linux-kernel - [PATCH RESEND v2] arm64: dts: mt8195-cherry-tomato: change watchdog reset boot flow

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Date: Thu, 28 Dec 2023 18:57:01 +0800
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: Hsin-Te Yuan <yuanhsinte@...omium.org>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH RESEND v2] arm64: dts: mt8195-cherry-tomato: change watchdog reset boot flow

The external output reset signal was originally disabled and sent from
firmware. However, an unfixed bug in the firmware on tomato 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@...omium.org>

---

Changes in v2:
- Limit the effect only on tomato.

---
 arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts | 4 ++++
 arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts | 4 ++++
 arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
index 2d5e8f371b6d..a82d716f10d4 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r1.dts
@@ -23,3 +23,7 @@ &sound {
 &ts_10 {
 	status = "okay";
 };
+
+&watchdog {
+	/delete-property/ mediatek,disable-extrst;
+};
diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
index 2586c32ce6e6..2fe20e0dad83 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r2.dts
@@ -43,3 +43,7 @@ &sound {
 &ts_10 {
 	status = "okay";
 };
+
+&watchdog {
+	/delete-property/ mediatek,disable-extrst;
+};
diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
index f54f9477b99d..dd294ca98194 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry-tomato-r3.dts
@@ -44,3 +44,7 @@ &sound {
 &ts_10 {
 	status = "okay";
 };
+
+&watchdog {
+	/delete-property/ mediatek,disable-extrst;
+};
-- 
2.43.0.472.g3155946c3a-goog