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Fidelio Lawson
a1ee1b9beb
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 <marex@nabladev.com> Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de> Signed-off-by: Fidelio Lawson <fidelio.lawson@exotec.com> Link: https://patch.msgid.link/20260609-ksz87xx_errata_low_loss_connections-v10-3-9ba4418cf3db@exotec.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>