linux-kernel - [PATCH v3 2/3] arm64: dts: ti: Add reserved memory for watchdog

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Date:   Thu, 13 Jul 2023 17:51:26 +0800
From:   huaqian.li@...mens.com
To:     wim@...ux-watchdog.org, linux@...ck-us.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc:     huaqianlee@...il.com, nm@...com, vigneshr@...com,
        kristo@...nel.org, linux-watchdog@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, jan.kiszka@...mens.com,
        baocheng.su@...mens.com, Li Hua Qian <huaqian.li@...mens.com>
Subject: [PATCH v3 2/3] arm64: dts: ti: Add reserved memory for watchdog

From: Li Hua Qian <huaqian.li@...mens.com>

This patch adds a reserved memory for the TI AM65X platform watchdog to
reserve the specific info, triggering the watchdog reset in last boot,
to know if the board reboot is due to a watchdog reset.

Signed-off-by: Li Hua Qian <huaqian.li@...mens.com>
---
 arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
index e26bd988e522..4bb20d493651 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
@@ -63,6 +63,12 @@ rtos_ipc_memory_region: ipc-memories@...00000 {
 			alignment = <0x1000>;
 			no-map;
 		};
+
+		/* To reserve the power-on(PON) reason for watchdog reset */
+		wdt_reset_memory_region: wdt-memory@...00000 {
+			reg = <0x00 0xa2200000 0x00 0x1000>;
+			no-map;
+		};
 	};
 
 	leds {
@@ -718,3 +724,7 @@ &mcu_r5fss0_core1 {
 			<&mcu_r5fss0_core1_memory_region>;
 	mboxes = <&mailbox0_cluster1>, <&mbox_mcu_r5fss0_core1>;
 };
+
+&mcu_rti1 {
+	memory-region = <&wdt_reset_memory_region>;
+};
-- 
2.34.1