linux-kernel - [RFC v2 1/5] pinctrl: define PIN_CONFIG

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Message-Id: <20231005025843.508689-2-takahiro.akashi@linaro.org>
Date:   Thu,  5 Oct 2023 11:58:39 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     sudeep.holla@....com, cristian.marussi@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linus.walleij@...aro.org
Cc:     Oleksii_Moisieiev@...m.com, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [RFC v2 1/5] pinctrl: define PIN_CONFIG_INPUT

This configuration is intended to be used to allow a pin controller based
GPIO driver to obtain a value at a gpio input pin.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
RFC v2 (Oct 5, 2023)
* improve a comment against @PIN_CONFIG_INPUT as per Linus
RFC(Oct 2, 2023)
---
 include/linux/pinctrl/pinconf-generic.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index d74b7a4ea154..da0d80aa532d 100644
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -67,6 +67,10 @@ struct pinctrl_map;
  *	passed as argument. The argument is in mA.
  * @PIN_CONFIG_DRIVE_STRENGTH_UA: the pin will sink or source at most the current
  *	passed as argument. The argument is in uA.
+ * @PIN_CONFIG_INPUT: This will obtain a value on an input pin. To put a line
+ *	into input mode, @PIN_CONFIG_INPUT_ENABLE must be used. Otherwise,
+ *	an error will be returned. The returned argument is 1 for logic high
+ *	and 0 for logic low.
  * @PIN_CONFIG_INPUT_DEBOUNCE: this will configure the pin to debounce mode,
  *	which means it will wait for signals to settle when reading inputs. The
  *	argument gives the debounce time in usecs. Setting the
@@ -128,6 +132,7 @@ enum pin_config_param {
 	PIN_CONFIG_DRIVE_PUSH_PULL,
 	PIN_CONFIG_DRIVE_STRENGTH,
 	PIN_CONFIG_DRIVE_STRENGTH_UA,
+	PIN_CONFIG_INPUT,
 	PIN_CONFIG_INPUT_DEBOUNCE,
 	PIN_CONFIG_INPUT_ENABLE,
 	PIN_CONFIG_INPUT_SCHMITT,
-- 
2.34.1