gpio: omap: handle pin config bias flags

Modify omap_gpio_set_config() to handle pin config bias flags by calling
gpiochip_generic_config().

The pin group for the gpio line must have the corresponding pinconf
properties:

PIN_CONFIG_BIAS_PULL_UP requires "pinctrl-single,bias-pullup"
PIN_CONFIG_BIAS_PULL_DOWN requires "pinctrl-single,bias-pulldown"

This is necessary for pcs_pinconf_set() to find the requested bias
parameter in the PIN_MAP_TYPE_CONFIGS_GROUP pinctrl map.

Signed-off-by: Drew Fustini <drew@beagleboard.org>
Acked-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20200715213738.1640030-1-drew@beagleboard.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index b8e2ecc..eba303c 100644 (file)
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -896,12 +896,21 @@ static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
                                unsigned long config)
 {
        u32 debounce;
+       int ret = -ENOTSUPP;
 
-       if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
-               return -ENOTSUPP;
+       if ((pinconf_to_config_param(config) == PIN_CONFIG_BIAS_DISABLE) ||
+           (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_UP) ||
+           (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_DOWN))
+       {
+               ret = gpiochip_generic_config(chip, offset, config);
+       }
+       else if (pinconf_to_config_param(config) == PIN_CONFIG_INPUT_DEBOUNCE)
+       {
+               debounce = pinconf_to_config_argument(config);
+               ret = omap_gpio_debounce(chip, offset, debounce);
+       }
 
-       debounce = pinconf_to_config_argument(config);
-       return omap_gpio_debounce(chip, offset, debounce);
+       return ret;
 }
 
 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)