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pinctrl/amd: add get_direction handler

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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>
This commit is contained in:
Daniel Kurtz 2018-02-16 12:12:43 -07:00 committed by Linus Walleij
parent b5520891a3
commit 12b10f47e5
1 changed files with 14 additions and 0 deletions
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14
drivers/pinctrl/pinctrl-amd.c
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@ -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;