linux-kernel - Re: [PATCH 1/2] dt-bindings: net: fsl,fec: Add TX clock controls

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Date:   Wed, 12 Jul 2023 22:36:35 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Vesa Jääskeläinen 
        <vesa.jaaskelainen@...sala.com>
Cc:     Wei Fang <wei.fang@....com>, Shenwei Wang <shenwei.wang@....com>,
        Clark Wang <xiaoning.wang@....com>,
        NXP Linux Team <linux-imx@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: net: fsl,fec: Add TX clock controls

On 11/07/2023 17:08, Vesa Jääskeläinen wrote:
> With fsl,fec-tx-clock-output one can control if TX clock is routed outside
> of the chip.
> 
> With fsl,fec-tx-clk-as-ref-clock one can select if external TX clock is as
> reference clock.
> 
> Signed-off-by: Vesa Jääskeläinen <vesa.jaaskelainen@...sala.com>
> ---
>  .../devicetree/bindings/net/fsl,fec.yaml          | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/fsl,fec.yaml b/Documentation/devicetree/bindings/net/fsl,fec.yaml
> index b494e009326e..c09105878bc6 100644
> --- a/Documentation/devicetree/bindings/net/fsl,fec.yaml
> +++ b/Documentation/devicetree/bindings/net/fsl,fec.yaml
> @@ -166,6 +166,21 @@ properties:
>      description:
>        If present, indicates that the hardware supports waking up via magic packet.
>  
> +  fsl,fec-tx-clock-output:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      If present, ENETx_TX_CLK output driver is enabled.
> +      If not present, ENETx_TX_CLK output driver is disabled.

Here...

> +
> +  fsl,fec-tx-clk-as-ref-clock:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      If present, gets ENETx TX reference clk from the ENETx_TX_CLK pin. In
> +      this use case, an external OSC provides the clock for both the external
> +      PHY and the internal controller.
> +      If not present, ENETx TX reference clock is driven by ref_enetpllx. This
> +      clock is also output to pins via the IOMUX.ENET_REF_CLKx function.

and here:
In general, Common Clock Framework and its bindings should be used for
handling clock providers and consumers. Why it cannot be used for these
two cases?


Best regards,
Krzysztof