pinctrl/amd: add get_direction handler

On boot, gpiochip_add_data() initializes the FLAG_IS_OUT bit in
desc->flags iff its gpio_chip does not have ->direction_input() handler,
else it is initialized to 0, which implies the GPIO is an "input".

Later, the sysfs "direction" handler will use gpiod_get_direction() to
get the current direction, but if no ->get_direction() handler is
installed, the result will just be the current (initial) value of flags,
which will always be OUT irregardless of the initial register value.

Add a get_direction() handler to pinctrl-amd to fix this and always
provide the correct value for direction.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index 61d830c..281b700 100644 (file)
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -40,6 +40,19 @@
 #include "pinctrl-utils.h"
 #include "pinctrl-amd.h"
 
+static int amd_gpio_get_direction(struct gpio_chip *gc, unsigned offset)
+{
+       unsigned long flags;
+       u32 pin_reg;
+       struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
+
+       raw_spin_lock_irqsave(&gpio_dev->lock, flags);
+       pin_reg = readl(gpio_dev->base + offset * 4);
+       raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
+
+       return !(pin_reg & BIT(OUTPUT_ENABLE_OFF));
+}
+
 static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 {
        unsigned long flags;
@@ -845,6 +858,7 @@ static int amd_gpio_probe(struct platform_device *pdev)
 #endif
 
        gpio_dev->pdev = pdev;
+       gpio_dev->gc.get_direction      = amd_gpio_get_direction;
        gpio_dev->gc.direction_input    = amd_gpio_direction_input;
        gpio_dev->gc.direction_output   = amd_gpio_direction_output;
        gpio_dev->gc.get                        = amd_gpio_get_value;