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pinctrl: rockchip: add support the get_direction 

This patch adds the get_direction to support the gpio
interface.

The gpio direction is not used on rockchip platform when use the gpio
debugfs.

Tested on kylin board. (RK3036 SoCs)
The repro steps:
$/sys/class/gpio/
echo 53 > export
$/sys/class/gpio/gpio53# cat direction
in
In general, the gpio53 should be out value, but the direction is the
default value 'in',  since the get_direction didn't supported in rockchip
pinctrl.

So, we should add this patch to support it.

Cc: linux-gpio@vger.kernel.org
Cc: linux-rockchip@lists.infradead.org
Reported-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Caesar Wang 2016-03-15 15:55:45 +08:00 committed by Linus Walleij
parent 658b476c74
commit 6ba20a00a3
1 changed files with 11 additions and 0 deletions
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11
drivers/pinctrl/pinctrl-rockchip.c
View File

@ -1208,6 +1208,16 @@ static int rockchip_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
return 0;
}
static int rockchip_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct rockchip_pin_bank *bank = gpiochip_get_data(chip);
u32 data;
data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
return !(data & BIT(offset));
}
/*
* The calls to gpio_direction_output() and gpio_direction_input()
* leads to this function call (via the pinctrl_gpio_direction_{input|output}()
@ -1741,6 +1751,7 @@ static const struct gpio_chip rockchip_gpiolib_chip = {
.free = gpiochip_generic_free,
.set = rockchip_gpio_set,
.get = rockchip_gpio_get,
.get_direction = rockchip_gpio_get_direction,
.direction_input = rockchip_gpio_direction_input,
.direction_output = rockchip_gpio_direction_output,
.to_irq = rockchip_gpio_to_irq,