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From:   Fei Shao <fshao@chromium.org>
To:     Benjamin Tissoires <benjamin.tissoires@redhat.com>,
        Douglas Anderson <dianders@chromium.org>,
        Rob Herring <robh+dt@kernel.org>
Cc:     linux-mediatek <linux-mediatek@lists.infradead.org>,
        Fei Shao <fshao@chromium.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        devicetree@vger.kernel.org, linux-input@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] dt-bindings: input: goodix: Add powered-in-suspend property
Date:   Tue, 18 Apr 2023 20:49:51 +0800
Message-ID: <20230418124953.3170028-2-fshao@chromium.org>
In-Reply-To: <20230418124953.3170028-1-fshao@chromium.org>
References: <20230418124953.3170028-1-fshao@chromium.org>
MIME-Version: 1.0
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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@chromium.org>
---

 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
-- 
2.40.0.634.g4ca3ef3211-goog