Re: [PATCH v6 3/3] gpio: tps65086: Add GPO driver for the TPS65086 PMIC

[Lee Jones <lee.jones@xxxxxxxxxx>]

On Mon, 25 Jan 2016, Andrew F. Davis wrote:

> Add support for the TPS65086 PMIC GPOs.
> 
> TPS65086 has four configurable GPOs that can be used for several
> purposes. These are output only.
> 
> Signed-off-by: Andrew F. Davis <afd@xxxxxx>
> ---
>  drivers/gpio/Kconfig         |   6 ++
>  drivers/gpio/Makefile        |   1 +
>  drivers/gpio/gpio-tps65086.c | 144 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 151 insertions(+)
>  create mode 100644 drivers/gpio/gpio-tps65086.c

Is this patch orthogonal to the other two in the set, or do they all
need to go in together?

> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index c88dd24..e35e120 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -844,6 +844,12 @@ config GPIO_TIMBERDALE
>  	---help---
>  	Add support for the GPIO IP in the timberdale FPGA.
>  
> +config GPIO_TPS65086
> +	tristate "TI TPS65086 GPO"
> +	depends on MFD_TPS65086
> +	help
> +	  This driver supports the GPO on TI TPS65086x PMICs.
> +
>  config GPIO_TPS6586X
>  	bool "TPS6586X GPIO"
>  	depends on MFD_TPS6586X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index ece7d7c..c759190 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -95,6 +95,7 @@ obj-$(CONFIG_GPIO_TC3589X)	+= gpio-tc3589x.o
>  obj-$(CONFIG_ARCH_TEGRA)	+= gpio-tegra.o
>  obj-$(CONFIG_GPIO_TIMBERDALE)	+= gpio-timberdale.o
>  obj-$(CONFIG_GPIO_PALMAS)	+= gpio-palmas.o
> +obj-$(CONFIG_GPIO_TPS65086)	+= gpio-tps65086.o
>  obj-$(CONFIG_GPIO_TPS6586X)	+= gpio-tps6586x.o
>  obj-$(CONFIG_GPIO_TPS65910)	+= gpio-tps65910.o
>  obj-$(CONFIG_GPIO_TPS65912)	+= gpio-tps65912.o
> diff --git a/drivers/gpio/gpio-tps65086.c b/drivers/gpio/gpio-tps65086.c
> new file mode 100644
> index 0000000..d5d9e47
> --- /dev/null
> +++ b/drivers/gpio/gpio-tps65086.c
> @@ -0,0 +1,144 @@
> +/*
> + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
> + *	Andrew F. Davis <afd@xxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether expressed or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License version 2 for more details.
> + *
> + * Based on the TPS65912 driver
> + */
> +
> +#include <linux/gpio.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/mfd/tps65086.h>
> +
> +struct tps65086_gpio {
> +	struct gpio_chip chip;
> +	struct tps65086 *tps;
> +};
> +
> +static inline struct tps65086_gpio *to_tps65086_gpio(struct gpio_chip *chip)
> +{
> +	return container_of(chip, struct tps65086_gpio, chip);
> +}
> +
> +static int tps65086_gpio_get_direction(struct gpio_chip *chip,
> +				       unsigned offset)
> +{
> +	/* This device is output only */
> +	return 0;
> +}
> +
> +static int tps65086_gpio_direction_input(struct gpio_chip *chip,
> +					 unsigned offset)
> +{
> +	/* This device is output only */
> +	return -EINVAL;
> +}
> +
> +static int tps65086_gpio_direction_output(struct gpio_chip *chip,
> +					  unsigned offset, int value)
> +{
> +	struct tps65086_gpio *gpio = to_tps65086_gpio(chip);
> +
> +	/* Set the initial value */
> +	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
> +			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
> +
> +	return 0;
> +}
> +
> +static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct tps65086_gpio *gpio = to_tps65086_gpio(chip);
> +	int ret, val;
> +
> +	ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
> +	if (ret < 0)
> +		return ret;
> +
> +	return val & BIT(4 + offset);
> +}
> +
> +static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
> +			      int value)
> +{
> +	struct tps65086_gpio *gpio = to_tps65086_gpio(chip);
> +
> +	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
> +			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
> +}
> +
> +static struct gpio_chip template_chip = {
> +	.label			= "tps65086-gpio",
> +	.owner			= THIS_MODULE,
> +	.get_direction		= tps65086_gpio_get_direction,
> +	.direction_input	= tps65086_gpio_direction_input,
> +	.direction_output	= tps65086_gpio_direction_output,
> +	.get			= tps65086_gpio_get,
> +	.set			= tps65086_gpio_set,
> +	.base			= -1,
> +	.ngpio			= 4,
> +	.can_sleep		= true,
> +};
> +
> +static int tps65086_gpio_probe(struct platform_device *pdev)
> +{
> +	struct tps65086_gpio *gpio;
> +	int ret;
> +
> +	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
> +	if (!gpio)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, gpio);
> +
> +	gpio->tps = dev_get_drvdata(pdev->dev.parent);
> +	gpio->chip = template_chip;
> +	gpio->chip.parent = gpio->tps->dev;
> +
> +	ret = gpiochip_add(&gpio->chip);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int tps65086_gpio_remove(struct platform_device *pdev)
> +{
> +	struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
> +
> +	gpiochip_remove(&gpio->chip);
> +
> +	return 0;
> +}
> +
> +static const struct platform_device_id tps65086_gpio_id_table[] = {
> +	{ "tps65086-gpio", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
> +
> +static struct platform_driver tps65086_gpio_driver = {
> +	.driver = {
> +		.name = "tps65086-gpio",
> +	},
> +	.probe = tps65086_gpio_probe,
> +	.remove = tps65086_gpio_remove,
> +	.id_table = tps65086_gpio_id_table,
> +};
> +module_platform_driver(tps65086_gpio_driver);
> +
> +MODULE_AUTHOR("Andrew F. Davis <afd@xxxxxx>");
> +MODULE_DESCRIPTION("TPS65086 GPIO driver");
> +MODULE_LICENSE("GPL v2");

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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