linux-kernel - [PATCH] arm64: dts: ti: Add reserved memory for watchdog

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Date: Wed, 17 Jan 2024 14:06:56 +0800
From: huaqian.li@...mens.com
To: nm@...com,
	vigneshr@...com,
	kristo@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com,
	baocheng.su@...mens.com,
	Li Hua Qian <huaqian.li@...mens.com>
Subject: [PATCH] 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>
---
The driver and binding have hit the master, which could be found in the
following link.
- watchdog:rit_wdt: Add support for WDIOF_CARDRESET
- dt-bindings: watchdog: ti,rti-wdt: Add support for WDIOF_CARDRESET
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29057cc5bddc785ea0a11534d7ad2546fa0872d3

 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 61a634afaa4f..88321799d468 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi
@@ -75,6 +75,12 @@ 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 {
@@ -1427,6 +1433,10 @@ &mcu_r5fss0_core1 {
 	mboxes = <&mailbox0_cluster1>, <&mbox_mcu_r5fss0_core1>;
 };
 
+&mcu_rti1 {
+	memory-region = <&wdt_reset_memory_region>;
+};
+
 &icssg0_mdio {
 	status = "okay";
 	pinctrl-names = "default";
-- 
2.34.1