linux-kernel - Re: [PATCH 04/10] dt-bindings: memory: mt7621: add syscon as compatible string

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Date:   Wed, 14 Sep 2022 10:14:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     Arınç ÜNAL <arinc.unal@...nc9.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        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>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        erkin.bozoglu@...ont.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,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH 04/10] dt-bindings: memory: mt7621: add syscon as
 compatible string

On Wed, Sep 14, 2022 at 11:54:45AM +0300, Arınç ÜNAL wrote:
> Add syscon as a constant string on the compatible property as it's required
> for the SoC to work. Update the example accordingly.

It's not required. It's required to automagically create a regmap. That 
can be done yourself as well. The downside to adding 'syscon' is it 
requires a DT update. Maybe that's fine for this platform? I don't know.

> 
> Fixes: 5278e4a181ff ("dt-bindings: memory: add binding for Mediatek's MT7621 SDRAM memory controller")
> Signed-off-by: Arınç ÜNAL <arinc.unal@...nc9.com>
> ---
>  .../bindings/memory-controllers/mediatek,mt7621-memc.yaml   | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml b/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml
> index 85e02854f083..6ccdaf99c778 100644
> --- a/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml
> +++ b/Documentation/devicetree/bindings/memory-controllers/mediatek,mt7621-memc.yaml
> @@ -11,7 +11,9 @@ maintainers:
>  
>  properties:
>    compatible:
> -    const: mediatek,mt7621-memc
> +    items:
> +      - const: mediatek,mt7621-memc
> +      - const: syscon
>  
>    reg:
>      maxItems: 1
> @@ -25,6 +27,6 @@ additionalProperties: false
>  examples:
>    - |
>      memory-controller@...0 {
> -        compatible = "mediatek,mt7621-memc";
> +        compatible = "mediatek,mt7621-memc", "syscon";
>          reg = <0x5000 0x1000>;
>      };
> -- 
> 2.34.1
> 
>