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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: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Baruch Siach 2019-01-10 14:26:21 +02:00 committed by Linus Walleij
parent bfeffd1552
commit e8dacf5957
1 changed files with 11 additions and 0 deletions
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11
drivers/gpio/gpio-mvebu.c
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@ -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;