linux-kernel - Re: [PATCH 1/3] dt-bindings: watchdog: add Marvell AC5 watchdog

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Date:   Thu, 14 Dec 2023 16:13:36 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Elad Nachman <enachman@...vell.com>, wim@...ux-watchdog.org,
        linux@...ck-us.net, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        gregory.clement@...tlin.com, chris.packham@...iedtelesis.co.nz,
        andrew@...n.ch, fu.wei@...aro.org, Suravee.Suthikulpanit@....com,
        al.stone@...aro.org, timur@...eaurora.org,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     cyuval@...vell.com
Subject: Re: [PATCH 1/3] dt-bindings: watchdog: add Marvell AC5 watchdog

On 14/12/2023 16:04, Elad Nachman wrote:
> From: Elad Nachman <enachman@...vell.com>
> 
> Add definitions and examples for Marvell AC5 variant
> of the sbsa watchdog.
> Marvell variant requires more memory definitions,
> since the initialization is more complex, and involves
> several register sets.

Please wrap commit message according to Linux coding style / submission
process (neither too early nor over the limit):
https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597

> 
> Signed-off-by: Elad Nachman <enachman@...vell.com>
> ---
>  .../bindings/watchdog/arm,sbsa-gwdt.yaml      | 52 ++++++++++++++++++-
>  1 file changed, 50 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml b/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml
> index aa804f96acba..331e9aa7c2f7 100644
> --- a/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml
> +++ b/Documentation/devicetree/bindings/watchdog/arm,sbsa-gwdt.yaml
> @@ -20,12 +20,17 @@ allOf:
>  
>  properties:
>    compatible:
> -    const: arm,sbsa-gwdt
> +    enum:
> +      - arm,sbsa-gwdt
> +      - marvell,ac5-wd
>  
>    reg:
>      items:
>        - description: Watchdog control frame
>        - description: Refresh frame
> +      - description: Marvell CPU control frame
> +      - description: Marvell Management frame
> +      - description: Marvell reset control unit frame

You just broke all the users... I doubt this was tested on ARM platforms.

>  
>    interrupts:
>      description: The Watchdog Signal 0 (WS0) SPI (Shared Peripheral Interrupt)
> @@ -39,12 +44,55 @@ required:
>  unevaluatedProperties: false
>  
>  examples:
> +  # First example is for generic ARM one
> +  # Next examples are for Marvell.

One new example could be enough... but if it differs with one property,
also not that much of benefit.

> +  # They are organized as three sets:
> +  # first set is for global watchdog, then CPU core #0 private watchdog,
> +  # and finally CPU core #1 private watchdog
> +  # Examples are given for AC5 or Ironman. For AC5X SOC, the last
> +  # reg item's low address (0x840F8000) should be replaced with 0x944F8000
>    - |
>      watchdog@...40000 {
>          compatible = "arm,sbsa-gwdt";
>          reg = <0x2a440000 0x1000>,
> -              <0x2a450000 0x1000>;
> +              <0x2a450000 0x1000>,
> +              <0x0 0x0>,
> +              <0x0 0x0>,
> +              <0x0 0x0>;

No, drop.

>          interrupts = <0 27 4>;
>          timeout-sec = <30>;
>      };
> +  - |
> +    watchdog@...16000 {
> +        compatible = "marvell,ac5-wd";
> +        reg = <0x80216000 0x1000>,
> +              <0x80215000 0x1000>,
> +              <0x80210000 0x1000>,
> +              <0x7f900000 0x1000>,
> +              <0x840F8000 0x1000>;
> +        interrupts = <0 124 4>;

Use proper defines.

> +        timeout-sec = <30>;
> +    };
> +  - |
> +    watchdog@...12000 {

Drop example.

> +        compatible = "marvell,ac5-wd";
> +        reg = <0x80212000 0x1000>,
> +              <0x80211000 0x1000>,
> +              <0x80210000 0x1000>,
> +              <0x7f900000 0x1000>,
> +              <0x840F8000 0x1000>;
> +        interrupts = <0 122 4>;
> +        timeout-sec = <30>;
> +    };
> +  - |
> +    watchdog@...14000 {

Drop example.

Best regards,
Krzysztof