pinctrl: pinconf-generic: Add properties 'skew-delay-{in,out}put-ps'

Add the properties 'skew-delay-input-ps' and 'skew-delay-output-ps'
to the generic parameters used for parsing DT files. This allows to
specify the independent skew delay value for the two directions.
This enables drivers that use the generic pin configuration to get
the value passed through these new properties.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: AntonioBorneo

drivers/pinctrl/pinconf-generic.c

@@ -54,6 +54,8 @@ static const struct pin_config_item conf_items[] = {
 	PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
 	PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
 	PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true),
+	PCONFDUMP(PIN_CONFIG_SKEW_DELAY_INPUT_PS, "input skew delay", "ps", true),
+	PCONFDUMP(PIN_CONFIG_SKEW_DELAY_OUTPUT_PS, "output skew delay", "ps", true),
 };
 
 static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
@@ -198,6 +200,8 @@ static const struct pinconf_generic_params dt_params[] = {
 	{ "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
 	{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
 	{ "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
+	{ "skew-delay-input-ps", PIN_CONFIG_SKEW_DELAY_INPUT_PS, 0 },
+	{ "skew-delay-output-ps", PIN_CONFIG_SKEW_DELAY_OUTPUT_PS, 0 },
 };
 
 /**

include/linux/pinctrl/pinconf-generic.h

@@ -112,6 +112,12 @@ struct pinctrl_map;
  *	or latch delay (on outputs) this parameter (in a custom format)
  *	specifies the clock skew or latch delay. It typically controls how
  *	many double inverters are put in front of the line.
+ * @PIN_CONFIG_SKEW_DELAY_INPUT_PS: if the pin has independent values for the
+ *	programmable skew rate (on inputs) and latch delay (on outputs), then
+ *	this parameter specifies the clock skew only. The argument is in ps.
+ * @PIN_CONFIG_SKEW_DELAY_OUPUT_PS: if the pin has independent values for the
+ *	programmable skew rate (on inputs) and latch delay (on outputs), then
+ *	this parameter specifies the latch delay only. The argument is in ps.
  * @PIN_CONFIG_SLEEP_HARDWARE_STATE: indicate this is sleep related state.
  * @PIN_CONFIG_SLEW_RATE: if the pin can select slew rate, the argument to
  *	this parameter (on a custom format) tells the driver which alternative
@@ -147,6 +153,8 @@ enum pin_config_param {
 	PIN_CONFIG_PERSIST_STATE,
 	PIN_CONFIG_POWER_SOURCE,
 	PIN_CONFIG_SKEW_DELAY,
+	PIN_CONFIG_SKEW_DELAY_INPUT_PS,
+	PIN_CONFIG_SKEW_DELAY_OUTPUT_PS,
 	PIN_CONFIG_SLEEP_HARDWARE_STATE,
 	PIN_CONFIG_SLEW_RATE,
 	PIN_CONFIG_END = 0x7F,