[PATCH v5 07/11] gpio: dw: Return output value when direction is out

Sean Anderson
2020-08-15T15:52:33Z

dm_gpio_ops.get_value can be called when the gpio is either input or
output. The current dw code always returns the input value, which is
invalid if the direction is set to out.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Ley Foon Tan <ley.foon.tan@intel.com>
---
This patch was previously submitted as part of
https://patchwork.ozlabs.org/project/uboot/list/?series=161576

(no changes since v3)

Changes in v3:
- Undo reorder to prevent use-before-declared error

Changes in v2:
- Reorder changes to minimize diff

drivers/gpio/dwapb_gpio.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/dwapb_gpio.c b/drivers/gpio/dwapb_gpio.c
index a52c9e18e3..37916e7771 100644
--- a/drivers/gpio/dwapb_gpio.c
+++ b/drivers/gpio/dwapb_gpio.c
@@ -66,13 +66,6 @@ static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
return 0;
}

-static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
-{
- struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
- return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
-}
-
-
static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
@@ -98,6 +91,18 @@ static int dwapb_gpio_get_function(struct udevice *dev, unsigned offset)
return GPIOF_INPUT;
}

+static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
+{
+ struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
+ u32 value;
+
+ if (dwapb_gpio_get_function(dev, pin) == GPIOF_OUTPUT)
+ value = readl(plat->base + GPIO_SWPORT_DR(plat->bank));
+ else
+ value = readl(plat->base + GPIO_EXT_PORT(plat->bank));
+ return !!(value & BIT(pin));
+}
+
static const struct dm_gpio_ops gpio_dwapb_ops = {
.direction_input = dwapb_gpio_direction_input,
.direction_output = dwapb_gpio_direction_output,
--
2.28.0