linux-kernel - Re: [PATCH 1/4] dt-bindings: watchdog: aspeed: Add property for WDT SW reset

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Message-ID: <20241007175949.GA1738291-robh@kernel.org>
Date: Mon, 7 Oct 2024 12:59:49 -0500
From: Rob Herring <robh@...nel.org>
To: Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
Cc: patrick@...cx.xyz, wim@...ux-watchdog.org, linux@...ck-us.net,
	krzk+dt@...nel.org, conor+dt@...nel.org, joel@....id.au,
	andrew@...econstruct.com.au, linux-watchdog@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Peter.Yin@...ntatw.com, Patrick_NC_Lin@...ynn.com,
	Bonnie_Lo@...ynn.com, DELPHINE_CHIU@...ynn.com,
	BMC-SW@...eedtech.com
Subject: Re: [PATCH 1/4] dt-bindings: watchdog: aspeed: Add property for WDT
 SW reset

On Mon, Oct 07, 2024 at 02:34:05PM +0800, Chin-Ting Kuo wrote:
> Add "aspeed,restart-sw" property to distinguish normal WDT
> reset from system restart triggered by SW consciously.
> 
> Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
> ---
>  .../bindings/watchdog/aspeed,ast2400-wdt.yaml         | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml b/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml
> index be78a9865584..6cc3604c295a 100644
> --- a/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/aspeed,ast2400-wdt.yaml
> @@ -95,6 +95,17 @@ properties:
>        array with the first word defined using the AST2600_WDT_RESET1_* macros,
>        and the second word defined using the AST2600_WDT_RESET2_* macros.
>  
> +  aspeed,restart-sw:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: >
> +      Normally, ASPEED WDT reset may occur when system hangs or reboot
> +      triggered by SW consciously. However, system doesn't know whether the
> +      restart is triggered by SW consciously since the reset event flag is
> +      the same as normal WDT timeout reset. With this property, SW can
> +      restart the system immediately and directly without wait for WDT
> +      timeout occurs. The reset event flag is also different from the normal
> +      WDT reset. This property is only supported since AST2600 platform.

Why can't this be implicit based on the ast2600 compatible string?

Rob