Re: [PATCH v5 net-next 1/2] dt-bindings: net: tja11xx: add "nxp,rmii-refclk-out" property

["Rob Herring (Arm)" <robh@kernel.org>]

On Thu, 10 Oct 2024 14:19:43 +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 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@nxp.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.
> V4 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.
> V5 changes:
> 1. Reword the description of "nxp,rmii-refclk-out" property.
> ---
>  .../devicetree/bindings/net/nxp,tja11xx.yaml     | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>