On Mon, Jan 16, 2023 at 10:16:34AM +0100, Jerome Brunet wrote: > Add support for the MDIO multiplexer found in the Amlogic GXL SoC family. > This multiplexer allows to choose between the external (SoC pins) MDIO bus, > or the internal one leading to the integrated 10/100M PHY. > > This multiplexer has been handled with the mdio-mux-mmioreg generic driver > so far. When it was added, it was thought the logic was handled by a > single register. > > It turns out more than a single register need to be properly set. > As long as the device is using the Amlogic vendor bootloader, or upstream > u-boot with net support, it is working fine since the kernel is inheriting > the bootloader settings. Without net support in the bootloader, this glue > comes unset in the kernel and only the external path may operate properly. > > With this driver (and the associated DT update), the kernel no longer relies > on the bootloader to set things up, fixing the problem. Ideally, you should also post an actual user of this driver, i.e. the DT updates. > This has been tested on the aml-s905x-cc (LePotato) for the internal path > and the aml-s912-pc (Tartiflette) for the external path. So these exist in mainline, which is enough for me. Andrew
