linux-kernel - Re: [PATCH v2 2/7] dt-bindings: net: dsa: mediatek,mt7530: fix reset lines

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Message-ID: <20220816205228.GA2709277-robh@kernel.org>
Date:   Tue, 16 Aug 2022 14:52:28 -0600
From:   Rob Herring <robh@...nel.org>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Luiz Angelo Daros de Luca <luizluca@...il.com>,
        Sander Vanheule <sander@...nheule.net>,
        René van Dorst <opensource@...rst.com>,
        Daniel Golle <daniel@...rotopia.org>, erkin.bozoglu@...ont.com,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] dt-bindings: net: dsa: mediatek,mt7530: fix reset
 lines

On Sat, Aug 13, 2022 at 06:44:10PM +0300, Arınç ÜNAL wrote:
> - Fix description of mediatek,mcm. mediatek,mcm is not used on MT7623NI.
> - Add description for reset-gpios.
> - Invalidate reset-gpios if mediatek,mcm is used.
> - Invalidate mediatek,mcm if the compatible device is mediatek,mt7531.
> - Require mediatek,mcm for the described MT7621 SoCs as the compatible
> string is only used for MT7530 which is a part of the multi-chip module.

The commit message should answer 'why is this change needed/wanted?' not 
'what changed'. I can read the diff to see what changed.

d> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
>  .../bindings/net/dsa/mediatek,mt7530.yaml     | 31 +++++++++++++++++--
>  1 file changed, 28 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> index edf48e917173..4c99266ce82a 100644
> --- a/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/mediatek,mt7530.yaml
> @@ -110,11 +110,15 @@ properties:
>    mediatek,mcm:
>      type: boolean
>      description:
> -      if defined, indicates that either MT7530 is the part on multi-chip
> -      module belong to MT7623A has or the remotely standalone chip as the
> -      function MT7623N reference board provided for.
> +      Used for MT7621AT, MT7621DAT, MT7621ST and MT7623AI SoCs which the MT7530
> +      switch is a part of the multi-chip module.
>  
>    reset-gpios:
> +    description:
> +      GPIO to reset the switch. Use this if mediatek,mcm is not used.
> +      This property is optional because some boards share the reset line with
> +      other components which makes it impossible to probe the switch if the
> +      reset line is used.
>      maxItems: 1
>  
>    reset-names:
> @@ -165,6 +169,9 @@ allOf:
>        required:
>          - mediatek,mcm
>      then:
> +      properties:
> +        reset-gpios: false
> +
>        required:
>          - resets
>          - reset-names
> @@ -182,6 +189,24 @@ allOf:
>          - core-supply
>          - io-supply
>  
> +  - if:
> +      properties:
> +        compatible:
> +          items:
> +            - const: mediatek,mt7531
> +    then:
> +      properties:
> +        mediatek,mcm: false
> +
> +  - if:
> +      properties:
> +        compatible:
> +          items:
> +            - const: mediatek,mt7621
> +    then:
> +      required:
> +        - mediatek,mcm
> +
>  unevaluatedProperties: false
>  
>  examples:
> -- 
> 2.34.1
> 
>