linux-kernel - Re: [PATCH v3 4/6] dt-bindings: net: sun7i-gmac: Add syscon support

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Message-ID: <20200430150046.theqniqcrfjiokyo@gilmour.lan>
Date:   Thu, 30 Apr 2020 17:00:46 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Priit Laes <plaes@...es.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 4/6] dt-bindings: net: sun7i-gmac: Add syscon support

On Thu, Apr 30, 2020 at 02:57:00PM +0300, Priit Laes wrote:
> Now that driver supports syscon-based regmap access, document also the
> devicetree binding.
> 
> Signed-off-by: Priit Laes <plaes@...es.org>
> ---
>  .../bindings/net/allwinner,sun7i-a20-gmac.yaml    | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.yaml b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.yaml
> index 703d0d886884..c41d7c598c19 100644
> --- a/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.yaml
> +++ b/Documentation/devicetree/bindings/net/allwinner,sun7i-a20-gmac.yaml
> @@ -29,17 +29,26 @@ properties:
>    clocks:
>      items:
>        - description: GMAC main clock
> +
> +      # Deprecated
>        - description: TX clock
>  
>    clock-names:
>      items:
>        - const: stmmaceth
> +
> +      # Deprecated
>        - const: allwinner_gmac_tx

That would be deprecated: true

Also, you still require to have two clocks here?

>  
>    phy-supply:
>      description:
>        PHY regulator
>  
> +  syscon:
> +    $ref: /schemas/types.yaml#definitions/phandle
> +    description:
> +      Phandle to the device containing the GMAC clock register
> +
>  required:
>    - compatible
>    - reg
> @@ -48,6 +57,7 @@ required:
>    - clocks
>    - clock-names
>    - phy-mode
> +  - syscon

You can't do that though, this changes the binding in a non-backward compatible
way

I guess you could add an if clause to require it if clocks has a single member.

Maxime

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