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Date:   Thu, 20 Oct 2022 21:20:58 -0500
From:   Rob Herring <robh@...nel.org>
To:     Michal Simek <michal.simek@....com>
Cc:     Andy Chiu <andy.chiu@...ive.com>, davem@...emloft.net,
        kuba@...nel.org, michal.simek@...inx.com,
        radhey.shyam.pandey@...inx.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        krzysztof.kozlowski+dt@...aro.org, pabeni@...hat.com,
        edumazet@...gle.com, greentime.hu@...ive.com
Subject: Re: [PATCH net-next 2/2] dt-bindings: add mdio frequency description

On Thu, Oct 20, 2022 at 12:39:46PM +0200, Michal Simek wrote:
> 
> 
> On 10/20/22 11:41, Andy Chiu wrote:
> > CAUTION: This message has originated from an External Source. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email.
> > 
> > 
> > Add a property to set mdio bus frequency at runtime by DT.
> > 
> > Signed-off-by: Andy Chiu <andy.chiu@...ive.com>
> > Reviewed-by: Greentime Hu <greentime.hu@...ive.com>
> > ---
> >   Documentation/devicetree/bindings/net/xilinx_axienet.txt | 3 +++
> >   1 file changed, 3 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/xilinx_axienet.txt b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> > index 1aa4c6006cd0..d78cf402aa2a 100644
> > --- a/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> > +++ b/Documentation/devicetree/bindings/net/xilinx_axienet.txt
> > @@ -43,6 +43,9 @@ Optional properties:
> >                    support both 1000BaseX and SGMII modes. If set, the phy-mode
> >                    should be set to match the mode selected on core reset (i.e.
> >                    by the basex_or_sgmii core input line).
> > +- xlnx,mdio-freq: Define the clock frequency of the MDIO bus. If the property
> > +                 does not pressent on the DT, then the mdio driver would use
> > +                 the default 2.5 MHz clock, as mentioned on 802.3 spc.
> 
> Isn't it better to specify it based on ccf description. It means &clk and
> used clock framework to find value?

Or use 'bus-frequency' which IIRC is defined for MDIO.

Rob

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