linux-kernel - Re: [PATCH v2 2/3] arm64: dts: ti: Add reserved memory for watchdog

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Date:   Tue, 11 Jul 2023 11:24:04 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     huaqian.li@...mens.com, 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
Subject: Re: [PATCH v2 2/3] arm64: dts: ti: Add reserved memory for watchdog

On 11/07/2023 11:17, 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>
> ---
>  arch/arm64/boot/dts/ti/k3-am65-iot2050-common.dtsi | 11 +++++++++++
>  1 file changed, 11 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..77380e52a334 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 0x00001000>;
> +			no-map;
> +		};
>  	};
>  
>  	leds {
> @@ -718,3 +724,8 @@ &mcu_r5fss0_core1 {
>  			<&mcu_r5fss0_core1_memory_region>;
>  	mboxes = <&mailbox0_cluster1>, <&mbox_mcu_r5fss0_core1>;
>  };
> +
> +&mcu_rti1 {
> +	reg = <0x0 0x40610000 0x0 0x100>,
> +	      <0x0 0xa2200000 0x0 0x1000>;

That's a total mess. reserved memory and IO address space. Nope.



Best regards,
Krzysztof