net: dsa: mxl-gsw1xx: force internal PHYs into a known reset state

When bootstrapped with PS_NOWAIT = 0 the internal PHYs stay held in
reset, so the driver only worked with PS_NOWAIT = 1 where they are
released automatically.

Add a ->setup() hook, run before the MDIO bus is registered so PHY IDs
are readable during the bus scan, that programs the RST_REQ PHY reset
lines: release the PHYs of used ports and hold all other internal PHYs
in reset. Driving both directions yields the same state regardless of
the PS_NOWAIT bootstrap and keeps unused PHYs from staying powered.

A single 300ms settle delay is applied only when at least one PHY is
released.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Link: https://patch.msgid.link/20260929125143.2890583-1-alexander.sverdlin@siemens.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions