linux-kernel - [PATCH] arm64: dts: mediatek: mt8192-asurada: Add off-on-delay-us for pp3300

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Date: Mon, 29 Apr 2024 17:53:31 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Mediatek SoC support),
	linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC support),
	Nícolas F . R . A . Prado <nfraprado@...labora.com>,
	linux-kernel@...r.kernel.org (open list:ARM/Mediatek SoC support),
	Hsin-Te Yuan <yuanhsinte@...omium.org>,
	Pin-yen Lin <treapking@...omium.org>
Subject: [PATCH] arm64: dts: mediatek: mt8192-asurada: Add off-on-delay-us for pp3300_mipibrdg

Set off-on-delay-us to 500000 us for pp3300_mipibrdg to make sure it
complies with the panel sequence. Explicit configuration on the
regulator node is required because mt8192-asurada uses the same power
supply for the panel and the anx7625 DP bridge. So powering on/off the
DP bridge could break the power sequence requirement for the panel.

Fixes: f9f00b1f6b9b ("arm64: dts: mediatek: asurada: Add display regulators")
Signed-off-by: Pin-yen Lin <treapking@...omium.org>

---

 arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
index 7a704246678f..08d71ddf3668 100644
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada.dtsi
@@ -147,6 +147,7 @@ pp3300_mipibrdg: regulator-3v3-mipibrdg {
 		regulator-boot-on;
 		gpio = <&pio 127 GPIO_ACTIVE_HIGH>;
 		vin-supply = <&pp3300_g>;
+		off-on-delay-us = <500000>;
 	};
 
 	/* separately switched 3.3V power rail */
-- 
2.44.0.769.g3c40516874-goog