linux-kernel - Re: [PATCH net-next 1/2] dt-bindings: net: tja11xx: add nxp,refclk

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Date:   Fri, 19 Aug 2022 12:14:01 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     wei.fang@....com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, andrew@...n.ch,
        f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] dt-bindings: net: tja11xx: add nxp,refclk_in
 property

On 19/08/2022 10:47, wei.fang@....com wrote:
> From: Wei Fang <wei.fang@....com>
> 
> TJA110x REF_CLK can be configured as interface reference clock
> intput or output when the RMII mode enabled. This patch add the
> property to make the REF_CLK can be configurable.
> 
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---
>  .../devicetree/bindings/net/nxp,tja11xx.yaml    | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> index d51da24f3505..c51ee52033e8 100644
> --- a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> +++ b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> @@ -31,6 +31,22 @@ patternProperties:
>          description:
>            The ID number for the child PHY. Should be +1 of parent PHY.
>  
> +      nxp,rmii_refclk_in:

No underscores in properties.

> +        type: boolean
> +        description: |
> +          The REF_CLK is provided for both transmitted and receivced data

typo: received

> +          in RMII mode. This clock signal is provided by the PHY and is
> +          typically derived from an external 25MHz crystal. Alternatively,
> +          a 50MHz clock signal generated by an external oscillator can be
> +          connected to pin REF_CLK. A third option is to connect a 25MHz
> +          clock to pin CLK_IN_OUT. So, the REF_CLK should be configured
> +          as input or output according to the actual circuit connection.
> +          If present, indicates that the REF_CLK will be configured as
> +          interface reference clock input when RMII mode enabled.
> +          If not present, the REF_CLK will be configured as interface
> +          reference clock output when RMII mode enabled.
> +          Only supported on TJA1100 and TJA1101.

Then disallow it on other variants.

Shouldn't this be just "clocks" property?


Best regards,
Krzysztof