Commit 93847930 authored by Marek Vasut's avatar Marek Vasut Committed by Linus Walleij
Browse files

gpio: Add ROHM BD9571MWV-M PMIC GPIO driver 



Add driver for the GPIO block in the ROHM BD9571MWV-W MFD PMIC.
This block is pretty trivial and supports setting GPIO direction
as Input/Output and in case of Output, supports setting value.

Signed-off-by: default avatarMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: linux-gpio@vger.kernel.org
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 881ebd22

drivers/gpio/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -844,6 +844,17 @@ config GPIO_ARIZONA 
	help

	  Support for GPIOs on Wolfson Arizona class devices.



config GPIO_BD9571MWV

	tristate "ROHM BD9571 GPIO support"

	depends on MFD_BD9571MWV

	help

	  Support for GPIOs on ROHM BD9571 PMIC. There are two GPIOs

	  available on the ROHM PMIC in total, both of which can also

	  generate interrupts.



	  This driver can also be built as a module. If so, the module

	  will be called gpio-bd9571mwv.



config GPIO_CRYSTAL_COVE

	tristate "GPIO support for Crystal Cove PMIC"

	depends on (X86 || COMPILE_TEST) && INTEL_SOC_PMIC

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o 
obj-$(CONFIG_GPIO_ASPEED)	+= gpio-aspeed.o

obj-$(CONFIG_GPIO_AXP209)	+= gpio-axp209.o

obj-$(CONFIG_GPIO_BCM_KONA)	+= gpio-bcm-kona.o

obj-$(CONFIG_GPIO_BD9571MWV)	+= gpio-bd9571mwv.o

obj-$(CONFIG_GPIO_BRCMSTB)	+= gpio-brcmstb.o

obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o

obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o

drivers/gpio/gpio-bd9571mwv.c

0 → 100644
+144 −0
Original line number Diff line number Diff line 
/*

 * ROHM BD9571MWV-M GPIO driver

 *

 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>

 *

 * 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 TPS65086 driver

 *

 * NOTE: Interrupts are not supported yet.

 */



#include <linux/gpio/driver.h>

#include <linux/module.h>

#include <linux/platform_device.h>



#include <linux/mfd/bd9571mwv.h>



struct bd9571mwv_gpio {

	struct gpio_chip chip;

	struct bd9571mwv *bd;

};



static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,

				       unsigned int offset)

{

	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

	int ret, val;



	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);

	if (ret < 0)

		return ret;



	return val & BIT(offset);

}



static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,

					 unsigned int offset)

{

	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);



	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,

			   BIT(offset), 0);



	return 0;

}



static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,

					  unsigned int offset, int value)

{

	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);



	/* Set the initial value */

	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,

			   BIT(offset), value ? BIT(offset) : 0);

	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,

			   BIT(offset), BIT(offset));



	return 0;

}



static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)

{

	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

	int ret, val;



	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);

	if (ret < 0)

		return ret;



	return val & BIT(offset);

}



static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,

			      int value)

{

	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);



	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,

			   BIT(offset), value ? BIT(offset) : 0);

}



static const struct gpio_chip template_chip = {

	.label			= "bd9571mwv-gpio",

	.owner			= THIS_MODULE,

	.get_direction		= bd9571mwv_gpio_get_direction,

	.direction_input	= bd9571mwv_gpio_direction_input,

	.direction_output	= bd9571mwv_gpio_direction_output,

	.get			= bd9571mwv_gpio_get,

	.set			= bd9571mwv_gpio_set,

	.base			= -1,

	.ngpio			= 2,

	.can_sleep		= true,

};



static int bd9571mwv_gpio_probe(struct platform_device *pdev)

{

	struct bd9571mwv_gpio *gpio;

	int ret;



	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);

	if (!gpio)

		return -ENOMEM;



	platform_set_drvdata(pdev, gpio);



	gpio->bd = dev_get_drvdata(pdev->dev.parent);

	gpio->chip = template_chip;

	gpio->chip.parent = gpio->bd->dev;



	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);

	if (ret < 0) {

		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);

		return ret;

	}



	return 0;

}



static const struct platform_device_id bd9571mwv_gpio_id_table[] = {

	{ "bd9571mwv-gpio", },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);



static struct platform_driver bd9571mwv_gpio_driver = {

	.driver = {

		.name = "bd9571mwv-gpio",

	},

	.probe = bd9571mwv_gpio_probe,

	.id_table = bd9571mwv_gpio_id_table,

};

module_platform_driver(bd9571mwv_gpio_driver);



MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");

MODULE_DESCRIPTION("BD9571MWV GPIO driver");

MODULE_LICENSE("GPL v2");

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