From: Michael Walle <michael@xxxxxxxx> Date: Mon, 20 Apr 2020 20:21:12 +0200 > The Broadcom BCM54140 is a Quad SGMII/QSGMII Copper/Fiber Gigabit > Ethernet transceiver. > > This also adds support for tunables to set and get downshift and > energy detect auto power-down. > > The PHY has four ports and each port has its own PHY address. > There are per-port registers as well as global registers. > Unfortunately, the global registers can only be accessed by reading > and writing from/to the PHY address of the first port. Further, > there is no way to find out what port you actually are by just > reading the per-port registers. We therefore, have to scan the > bus on the PHY probe to determine the port and thus what address > we need to access the global registers. > > Signed-off-by: Michael Walle <michael@xxxxxxxx> Applied.
