + init.num_parents = 1; > + > + adclk->clkouts[idx].hw.init = &init; > + adclk->clkouts[idx].idx = idx; > + adclk->clkouts[idx].registered = true; > + > + ret = devm_clk_hw_register(dev, &adclk->clkouts[idx].hw); > + if (ret) > + return ret; > + } > + > + ret = devm_of_clk_add_hw_provider(dev, ad24xx_clk_of_get, adclk); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static const struct of_device_id ad24xx_clk_of_match_table[] = { > + { .compatible = "adi,ad2420-clk" }, > + { .compatible = "adi,ad2421-clk" }, > + { .compatible = "adi,ad2422-clk" }, > + { .compatible = "adi,ad2425-clk" }, > + { .compatible = "adi,ad2426-clk" }, > + { .compatible = "adi,ad2427-clk" }, > + { .compatible = "adi,ad2428-clk" }, > + { .compatible = "adi,ad2429-clk" }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, ad24xx_clk_of_match_table); > + > +static struct a2b_driver ad24xx_clk_driver = { > + .driver = { > + .name = "ad24xx-clk", > + .of_match_table = ad24xx_clk_of_match_table, > + .probe_type = PROBE_PREFER_ASYNCHRONOUS, > + }, > + .probe = ad24xx_clk_probe, > +}; > +module_a2b_driver(ad24xx_clk_driver); > + > +MODULE_AUTHOR("Alvin Šipraga <alsi@bang-olufsen.dk>"); > +MODULE_DESCRIPTION("AD24xx CLK driver"); > +MODULE_LICENSE("GPL"); > > -- > 2.44.0 >
diff --git a/drivers/a2b/Kconfig b/drivers/a2b/Kconfig index 6ba5dc11c51d..08acf5728023 100644 --- a/drivers/a2b/Kconfig +++ b/drivers/a2b/Kconfig @@ -35,6 +35,7 @@ config A2B_AD24XX_NODE select REGMAP_A2B imply GPIO_AD24XX imply SND_SOC_AD24XX + imply COMMON_CLK_AD24XX help Say Y here to enable support for AD24xx A2B transceiver nodes. This applies to both main nodes and subordinate nodes. Supported models diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 3e9099504fad..a3d54b077e68 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -257,6 +257,13 @@ config COMMON_CLK_LAN966X LAN966X SoC. GCK generates and supplies clock to various peripherals within the SoC. +config COMMON_CLK_AD24XX + bool "Clock driver for Analog Devices Inc. AD24xx" + depends on A2B_AD24XX_NODE + help + This driver supports the clock output functionality of AD24xx series + A2B transceiver chips. + config COMMON_CLK_ASPEED bool "Clock driver for Aspeed BMC SoCs" depends on ARCH_ASPEED || COMPILE_TEST diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 4abe16c8ccdf..cf5c867bf71a 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -36,6 +36,7 @@ obj-$(CONFIG_COMMON_CLK_FIXED_MMIO) += clk-fixed-mmio.o obj-$(CONFIG_COMMON_CLK_FSL_FLEXSPI) += clk-fsl-flexspi.o obj-$(CONFIG_COMMON_CLK_FSL_SAI) += clk-fsl-sai.o obj-$(CONFIG_COMMON_CLK_GEMINI) += clk-gemini.o +obj-$(CONFIG_COMMON_CLK_AD24XX) += clk-ad24xx.o obj-$(CONFIG_COMMON_CLK_ASPEED) += clk-aspeed.o obj-$(CONFIG_MACH_ASPEED_G6) += clk-ast2600.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o diff --git a/drivers/clk/clk-ad24xx.c b/drivers/clk/clk-ad24xx.c new file mode 100644 index 000000000000..ed227c317faa --- /dev/null +++ b/drivers/clk/clk-ad24xx.c @@ -0,0 +1,341 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * AD24xx clock driver + * + * Copyright (c) 2023 Alvin Šipraga <alsi@bang-olufsen.dk> + */ + +#include <linux/a2b/a2b.h> +#include <linux/a2b/ad24xx.h> +#include <linux/clk-provider.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#define AD24XX_NUM_CLKS 2 + +/* Define some safe macros to make the code more readable */ +#define A2B_CLKCFG(_idx) (!(_idx) ? A2B_CLK1CFG : A2B_CLK2CFG) + +#define A2B_CLKCFG_DIV_SHIFT A2B_CLK1CFG_CLK1DIV_SHIFT +#define A2B_CLKCFG_PDIV_SHIFT A2B_CLK1CFG_CLK1PDIV_SHIFT + +#define A2B_CLKCFG_DIV_MASK A2B_CLK1CFG_CLK1DIV_MASK +#define A2B_CLKCFG_PDIV_MASK A2B_CLK1CFG_CLK1PDIV_MASK +#define A2B_CLKCFG_INV_MASK A2B_CLK1CFG_CLK1INV_MASK +#define A2B_CLKCFG_EN_MASK A2B_CLK1CFG_CLK1EN_MASK + +static_assert(A2B_CLK1CFG_CLK1DIV_MASK == A2B_CLK2CFG_CLK2DIV_MASK); +static_assert(A2B_CLK1CFG_CLK1PDIV_MASK == A2B_CLK2CFG_CLK2PDIV_MASK); +static_assert(A2B_CLK1CFG_CLK1INV_MASK == A2B_CLK2CFG_CLK2INV_MASK); +static_assert(A2B_CLK1CFG_CLK1EN_MASK == A2B_CLK2CFG_CLK2EN_MASK); + +struct ad24xx_clkout { + struct clk_hw hw; + unsigned int idx; + bool registered; +}; + +struct ad24xx_clk { + struct device *dev; + struct a2b_func *func; + struct a2b_node *node; + struct regmap *regmap; + struct clk_hw *pll_hw; + struct ad24xx_clkout clkouts[AD24XX_NUM_CLKS]; +}; + +static struct ad24xx_clkout *to_ad24xx_clkout(struct clk_hw *hw) +{ + return container_of(hw, struct ad24xx_clkout, hw); +} + +static struct ad24xx_clk *to_ad24xx_clk(struct ad24xx_clkout *clkout) +{ + return container_of(clkout, struct ad24xx_clk, clkouts[clkout->idx]); +} + +/* + * A CLKOUT signal is derived from the PLL frequency (2048 * SFF), going through + * a pre-divide step and a divide step. + * + * The pre-divide is either 2 or 32. The divisor is between 1 and 16. + * + * The pre-divide register PDIV is 1 bit and selects between 2 (0) or 32 (1). + * The divide register DIV is 4 bit and the resultant divisor is 2 * (DIV + 1). + */ + +#define VAL(_pdiv, _div) \ + (((_pdiv) << A2B_CLKCFG_PDIV_SHIFT) | ((_div) << A2B_CLKCFG_DIV_SHIFT)) +#define DIV(_div) (2 * ((_div) + 1)) + +/* In total there are 6 bits to the value, with the 4th bit going unused */ +#define AD24XX_CLK_DIV_WIDTH 6 +static const struct clk_div_table ad24xx_clk_div_table[] = { + { VAL(0, 0), 2 * DIV(0) }, { VAL(0, 1), 2 * DIV(1) }, + { VAL(0, 2), 2 * DIV(2) }, { VAL(0, 3), 2 * DIV(3) }, + { VAL(0, 4), 2 * DIV(4) }, { VAL(0, 5), 2 * DIV(5) }, + { VAL(0, 6), 2 * DIV(6) }, { VAL(0, 7), 2 * DIV(7) }, + { VAL(0, 8), 2 * DIV(8) }, { VAL(0, 9), 2 * DIV(9) }, + { VAL(0, 10), 2 * DIV(10) }, { VAL(0, 11), 2 * DIV(11) }, + { VAL(0, 12), 2 * DIV(12) }, { VAL(0, 13), 2 * DIV(13) }, + { VAL(0, 14), 2 * DIV(14) }, { VAL(0, 15), 2 * DIV(15) }, + { VAL(1, 0), 32 * DIV(0) }, { VAL(1, 1), 32 * DIV(1) }, + { VAL(1, 2), 32 * DIV(2) }, { VAL(1, 3), 32 * DIV(3) }, + { VAL(1, 4), 32 * DIV(4) }, { VAL(1, 5), 32 * DIV(5) }, + { VAL(1, 6), 32 * DIV(6) }, { VAL(1, 7), 32 * DIV(7) }, + { VAL(1, 8), 32 * DIV(8) }, { VAL(1, 9), 32 * DIV(9) }, + { VAL(1, 10), 32 * DIV(10) }, { VAL(1, 11), 32 * DIV(11) }, + { VAL(1, 12), 32 * DIV(12) }, { VAL(1, 13), 32 * DIV(13) }, + { VAL(1, 14), 32 * DIV(14) }, { VAL(1, 15), 32 * DIV(15) }, + { /* sentinel */ } +}; + +static int ad24xx_clk_prepare(struct clk_hw *hw) +{ + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); + unsigned int idx = clkout->idx; + + return regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), + A2B_CLKCFG_EN_MASK, + FIELD_PREP(A2B_CLKCFG_EN_MASK, 1)); +} + +static void ad24xx_clk_unprepare(struct clk_hw *hw) +{ + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); + unsigned int idx = clkout->idx; + + regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), A2B_CLKCFG_EN_MASK, + FIELD_PREP(A2B_CLKCFG_EN_MASK, 0)); +} + +static unsigned long ad24xx_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); + unsigned int idx = clkout->idx; + unsigned int val; + int ret; + + ret = regmap_read(adclk->regmap, A2B_CLKCFG(idx), &val); + if (ret) + return 0; + + val &= A2B_CLKCFG_PDIV_MASK | A2B_CLKCFG_DIV_MASK; + + return divider_recalc_rate(hw, parent_rate, val, ad24xx_clk_div_table, + 0, AD24XX_CLK_DIV_WIDTH); +} + +static long ad24xx_clk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + return divider_round_rate(hw, rate, parent_rate, ad24xx_clk_div_table, + AD24XX_CLK_DIV_WIDTH, 0); +} + +static int ad24xx_clk_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) +{ + return divider_determine_rate(hw, req, ad24xx_clk_div_table, + AD24XX_CLK_DIV_WIDTH, 0); +} + +static int ad24xx_clk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); + unsigned int idx = clkout->idx; + int val; + + val = divider_get_val(rate, parent_rate, ad24xx_clk_div_table, + AD24XX_CLK_DIV_WIDTH, 0); + if (val < 0) + return val; + + return regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), + A2B_CLKCFG_PDIV_MASK | A2B_CLKCFG_DIV_MASK, + val); +} + +static int ad24xx_clk_get_phase(struct clk_hw *hw) +{ + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); + unsigned int idx = clkout->idx; + unsigned int val; + bool invert; + int ret; + + ret = regmap_read(adclk->regmap, A2B_CLKCFG(idx), &val); + if (ret) + return ret; + + invert = FIELD_GET(A2B_CLKCFG_INV_MASK, val); + + return invert ? 180 : 0; +} + +static int ad24xx_clk_set_phase(struct clk_hw *hw, int degrees) +{ + struct ad24xx_clkout *clkout = to_ad24xx_clkout(hw); + struct ad24xx_clk *adclk = to_ad24xx_clk(clkout); + unsigned int idx = clkout->idx; + bool invert = !!degrees; + + if (degrees != 0 && degrees != 180) + return -EINVAL; + + return regmap_update_bits(adclk->regmap, A2B_CLKCFG(idx), + A2B_CLKCFG_INV_MASK, + FIELD_PREP(A2B_CLKCFG_INV_MASK, invert)); +} + +static const struct clk_ops ad24xx_clk_ops = { + .prepare = ad24xx_clk_prepare, + .unprepare = ad24xx_clk_unprepare, + .recalc_rate = ad24xx_clk_recalc_rate, + .round_rate = ad24xx_clk_round_rate, + .determine_rate = ad24xx_clk_determine_rate, + .set_rate = ad24xx_clk_set_rate, + .get_phase = ad24xx_clk_get_phase, + .set_phase = ad24xx_clk_set_phase, +}; + +static const struct regmap_config ad24xx_clk_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .cache_type = REGCACHE_RBTREE, +}; + +static struct clk_hw *ad24xx_clk_of_get(struct of_phandle_args *clkspec, void *data) +{ + struct ad24xx_clk *adclk = data; + unsigned int idx = clkspec->args[0]; + + if (idx >= AD24XX_NUM_CLKS) + return ERR_PTR(-EINVAL); + + if (!adclk->clkouts[idx].registered) + return ERR_PTR(-ENOENT); + + return &adclk->clkouts[idx].hw; +} + +static int ad24xx_clk_probe(struct device *dev) +{ + struct a2b_func *func = to_a2b_func(dev); + struct a2b_node *node = func->node; + struct device_node *np = dev->of_node; + char *pll_name; + const char *sync_clk_name; + struct ad24xx_clk *adclk; + int num_clks; + int ret; + int i; + + /* + * Older series AD240x and AD241x chips have a single discrete + * A2B_CLKCFG register that behaves differently to the A2B_CLKnCFG + * registers of the later AD242x series. This driver only supports the + * latter right now. + */ + if (!(node->chip_info->caps & A2B_CHIP_CAP_CLKOUT)) + return -ENODEV; + + adclk = devm_kzalloc(dev, sizeof(*adclk), GFP_KERNEL); + if (!adclk) + return -ENOMEM; + + adclk->regmap = + devm_regmap_init_a2b_func(func, &ad24xx_clk_regmap_config); + if (IS_ERR(adclk->regmap)) + return PTR_ERR(adclk->regmap); + + adclk->dev = dev; + adclk->func = func; + adclk->node = node; + dev_set_drvdata(dev, adclk); + + num_clks = of_property_count_strings(np, "clock-output-names"); + if (num_clks < 0 || num_clks > AD24XX_NUM_CLKS) + return -EINVAL; + + /* + * Register the PLL internally to use it as the parent of the CLKOUTs. + * The PLL runs at 2048 times the SYNC clock rate. + */ + pll_name = + devm_kasprintf(dev, GFP_KERNEL, "%s_pll", dev_name(&node->dev)); + if (!pll_name) + return -ENOMEM; + sync_clk_name = __clk_get_name(a2b_node_get_sync_clk(func->node)); + adclk->pll_hw = devm_clk_hw_register_fixed_factor( + dev, pll_name, sync_clk_name, 0, 2048, 1); + if (IS_ERR(adclk->pll_hw)) + return PTR_ERR(adclk->pll_hw); + + for (i = 0; i < num_clks; i++) { + struct clk_init_data init = { }; + const char *parent_names = clk_hw_get_name(adclk->pll_hw); + unsigned int idx = i; + + /* Clock outputs can be skipped with the clock-indices property */ + of_property_read_u32_index(np, "clock-indices", i, &idx); + if (idx > AD24XX_NUM_CLKS) + return -EINVAL; + + ret = of_property_read_string_index(np, "clock-output-names", i, + &init.name); + if (ret) + return ret; + + init.ops = &ad24xx_clk_ops; + init.parent_names = &parent_names; + init.num_parents = 1; + + adclk->clkouts[idx].hw.init = &init; + adclk->clkouts[idx].idx = idx; + adclk->clkouts[idx].registered = true; + + ret = devm_clk_hw_register(dev, &adclk->clkouts[idx].hw); + if (ret) + return ret; + } + + ret = devm_of_clk_add_hw_provider(dev, ad24xx_clk_of_get, adclk); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id ad24xx_clk_of_match_table[] = { + { .compatible = "adi,ad2420-clk" }, + { .compatible = "adi,ad2421-clk" }, + { .compatible = "adi,ad2422-clk" }, + { .compatible = "adi,ad2425-clk" }, + { .compatible = "adi,ad2426-clk" }, + { .compatible = "adi,ad2427-clk" }, + { .compatible = "adi,ad2428-clk" }, + { .compatible = "adi,ad2429-clk" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ad24xx_clk_of_match_table); + +static struct a2b_driver ad24xx_clk_driver = { + .driver = { + .name = "ad24xx-clk", + .of_match_table = ad24xx_clk_of_match_table, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .probe = ad24xx_clk_probe, +}; +module_a2b_driver(ad24xx_clk_driver); + +MODULE_AUTHOR("Alvin Šipraga <alsi@bang-olufsen.dk>"); +MODULE_DESCRIPTION("AD24xx CLK driver"); +MODULE_LICENSE("GPL");