linux-kernel - Re: [PATCH v4 2/3] dt-bindings: watchdog: fsl-imx: document suspend in wait mode

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Date:   Tue, 31 Jan 2023 09:42:09 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Andrej Picej <andrej.picej@...ik.com>
Cc:     linux-watchdog@...r.kernel.org, wim@...ux-watchdog.org,
        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 v4 2/3] dt-bindings: watchdog: fsl-imx: document suspend
 in wait mode

On Fri, Nov 04, 2022 at 08:03:57AM +0100, 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>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> Changes in v4:
>  - combine allOf, reorder allOf so it follows example-schema, drop the
>    quotes around 'watchdog.yaml'.
> 
> Changes in v3:
>  - disallow the property for devices which don't support WDW bit
>    functionality with .yaml DTS allOf:if:then scheme.
> 
> Changes in v2:
>  - add a commit message,
>  - add a list of devices which support this functionality
> ---
>  .../bindings/watchdog/fsl-imx-wdt.yaml        | 37 +++++++++++++++++--
>  1 file changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> index fb7695515be1..181f0cc5b5bd 100644
> --- a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
> @@ -9,9 +9,6 @@ title: Freescale i.MX Watchdog Timer (WDT) Controller
>  maintainers:
>    - Anson Huang <Anson.Huang@....com>
>  
> -allOf:
> -  - $ref: "watchdog.yaml#"
> -
>  properties:
>    compatible:
>      oneOf:
> @@ -55,11 +52,45 @@ 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 certain devices.
> +
>  required:
>    - compatible
>    - interrupts
>    - reg
>  
> +allOf:
> +  - $ref: watchdog.yaml#
> +  - if:
> +      not:
> +        properties:
> +          compatible:
> +            contains:
> +              enum:
> +                - fsl,imx25-wdt
> +                - fsl,imx35-wdt
> +                - fsl,imx50-wdt
> +                - fsl,imx51-wdt
> +                - fsl,imx53-wdt
> +                - fsl,imx6q-wdt
> +                - fsl,imx6sl-wdt
> +                - fsl,imx6sll-wdt
> +                - fsl,imx6sx-wdt
> +                - fsl,imx6ul-wdt
> +                - fsl,imx7d-wdt
> +                - fsl,imx8mm-wdt
> +                - fsl,imx8mn-wdt
> +                - fsl,imx8mp-wdt
> +                - fsl,imx8mq-wdt
> +                - fsl,vf610-wdt
> +    then:
> +      properties:
> +        fsl,suspend-in-wait: false
> +
>  unevaluatedProperties: false
>  
>  examples: