linux-kernel - Re: [PATCH v2 2/3] dt-bindings: watchdog: fsl-imx: document suspend in wait mode

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Date:   Tue, 25 Oct 2022 09:48:57 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andrej Picej <andrej.picej@...ik.com>,
        linux-watchdog@...r.kernel.org
Cc:     wim@...ux-watchdog.org, linux@...ck-us.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, Anson.Huang@....com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] dt-bindings: watchdog: fsl-imx: document suspend
 in wait mode

On 25/10/2022 03:25, Andrej Picej wrote:
> Property "fsl,suspend-in-wait" suspends watchdog in "WAIT" mode which
> corresponds to Linux's Suspend-to-Idle S0 mode. If this property is not
> set and the device is put into Suspend-to-Idle mode, the watchdog
> triggers a reset after 128 seconds.
> 
> Signed-off-by: Andrej Picej <andrej.picej@...ik.com>
> Reviewed-by: Fabio Estevam <festevam@...il.com>
> ---
> Changes in v2:
>  - add a commit message,
>  - add a list of devices which support this functionality
> ---
>  .../bindings/watchdog/fsl-imx-wdt.yaml        | 22 +++++++++++++++++++
>  1 file changed, 22 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> index fb7695515be1..9289de97859b 100644
> --- a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> @@ -55,6 +55,28 @@ properties:
>        If present, the watchdog device is configured to assert its
>        external reset (WDOG_B) instead of issuing a software reset.
>  
> +  fsl,suspend-in-wait:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      If present, the watchdog device is suspended in WAIT mode
> +      (Suspend-to-Idle). Only supported on following devices:
> +        - "fsl,imx25-wdt",

You need to define such allow/disallow in allOf:if:then, instead. Like
example-schema is doing for foo-supply, just disallow it for some types
or use "if: not: ..."

Best regards,
Krzysztof