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@xxxxxxx> > --- > 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 >
