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The panel controller MCU is powered from an external power rail, which has to be supplied before any I2C communication can take place. The property is optional so that existing device trees which do not describe the supply remain valid. Signed-off-by: Shashank Maurya --- .../regulator/raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/regulator/raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml b/Documentation/devicetree/bindings/regulator/raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml index 37b9ed371b67..3e2cbcad6490 100644 --- a/Documentation/devicetree/bindings/regulator/raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml +++ b/Documentation/devicetree/bindings/regulator/raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml @@ -35,6 +35,9 @@ properties: const: 3 description: See ../../pwm/pwm.yaml for description of the cell formats. + vcc-supply: + description: Regulator supplying power to the panel controller. + additionalProperties: false required: @@ -55,6 +58,7 @@ examples: gpio-controller; #gpio-cells = <2>; #pwm-cells = <3>; + vcc-supply = <&vcc_reg>; }; }; -- 2.34.1