在 2016年03月14日 13:44, Caesar Wang 写道:
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.
Change-Id: I237c2e85ac7680b3d0de15bbbb923985b4827def
Resend it since the change id, sorry for the noise.
Reported-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
Signed-off-by: Caesar Wang <wxt@xxxxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Heiko Stuebner <heiko@xxxxxxxxx>
Cc: linux-gpio@xxxxxxxxxxxxxxx
Cc: linux-rockchip@xxxxxxxxxxxxxxxxxxx
---
drivers/pinctrl/pinctrl-rockchip.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index bf032b9..f22a186 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -1208,6 +1208,18 @@ 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);
+ int pin;
+ u32 data;
+
+ pin = offset - chip->base;
+ data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
+
+ return !!(data & BIT(pin));
+}
+
/*
* The calls to gpio_direction_output() and gpio_direction_input()
* leads to this function call (via the pinctrl_gpio_direction_{input|output}()
@@ -1741,6 +1753,7 @@ 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,
--
caesar wang | software engineer | wxt@xxxxxxxxxxxxx
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