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 <jav...@emutex.com> --- This is needed by the drivers for the UP Squared board, an APL-based platform. (For now, these drivers are out-of-tree.) An earlier version of this patch was reviewed some time ago by Andy Shevchenko outside of the mailing lists: <https://github.com/emutex/ubilinux-kernel/commit/708a776f2ffd1b1c> drivers/pinctrl/intel/pinctrl-intel.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c index 96e73e30204e..1e24a6b8a64e 100644 --- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -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, -- 2.16.2
