linux-kernel - Re: [PATCH RFC net-next 2/3] dt-bindings: net: mscc-miim: add clock and clock-frequency

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Date:   Thu, 31 Mar 2022 22:05:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Michael Walle <michael@...le.cc>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 2/3] dt-bindings: net: mscc-miim: add clock
 and clock-frequency

On 31/03/2022 17:14, Michael Walle wrote:
> Add the (optional) clock input of the MDIO controller and indicate that
> the common clock-frequency property is supported. The driver can use it
> to set the desired MDIO bus frequency.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  Documentation/devicetree/bindings/net/mscc,miim.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/mscc,miim.yaml b/Documentation/devicetree/bindings/net/mscc,miim.yaml
> index b52bf1732755..e9e8ddcdade9 100644
> --- a/Documentation/devicetree/bindings/net/mscc,miim.yaml
> +++ b/Documentation/devicetree/bindings/net/mscc,miim.yaml
> @@ -32,6 +32,11 @@ properties:
>  
>    interrupts: true
>  
> +  clocks:
> +    maxItems: 1
> +
> +  clock-frequency: true

This looks unusual clock-frequency is usually for clock providers but
this is a consumer, so it is not a common frequency here. You mention
that "driver can use it", so it's not a hardware description but some
feature for the driver. We have this already - use assigned-clock* in
your DTS.

Best regards,
Krzysztof