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Message-ID: <f19562fa-a8c6-4870-e413-7593419b800f@gmail.com>
Date: Tue, 18 Apr 2023 20:02:36 +0200
From: Matthias Brugger <matthias.bgg@...il.com>
To: Fei Shao <fshao@...omium.org>,
Benjamin Tissoires <benjamin.tissoires@...hat.com>,
Douglas Anderson <dianders@...omium.org>,
Rob Herring <robh+dt@...nel.org>
Cc: devicetree@...r.kernel.org,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-kernel@...r.kernel.org,
linux-mediatek <linux-mediatek@...ts.infradead.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
linux-input@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: input: goodix: Add powered-in-suspend
property
On 18/04/2023 14:49, Fei Shao wrote:
> 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.
>
> This property is used to indicate that the touchscreen is powered in
> suspend. If it's set, the driver will stop asserting the reset GPIO in
> power-down, and it will do it in power-up instead to ensure that the
> state is always reset after resuming.
>
> Signed-off-by: Fei Shao <fshao@...omium.org>
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> ---
>
> Documentation/devicetree/bindings/input/goodix,gt7375p.yaml | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
> index ce18d7dadae2..942acb286d77 100644
> --- a/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
> +++ b/Documentation/devicetree/bindings/input/goodix,gt7375p.yaml
> @@ -43,6 +43,12 @@ properties:
> itself as long as it allows the main board to make signals compatible
> with what the touchscreen is expecting for its IO rails.
>
> + powered-in-suspend:
> + description:
> + This indicates that the touchscreen is powered in suspend, so the driver
> + will not assert the reset GPIO in power-down to prevent power leakage.
> + type: boolean
> +
> required:
> - compatible
> - reg
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