Re: [PATCH net-next 5/5] net: mdio: bcm-unimac: implement timestamped MDIO writes

[Florian Fainelli]

On 10/12/26 06:21, Nicolai Buchwitz wrote:
> Hi Andrew
>
> On 12.10.2026 13:51, Andrew Lunn wrote:
>
> > [...]
>
> > > I've put together 3 patches, which do the clock plumbing:
> > > https://github.com/nbuchwitz/linux/commits/devel/bcm2711-gisb-clk/
> >
> > It would be nice to extend this and set the divider based on this to
> > give 2.5Mhz, as required by 802.3, as the default. Allow boards to
> > override this using the clock-frequency property.

Regarding the choice of the GISB clock to feed it into the MDIO clock 
input, that's something for Raspberry Pi to comment on because I vividly 
remember we did something different for 7211 and used a 250MHz clock in 
the interest of being identical to the other STB chips. Your changes do 
look correct however.

> Sure, as a net-next follow-up once James's clock lookup is in, plus a
> binding tweak since it currently promises hardware defaults?
>
> Only BCM2711 would notice for now, 10 MHz down to 2.5. Both Pi PHYs do
> 12.5 MHz and the slower bus mainly hurts the PTP path, so I'd set
> clock-frequency = <10000000> in bcm2711-rpi.dtsi to keep what the
> boards do today. Florian, ok?

Works for me if it gets us what James want as well, thanks Nicolai!
--
Florian