[PATCH RFC net-next 4/4] net: mtk_eth_soc: note interface modes not set in supported_interfaces

[Daniel Golle]

On Tue, Mar 07, 2023 at 02:04:59PM +0000, Russell King (Oracle) wrote:
> On Tue, Mar 07, 2023 at 01:25:23PM +0000, Daniel Golle wrote:
> > A quick grep through the device trees of the more than 650 ramips and
> > mediatek boards we support in OpenWrt has revealed that *none* of them
> > uses either reduced-MII or reverse-MII PHY modes. I could imaging that
> > some more specialized ramips boards may use the RMII 100M PHY mode to
> > connect with exotic PHYs for industrial or automotive applications
> > (think: for 100BASE-T1 PHY connected via RMII). I have never seen or
> > touched such boards, but there are hints that they do exist.
> > 
> > For reverse-MII there are cases in which the Ralink SoC (Rt305x, for
> > example) is used in iNIC mode, ie. connected as a PHY to another SoC,
> > and running only a minimal firmware rather than running Linux. Due to
> > the lack of external DRAM for the Ralink SoC on this kind of boards,
> > the Ralink SoC there will anyway never be able to boot Linux.
> > I've seen this e.g. in multimedia devices like early WiFi-connected
> > not-yet-so-smart TVs.
> > 
> > Tl;dr: I'd drop them. If anyone really needs them, it would be easy to
> > add them again and then also add them to the phylink capability mask.
> 
> Thanks! That seems to be well reasoned. Would you have any objection to
> using the above as part of the commit message removing these modes?

Sure, go ahead, sounds good to me.