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Subject[PATCH v5] arm64: dts: mt8173-elm: Switch to SMC watchdog
Date
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>
---

Changes in v5:
- Remove redundant new line.

Changes in v4:
- Rename the watchdog node (smc_watchdog -> watchdog)
- Correct the patch summary (mt8173-oak -> mt8173-elm)

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 | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
index e21feb85d822..abe3140cfcc6 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173-elm.dtsi
@@ -161,6 +161,18 @@ hdmi_connector_in: endpoint {
};
};
};
+
+ 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 {
--
2.37.1.455.g008518b4e5-goog
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