On 7/30/19 10:55 PM, Tao Ren wrote: > On 7/30/19 7:34 PM, Andrew Lunn wrote: >>> Hi Andrew, >>> >>> The BCM54616S PHY on my machine is connected to a BCM5396 switch chip over >>> backplane (1000Base-KX). >> >> Ah, that is different. So the board is using it for RGMII to 1000Base-KX? >> >> phy-mode is about the MAC-PHY link. So in this case RGMII. > > Yes. It's RGMII to 1000Base-KX. > >> There is no DT way to configure the PHY-Switch link. However, it >> sounds like you have the PHY strapped so it is doing 1000BaseX on the >> PHY-Switch link. So do you actually need to configure this? > > The PHY is strapped in RGMII-Fiber Mode (the term used in datasheet), but > besides 1000BaseX, 100Base-FX is also supported in this mode. > The datasheet doesn't say which link type (1000BaseX or 100Base-FX) is active > after reset and I cannot find a way to auto-detect the link type, either.
I found bit 0 of 100-FX control register can be used to detect PHY-switch link type (means DT is not needed). Will run more testing and send out v2 patch soon. Thank you all for the input and help. Cheers, Tao
