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

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Date: Fri, 16 Feb 2024 17:48:51 +0100
From: Jan Kiszka <jan.kiszka@...mens.com>
To: huaqian.li@...mens.com, 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, baocheng.su@...mens.com
Subject: Re: [PATCH] arm64: dts: ti: Add reserved memory for watchdog

On 17.01.24 07:06, huaqian.li@...mens.com wrote:
> 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";

Is this not forgotten (now that my IOT2050 series was merged)?

Thanks,
Jan

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