Re: [PATCH v6 3/3] net: phy: micrel: expose KSZ87xx low-loss cable tunables

[Marek Vasut]

On 5/20/26 10:48 AM, Fidelio Lawson wrote:
> Add support for the KSZ87xx low-loss cable PHY tunables in the Micrel
> PHY driver by implementing get_tunable and set_tunable callbacks.
>
> These callbacks expose vendor-specific PHY tunables used to control the
> KSZ87xx embedded PHY receiver behavior when operating with short or
> low-loss Ethernet cables. The tunables provide:
>
> - a boolean short-cable preset applying known good settings;
> - an integer LPF bandwidth control;
> - an integer DSP EQ initial value control.
>
> The Micrel PHY driver forwards these tunables via standard phy_read() /
> phy_write() operations, which are virtualized by the KSZ8 DSA driver and
> translated into the appropriate indirect switch register accesses.
>
> Signed-off-by: Fidelio Lawson <fidelio.lawson@xxxxxxxxxx>
Reviewed-by: Marek Vasut <marex@xxxxxxxxxxxx>