linux-kernel - [PATCH v3] arm64: dts: mt8173-oak: Switch to SMC watchdog

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Message-Id: <20220728153913.2652153-1-treapking@chromium.org>
Date:   Thu, 28 Jul 2022 23:39:13 +0800
From:   Pin-yen Lin <treapking@...omium.org>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Eizan Miyamoto <eizan@...omium.org>,
        Evan Benn <evanbenn@...omium.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Pin-yen Lin <treapking@...omium.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: [PATCH v3] arm64: dts: mt8173-oak: 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@...omium.org>
---

Changes in v3:
- Remove /delete-node/ and create a new node for SMC watchdog.

Changes in v2:
- Move the modifications to mt8173-elm.dtsi and add some comments.

 arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
index e21feb85d822..fc8203297bac 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
@@ -161,6 +161,19 @@ hdmi_connector_in: endpoint {
 			};
 		};
 	};
+
+
+	smc_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 {
-- 
2.37.1.359.gd136c6c3e2-goog