pinctrl: Add skew-delay pin config and bindings

Some pin controllers (such as the Gemini) can control the
expected clock skew and output delay on certain pins with a
sub-nanosecond granularity. This is typically done by shunting
in a number of double inverters in front of or behind the pin.
Make it possible to configure this with a generic binding.

Cc: devicetree@vger.kernel.org
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index 8eaa25c3384f..b4f7f8a458ea 100644
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -49,6 +49,7 @@ static const struct pin_config_item conf_items[] = {
         PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
         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),
 };
 
 static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
@@ -181,6 +182,7 @@ static const struct pinconf_generic_params dt_params[] = {
         { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
         { "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
         { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
+        { "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
 };
 
 /**