Hi Fidelio

On 1.6.2026 13:54, 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.

Reviewed-by: Marek Vasut <redacted>
Signed-off-by: Fidelio Lawson <redacted>
---

[...]

Reviewed-by: Nicolai Buchwitz <redacted>

Thanks
Nicolai