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Date: Tue, 17 Mar 2020 20:28:56 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Michael Walle <michael@...le.cc>, linux-gpio@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-pwm@...r.kernel.org,
linux-watchdog@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Cc: Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
Jean Delvare <jdelvare@...e.com>,
Lee Jones <lee.jones@...aro.org>,
Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH 05/18] mfd: Add support for Kontron sl28cpld management
controller
On 3/17/20 1:50 PM, Michael Walle wrote:
> This patch adds core support for the board management controller found
> on the SMARC-sAL28 board. 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.
>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> drivers/mfd/Kconfig | 21 ++++++
> drivers/mfd/Makefile | 2 +
> drivers/mfd/sl28cpld.c | 155 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 178 insertions(+)
> create mode 100644 drivers/mfd/sl28cpld.c
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 3c547ed575e6..01588c366476 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -2059,5 +2059,26 @@ 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
> + tristate "Kontron sl28 core driver"
> + depends on I2C=y
Why I2C=y and not just I2C ?
> + depends on OF
> + select REGMAP_I2C
> + select REGMAP_IRQ
> + select SL28CPLD_IRQ
> + 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..789f21f90752
> --- /dev/null
> +++ b/drivers/mfd/sl28cpld.c
> @@ -0,0 +1,155 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * MFD core for the CPLD on a SMARC-sAL28 board.
> + *
> + * Copyright 2019 Kontron Europe GmbH
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/interrupt.h>
> +#include <linux/mfd/core.h>
> +
> +#define SL28CPLD_VERSION 0x03
> +#define SL28CPLD_WATCHDOG_BASE 0x4
> +#define SL28CPLD_HWMON_FAN_BASE 0xb
> +#define SL28CPLD_PWM0_BASE 0xc
> +#define SL28CPLD_PWM1_BASE 0xe
> +#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("sl28cpld-wdt", sl28cpld_watchdog_resources, NULL, 0, 0,
> + "kontron,sl28cpld-wdt"),
> + OF_MFD_CELL("sl28cpld-fan", sl28cpld_hwmon_fan_resources, NULL, 0, 0,
> + "kontron,sl28cpld-fan"),
> + OF_MFD_CELL("sl28cpld-pwm", sl28cpld_pwm0_resources, NULL, 0, 0,
> + "kontron,sl28cpld-pwm"),
> + OF_MFD_CELL("sl28cpld-pwm", sl28cpld_pwm1_resources, NULL, 0, 1,
> + "kontron,sl28cpld-pwm"),
> + OF_MFD_CELL("sl28cpld-gpio", sl28cpld_gpio0_resources, NULL, 0, 0,
> + "kontron,sl28cpld-gpio"),
> + OF_MFD_CELL("sl28cpld-gpio", sl28cpld_gpio1_resources, NULL, 0, 1,
> + "kontron,sl28cpld-gpio"),
> + OF_MFD_CELL("sl28cpld-gpo", sl28cpld_gpo_resources, NULL, 0, 0,
> + "kontron,sl28cpld-gpo"),
> + OF_MFD_CELL("sl28cpld-gpi", sl28cpld_gpi_resources, NULL, 0, 0,
> + "kontron,sl28cpld-gpi"),
> + OF_MFD_CELL("sl28cpld-intc", sl28cpld_intc_resources, NULL, 0, 0,
> + "kontron,sl28cpld-intc"),
> +};
> +
> +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_LICENSE("GPL");
>
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