From 359ed24a0dd3802e703ec8071dc3b6ed446de5f0 Mon Sep 17 00:00:00 2001 From: Fei Shao Date: Wed, 24 May 2023 11:42:36 +0800 Subject: [PATCH] dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend" property We observed that on Chromebook device Steelix, if Goodix GT7375P touchscreen is powered in suspend (because, for example, it connects to an always-on regulator) and with the reset GPIO asserted, it will introduce about 14mW power leakage. To address that, we add this property to skip reset during suspend. If it's set, the driver will stop asserting the reset GPIO during power-down. Refer to the comments in the driver for details. Signed-off-by: Fei Shao Suggested-by: Jeff LaBundy Reviewed-by: Douglas Anderson Reviewed-by: Matthias Brugger Reviewed-by: Jeff LaBundy Acked-by: Rob Herring Signed-off-by: Jiri Kosina --- Documentation/devicetree/bindings/input/goodix,gt7375p.yaml | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml index ce18d7d..1edad1d 100644 --- a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml +++ b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml @@ -43,6 +43,15 @@ properties: itself as long as it allows the main board to make signals compatible with what the touchscreen is expecting for its IO rails. + goodix,no-reset-during-suspend: + description: + Set this to true to enforce the driver to not assert the reset GPIO + during suspend. + Due to potential touchscreen hardware flaw, back-powering could happen in + suspend if the power supply is on and with active-low reset GPIO asserted. + This property is used to avoid the back-powering issue. + type: boolean + required: - compatible - reg -- 2.7.4