From: Pin-yen Lin <treapking@chromium.org>
Date: Fri, 29 Jul 2022 05:32:54 +0000 (+0800)
Subject: arm64: dts: mt8173-elm: Switch to SMC watchdog
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=6ea4696818bf5868b1551119b733f02bee509c00;p=linux.git

arm64: dts: mt8173-elm: Switch to SMC watchdog

Switch to SMC watchdog because we need direct control of HW watchdog
registers from kernel. The corresponding firmware was uploaded in
https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/3405.

Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220729053254.220585-1-treapking@chromium.org
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
---

diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
index 5e24c34696ed..d452cab28c67 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
@@ -149,6 +149,18 @@
 			};
 		};
 	};
+
+	watchdog {
+		compatible = "arm,smc-wdt";
+	};
+};
+
+/*
+ * Disable the original MMIO watch dog and switch to the SMC watchdog, which
+ * operates on the same MMIO.
+ */
+&watchdog {
+	status = "disabled";
 };
 
 &mfg_async {