Am 15.07.24 um 20:12 schrieb Andrew Lunn: > On Mon, Jul 15, 2024 at 07:47:30PM +0200, Josua Mayer wrote: >> Armada 38x has 3x USB-2.0 utmi phys. They are almost identical to the 2x >> utmi phys on armada 8k. >> >> Add descriptions for all 3 phy ports. >> >> Also add a syscon node covering just the usb configuration registers. >> Armada 8K have a syscon node covering configuration registers for >> various functions including pinmux, woith dirvers using syscon framework > woith -> with > >> for register access. >> >> Armada 388 has various drivers directly claiming some of those >> configuration registers. Hence a similar syscon node would compete for >> resources with these drivers. > Do these drivers make exclusive use of these registers? Or are > multiple drivers using the same registers and you need something to > mediate in order to have atomic access? On Armada 38x these drivers exclusively use their own registers. I suspect armada 8k was trying to avoid declaring lots of tiny ranges, by using a syscon node. The syscon registers accessed by cp110-utmi driver are exclusively for usb and not accessed elsewhere. > > In the old days, a register space could be mapped into multiple > drivers, so long as all the drivers agreed to it. There are probably > orion5x, kirkwood era mvebu drivers doing this. > > Andrew
