Re: [PATCH net-next v1 3/3] net: phy: micrel: add cable test support for KSZ9477-class PHYs

[Andrew Lunn]

On Tue, Jun 10, 2025 at 11:13:54AM +0200, Oleksij Rempel wrote:
> Enable cable test support for KSZ9477-class PHYs by reusing the
> existing KSZ9131 implementation.
> 
> This also adds support for 100Mbit-only PHYs like KSZ8563, which are
> identified as KSZ9477. For these PHYs, only two wire pairs (A and B)
> are active, so the cable test logic limits the pair_mask accordingly.
> 
> Support for KSZ8563 is untested but added based on its register
> compatibility and PHY ID match.
> 
> Tested on KSZ9893 (Gigabit): open and short conditions were correctly
> detected on all four pairs. Fault length reporting is functional and
> varies by pair. For example:
> - 2m cable: open faults reported ~1.2m (pairs B–D), 0.0m (pair A)
> - No cable: all pairs report 0.0m fault length
> 
> Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew