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The panel controller MCU needs an external power rail to be supplied before any I2C communication can take place. Signed-off-by: Shashank Maurya --- .../regulator/raspberrypi,7inch-touchscreen-panel-regulator-v2.yaml | 5 +++++ 1 file changed, 5 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..a6195e53be16 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: @@ -43,6 +46,7 @@ required: - gpio-controller - "#gpio-cells" - "#pwm-cells" + - vcc-supply examples: - | @@ -55,6 +59,7 @@ examples: gpio-controller; #gpio-cells = <2>; #pwm-cells = <3>; + vcc-supply = <&vcc_reg>; }; }; -- 2.34.1