linux-kernel - [PATCH] arm64: dts: mt8195: change watchdog reset boot flow

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Date:   Mon,  7 Aug 2023 08:58:12 +0000
From:   Hsin-Te Yuan <yuanhsinte@...omium.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Hsin-Te Yuan <yuanhsinte@...gle.com>
Subject: [PATCH] arm64: dts: mt8195: change watchdog reset boot flow

The external output reset signal was originally disabled and sent from
firmware. However, an unfixed bug in the firmware prevents the signal
from being sent, causing the device to fail to boot. To fix this, enable
external output reset signal to allow the device to reboot normally.

Signed-off-by: Hsin-Te Yuan <yuanhsinte@...gle.com>
---

 arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index 37a3e9de90ff7..5dc4214e1840b 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -1147,6 +1147,10 @@ &uart0 {
 	status = "okay";
 };
 
+&watchdog {
+	/delete-property/ mediatek,disable-extrst;
+};
+
 &xhci0 {
 	status = "okay";
 
-- 
2.41.0.585.gd2178a4bd4-goog