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

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Date:   Fri, 14 Jul 2023 17:52:40 -0500
From:   Nishanth Menon <nm@...com>
To:     <huaqian.li@...mens.com>
CC:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <huaqianlee@...il.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>
Subject: Re: [PATCH v3 2/3] arm64: dts: ti: Add reserved memory for watchdog

On 17:51-20230713, huaqian.li@...mens.com wrote:
> From: Li Hua Qian <huaqian.li@...mens.com>

I guess I should be explicit about this: Lets keep this dts patch as
"DONOTMERGE" in subject line for driver subsystem maintainer (I don't
want a repeat of cpufreq maintainers picking up dts and associated
warnings that are now pending fixes), resubmit at next rc1 and I can
queue up the dts once the maintainers pick up the driver and bindings.

Ref: https://lore.kernel.org/all/20230714084725.27847-1-krzysztof.kozlowski@linaro.org/

> 
> 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
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D