linux-kernel - [PATCH] arm64: dts: mt8173: Power on panel regulator on boot

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Date:   Mon, 17 Apr 2023 20:39:56 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Doug Anderson <dianders@...omium.org>,
        Pin-yen Lin <treapking@...omium.org>
Subject: [PATCH] arm64: dts: mt8173: Power on panel regulator on boot

Add "regulator-boot-on" to "panel_fixed_3v3" to save time on powering
the regulator during boot.  Also add "off-on-delay-us" to the node to
make sure the regulator never violates the panel timing requirements.

Signed-off-by: Pin-yen Lin <treapking@...omium.org>

---

 arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
index d77f6af19065..03d1ab2ca820 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
@@ -96,6 +96,8 @@ panel_fixed_3v3: regulator1 {
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 		enable-active-high;
+		regulator-boot-on;
+		off-on-delay-us = <500000>;
 		gpio = <&pio 41 GPIO_ACTIVE_HIGH>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&panel_fixed_pins>;
-- 
2.40.0.634.g4ca3ef3211-goog