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pinctrl: intel: Implement intel_gpio_get_direction callback 

Allows querying GPIO direction from the pad config register.
If the pad is not in GPIO mode, return an error.

Signed-off-by: Javier Arteaga <javier@emutex.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Javier Arteaga 2018-03-06 13:42:13 +00:00 committed by Linus Walleij
parent 86822c2f3a
commit 67e6d3e83c
1 changed files with 19 additions and 0 deletions
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19
drivers/pinctrl/intel/pinctrl-intel.c
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@ -788,6 +788,24 @@ static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
{
struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
void __iomem *reg;
u32 padcfg0;
reg = intel_get_padcfg(pctrl, offset, PADCFG0);
if (!reg)
return -EINVAL;
padcfg0 = readl(reg);
if (padcfg0 & PADCFG0_PMODE_MASK)
return -EINVAL;
return !!(padcfg0 & PADCFG0_GPIOTXDIS);
}
static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_gpio_direction_input(chip->base + offset);
@ -804,6 +822,7 @@ static const struct gpio_chip intel_gpio_chip = {
.owner = THIS_MODULE,
.request = gpiochip_generic_request,
.free = gpiochip_generic_free,
.get_direction = intel_gpio_get_direction,
.direction_input = intel_gpio_direction_input,
.direction_output = intel_gpio_direction_output,
.get = intel_gpio_get,