Re: [PATCH RFT 1/2] phylib: add device reset GPIO support

[Sergei Shtylyov]

On 05/13/2016 11:44 PM, Andrew Lunn wrote:

> > > Another issue is that on some boards we have one reset line tied to
> > > multiple PHYs.How do we prevent multiple resets being taking place when each of
> > > the PHYs are registered?
> >
> >    My patch just doesn't address this case -- it's about the
> > individual resets only.
>
> This actually needs to be addresses a layer above. What you have is a
> bus reset, not a device reset.

   No.
   There's simply no such thing as a bus reset for the xMII/MDIO busses, 
there's simply no reset signaling on them. Every device has its own reset 
signal and its own timing requirements.

> So the gpio line is associated to the mdio bus, not a PHY.

   No.

> Either your MDIO driver needs to handle the gpio
> line,  or in __mdio_register(),

   __mdiobus_register(), you mean?

> before it starts looking at the
> children.

   It's basically the same thing.
   The MDIO bus reset is a misconception.

> 	Andrew

MBR, Sergei