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Commit e8dacf59 authored by Baruch Siach's avatar Baruch Siach Committed by Linus Walleij
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gpio: mvebu: implement get_direction 



struct gpio_chip documentation recommends to always implement this
callback function.

A more concrete motivation is to be able (in combination with
GPIOD_ASIS) to detect whether the bootloader has changed the state of a
GPIO signal.

Signed-off-by: default avatarBaruch Siach <baruch@tkos.co.il>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent bfeffd15

drivers/gpio/gpio-mvebu.c

+11 −0
Original line number Diff line number Diff line
@@ -376,6 +376,16 @@ static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, 
	return 0;

}



static int mvebu_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)

{

	struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);

	u32 u;



	regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u);



	return !!(u & BIT(pin));

}



static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin)

{

	struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip);
@@ -1130,6 +1140,7 @@ static int mvebu_gpio_probe(struct platform_device *pdev) 
	mvchip->chip.parent = &pdev->dev;

	mvchip->chip.request = gpiochip_generic_request;

	mvchip->chip.free = gpiochip_generic_free;

	mvchip->chip.get_direction = mvebu_gpio_get_direction;

	mvchip->chip.direction_input = mvebu_gpio_direction_input;

	mvchip->chip.get = mvebu_gpio_get;

	mvchip->chip.direction_output = mvebu_gpio_direction_output;