From 3e730ec11d51283ad62a98436967c01b718132ab Mon Sep 17 00:00:00 2001 From: Stephan Gerhold Date: Wed, 9 Dec 2020 19:37:46 -0800 Subject: [PATCH] dt-bindings: input: tm2-touchkey: document vddio-supply The Samsung touchkey controllers are often used with external pull-up for the interrupt line and the I2C lines, so we might need to enable a regulator to bring the lines into usable state. Otherwise, this might cause spurious interrupts and reading from I2C will fail. Document support for a "vddio-supply" that is enabled by the tm2-touchkey driver so that the regulator gets enabled when needed. Signed-off-by: Stephan Gerhold Reviewed-by: Linus Walleij Reviewed-by: Rob Herring Link: https://lore.kernel.org/r/20201203131242.44397-2-stephan@gerhold.net Signed-off-by: Dmitry Torokhov --- .../devicetree/bindings/input/cypress,tm2-touchkey.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml index 90d4def83182..52dca8b64081 100644 --- a/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml +++ b/Documentation/devicetree/bindings/input/cypress,tm2-touchkey.yaml @@ -37,6 +37,11 @@ properties: vcc-supply: description: Optional regulator for MCU, 1.8V-3.3V (depending on MCU). + vddio-supply: + description: | + Optional regulator that provides digital I/O voltage, + e.g. for pulling up the interrupt line or the I2C pins. + linux,keycodes: minItems: 1 maxItems: 4