pinctrl: pinconf-generic: Add support for "input-schmitt-microvolt" property

Add "input-schmitt-microvolt" property to generic options used for DT
parsing files. This enables drivers, which use generic pin configurations,
to get the value passed to this property.

Signed-off-by: Inochi Amaoto <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/pinconf-generic.c

···
 	PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
+	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_UV, "input schmitt threshold", "uV", true),
 	PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
 	PCONFDUMP(PIN_CONFIG_MODE_LOW_POWER, "pin low power", "mode", true),
 	PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false),
···
 	{ "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
 	{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
 	{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
+	{ "input-schmitt-microvolts", PIN_CONFIG_INPUT_SCHMITT_UV, 0 },
 	{ "low-power-disable", PIN_CONFIG_MODE_LOW_POWER, 0 },
 	{ "low-power-enable", PIN_CONFIG_MODE_LOW_POWER, 1 },
 	{ "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },

include/linux/pinctrl/pinconf-generic.h

···
  * @PIN_CONFIG_INPUT_SCHMITT_ENABLE: control schmitt-trigger mode on the pin.
  *      If the argument != 0, schmitt-trigger mode is enabled. If it's 0,
  *      schmitt-trigger mode is disabled.
+ * @PIN_CONFIG_INPUT_SCHMITT_UV: this will configure an input pin to run in
+ *	schmitt-trigger mode. The argument is in uV.
  * @PIN_CONFIG_MODE_LOW_POWER: this will configure the pin for low power
  *	operation, if several modes of operation are supported these can be
  *	passed in the argument on a custom form, else just use argument 1
···
 	PIN_CONFIG_INPUT_ENABLE,
 	PIN_CONFIG_INPUT_SCHMITT,
 	PIN_CONFIG_INPUT_SCHMITT_ENABLE,
+	PIN_CONFIG_INPUT_SCHMITT_UV,
 	PIN_CONFIG_MODE_LOW_POWER,
 	PIN_CONFIG_MODE_PWM,
 	PIN_CONFIG_OUTPUT,