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gpio: Add ROHM BD9571MWV-M PMIC GPIO driver

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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: Marek 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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Marek Vasut 2017-04-25 20:32:09 +02:00 committed by Linus Walleij
parent 881ebd229f
commit 9384793036
3 changed files with 156 additions and 0 deletions
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11
drivers/gpio/Kconfig
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@ -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

1
drivers/gpio/Makefile
View File

@ -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

144
drivers/gpio/gpio-bd9571mwv.c Normal file
View File

@ -0,0 +1,144 @@
/*
* 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");