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bh=SUECqCfzEEvWPBtkoJEbwPzhLTHGLBes4B0V/gGklX0=; b=EipujZYj5ScXnw2cZ+rk7CWjbPAAeKpdwQZlFPm6TqmrkMoiL+F+EkKuz9dzZu7CQFoFOY TqRiKBe5+fTtxTg1IESNtfuPLOdAQ8mQJoWquY422CGCqGDmX3ZlqfM/bK2g+L+gvCKAl5 bHJlx+DHdOW9EP0gmc5/ux8aUk+lJ3U= From: Michael Walle To: Andy Shevchenko , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 05/16] mfd: Add support for Kontron sl28cpld management controller Date: Thu, 23 Apr 2020 19:45:32 +0200 Message-Id: <20200423174543.17161-6-michael@walle.cc> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200423174543.17161-1-michael@walle.cc> References: <20200423174543.17161-1-michael@walle.cc> MIME-Version: 1.0 X-Spamd-Bar: ++++++ X-Spam-Level: ****** X-Rspamd-Server: web X-Spam-Status: Yes, score=6.40 X-Spam-Score: 6.40 X-Rspamd-Queue-Id: 5A05223061 X-Spamd-Result: default: False [6.40 / 15.00]; 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It consists of the following functions: - watchdog - GPIO controller - PWM controller - fan sensor - interrupt controller At the moment, this controller is used on the Kontron SMARC-sAL28 board. Please note that the MFD driver is defined as bool in the Kconfig because the next patch will add interrupt support. Signed-off-by: Michael Walle --- drivers/mfd/Kconfig | 19 +++++ drivers/mfd/Makefile | 2 + drivers/mfd/sl28cpld.c | 153 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 174 insertions(+) create mode 100644 drivers/mfd/sl28cpld.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 0a59249198d3..be0c8d93c526 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -2060,5 +2060,24 @@ config SGI_MFD_IOC3 If you have an SGI Origin, Octane, or a PCI IOC3 card, then say Y. Otherwise say N. +config MFD_SL28CPLD + bool "Kontron sl28 core driver" + depends on I2C=y + depends on OF + select REGMAP_I2C + select MFD_CORE + help + This option enables support for the board management controller + found on the Kontron sl28 CPLD. You have to select individual + functions, such as watchdog, GPIO, etc, under the corresponding menus + in order to enable them. + + Currently supported boards are: + + Kontron SMARC-sAL28 + + To compile this driver as a module, choose M here: the module will be + called sl28cpld. + endmenu endif diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index f935d10cbf0f..9bc38863b9c7 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -259,3 +259,5 @@ obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o obj-$(CONFIG_MFD_STMFX) += stmfx.o obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o + +obj-$(CONFIG_MFD_SL28CPLD) += sl28cpld.o diff --git a/drivers/mfd/sl28cpld.c b/drivers/mfd/sl28cpld.c new file mode 100644 index 000000000000..1e5860cc7ffc --- /dev/null +++ b/drivers/mfd/sl28cpld.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core for the sl28cpld. + * + * Copyright 2019 Kontron Europe GmbH + */ + +#include +#include +#include +#include +#include +#include +#include + +#define SL28CPLD_VERSION 0x03 +#define SL28CPLD_WATCHDOG_BASE 0x04 +#define SL28CPLD_HWMON_FAN_BASE 0x0b +#define SL28CPLD_PWM0_BASE 0x0c +#define SL28CPLD_PWM1_BASE 0x0e +#define SL28CPLD_GPIO0_BASE 0x10 +#define SL28CPLD_GPIO1_BASE 0x15 +#define SL28CPLD_GPO_BASE 0x1a +#define SL28CPLD_GPI_BASE 0x1b +#define SL28CPLD_INTC_BASE 0x1c + +/* all subdevices share the same IRQ */ +#define SL28CPLD_IRQ 0 + +#define SL28CPLD_MIN_REQ_VERSION 14 + +struct sl28cpld { + struct device *dev; + struct regmap *regmap; +}; + +static const struct regmap_config sl28cpld_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .reg_stride = 1, +}; + +static struct resource sl28cpld_watchdog_resources[] = { + DEFINE_RES_REG(SL28CPLD_WATCHDOG_BASE, 1), +}; + +static struct resource sl28cpld_hwmon_fan_resources[] = { + DEFINE_RES_REG(SL28CPLD_HWMON_FAN_BASE, 1), +}; + +static struct resource sl28cpld_pwm0_resources[] = { + DEFINE_RES_REG(SL28CPLD_PWM0_BASE, 1), +}; + +static struct resource sl28cpld_pwm1_resources[] = { + DEFINE_RES_REG(SL28CPLD_PWM1_BASE, 1), +}; + +static struct resource sl28cpld_gpio0_resources[] = { + DEFINE_RES_REG(SL28CPLD_GPIO0_BASE, 1), + DEFINE_RES_IRQ(SL28CPLD_IRQ), +}; + +static struct resource sl28cpld_gpio1_resources[] = { + DEFINE_RES_REG(SL28CPLD_GPIO1_BASE, 1), + DEFINE_RES_IRQ(SL28CPLD_IRQ), +}; + +static struct resource sl28cpld_gpo_resources[] = { + DEFINE_RES_REG(SL28CPLD_GPO_BASE, 1), +}; + +static struct resource sl28cpld_gpi_resources[] = { + DEFINE_RES_REG(SL28CPLD_GPI_BASE, 1), +}; + +static struct resource sl28cpld_intc_resources[] = { + DEFINE_RES_REG(SL28CPLD_INTC_BASE, 1), + DEFINE_RES_IRQ(SL28CPLD_IRQ), +}; + +static const struct mfd_cell sl28cpld_devs[] = { + OF_MFD_CELL_REG("sl28cpld-wdt", sl28cpld_watchdog_resources, + NULL, 0, 0, "kontron,sl28cpld-wdt", 0), + OF_MFD_CELL_REG("sl28cpld-fan", sl28cpld_hwmon_fan_resources, + NULL, 0, 0, "kontron,sl28cpld-fan", 1), + OF_MFD_CELL_REG("sl28cpld-pwm", sl28cpld_pwm0_resources, + NULL, 0, 0, "kontron,sl28cpld-pwm", 2), + OF_MFD_CELL_REG("sl28cpld-pwm", sl28cpld_pwm1_resources, + NULL, 0, 1, "kontron,sl28cpld-pwm", 3), + OF_MFD_CELL_REG("sl28cpld-gpio", sl28cpld_gpio0_resources, + NULL, 0, 0, "kontron,sl28cpld-gpio", 4), + OF_MFD_CELL_REG("sl28cpld-gpio", sl28cpld_gpio1_resources, + NULL, 0, 1, "kontron,sl28cpld-gpio", 5), + OF_MFD_CELL_REG("sl28cpld-gpo", sl28cpld_gpo_resources, + NULL, 0, 0, "kontron,sl28cpld-gpo", 6), + OF_MFD_CELL_REG("sl28cpld-gpi", sl28cpld_gpi_resources, + NULL, 0, 0, "kontron,sl28cpld-gpi", 7), + MFD_CELL_RES("sl28cpld-intc", sl28cpld_intc_resources), +}; + +static int sl28cpld_probe(struct i2c_client *i2c) +{ + struct sl28cpld *sl28cpld; + struct device *dev = &i2c->dev; + unsigned int cpld_version; + int ret; + + sl28cpld = devm_kzalloc(dev, sizeof(*sl28cpld), GFP_KERNEL); + if (!sl28cpld) + return -ENOMEM; + + sl28cpld->regmap = devm_regmap_init_i2c(i2c, &sl28cpld_regmap_config); + if (IS_ERR(sl28cpld->regmap)) + return PTR_ERR(sl28cpld->regmap); + + ret = regmap_read(sl28cpld->regmap, SL28CPLD_VERSION, &cpld_version); + if (ret) + return ret; + + if (cpld_version < SL28CPLD_MIN_REQ_VERSION) { + dev_err(dev, "unsupported CPLD version %d\n", cpld_version); + return -ENODEV; + } + + sl28cpld->dev = dev; + i2c_set_clientdata(i2c, sl28cpld); + + dev_info(dev, "successfully probed. CPLD version %d\n", cpld_version); + + return devm_mfd_add_devices(dev, -1, sl28cpld_devs, + ARRAY_SIZE(sl28cpld_devs), NULL, + i2c->irq, NULL); +} + +static const struct of_device_id sl28cpld_of_match[] = { + { .compatible = "kontron,sl28cpld", }, + {} +}; +MODULE_DEVICE_TABLE(of, sl28cpld_of_match); + +static struct i2c_driver sl28cpld_driver = { + .probe_new = sl28cpld_probe, + .driver = { + .name = "sl28cpld", + .of_match_table = of_match_ptr(sl28cpld_of_match), + }, +}; +module_i2c_driver(sl28cpld_driver); + +MODULE_DESCRIPTION("sl28cpld MFD Core Driver"); +MODULE_AUTHOR("Michael Walle "); +MODULE_LICENSE("GPL");