linux-kernel - Re: [PATCH v2 net-next 1/2] dt-bindings: net: tja11xx: add "nxp,rmii-refclk-out" property

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Message-ID: <20241009151223.GA522364-robh@kernel.org>
Date: Wed, 9 Oct 2024 10:12:23 -0500
From: Rob Herring <robh@...nel.org>
To: Wei Fang <wei.fang@....com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, krzk+dt@...nel.org, conor+dt@...nel.org,
	andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
	andrei.botila@....nxp.com, linux@...linux.org.uk,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH v2 net-next 1/2] dt-bindings: net: tja11xx: add
 "nxp,rmii-refclk-out" property

On Tue, Oct 08, 2024 at 03:07:07PM +0800, Wei Fang wrote:
> Per the RMII specification, the REF_CLK is sourced from MAC to PHY
> or from an external source. But for TJA11xx PHYs, they support to
> output a 50MHz RMII reference clock on REF_CLK pin. Previously the
> "nxp,rmii-refclk-in" was added to indicate that in RMII mode, if
> this property is present, REF_CLK is input to the PHY, otherwise
> it is output. This seems inappropriate now. Because according to
> the RMII specification, the REF_CLK is originally input, so there
> is no need to add an additional "nxp,rmii-refclk-in" property to
> declare that REF_CLK is input.
> 
> Unfortunately, because the "nxp,rmii-refclk-in" property has been
> added for a while, and we cannot confirm which DTS use the TJA1100
> and TJA1101 PHYs, changing it to switch polarity will cause an ABI
> break. But fortunately, this property is only valid for TJA1100 and
> TJA1101. For TJA1103/TJA1104/TJA1120/TJA1121 PHYs, this property is
> invalid because they use the nxp-c45-tja11xx driver, which is a
> different driver from TJA1100/TJA1101. Therefore, for PHYs using
> nxp-c45-tja11xx driver, add "nxp,rmii-refclk-out" property to
> support outputting RMII reference clock on REF_CLK pin.
> 
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---
> V2 changes:
> 1. Change the property name from "nxp,reverse-mode" to
> "nxp,phy-output-refclk".
> 2. Simplify the description of the property.
> 3. Modify the subject and commit message.
> V3 changes:
> 1. Keep the "nxp,rmii-refclk-in" property for TJA1100 and TJA1101.
> 2. Rephrase the commit message and subject.
> V3 changes:
> 1. Change the property name from "nxp,phy-output-refclk" to
> "nxp,rmii-refclk-out", which means the opposite of "nxp,rmii-refclk-in".
> 2. Refactor the patch after fixing the original issue with this YAML.
> ---
>  .../devicetree/bindings/net/nxp,tja11xx.yaml   | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> index a754a61adc2d..1e688c7a497d 100644
> --- a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> +++ b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
> @@ -62,6 +62,24 @@ allOf:
>              reference clock output when RMII mode enabled.
>              Only supported on TJA1100 and TJA1101.
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - ethernet-phy-id001b.b010
> +              - ethernet-phy-id001b.b013
> +              - ethernet-phy-id001b.b030
> +              - ethernet-phy-id001b.b031
> +
> +    then:
> +      properties:
> +        nxp,rmii-refclk-out:
> +          type: boolean
> +          description: |

Don't need '|' if no formatting.

> +            Enable 50MHz RMII reference clock output on REF_CLK pin. This
> +            property is only applicable to nxp-c45-tja11xx driver.

Reword this to not be about some driver.

> +
>  patternProperties:
>    "^ethernet-phy@[0-9a-f]+$":
>      type: object
> -- 
> 2.34.1
>