[PATCH/RFC 2/3] ethernet: add a PHY reset GPIO DT binding to sh_eth
Guennadi Liakhovetski
g.liakhovetski at gmx.de
Mon Jul 8 20:49:47 EST 2013
Hi Jason
Sorry for resuming an old thread, but I'd like to get this solved
eventually.
On Fri, 25 Jan 2013, Jason Gunthorpe wrote:
> On Fri, Jan 25, 2013 at 11:34:55AM +0100, Guennadi Liakhovetski wrote:
>
> > > Is there no need to reset the phy at runtime ?
> >
> > No idea, I'm not developing the driver, I'm just porting one specific
> > feature from one API to another with no functional changes (apart from
> > postponing setting the GPIO).
>
> Generally Linux relies on resetting the phy via the inband MDIO method,
> which is what Linux does. It is pretty much never required to reset
> via the hard pin - but you do need to generate a robust reset edge on
> the reset pin once after power up.
This all sounds good. So, is there a preferred way to do that? Where in
the ethernet framework would you propose to hook up such a reset edge
generation?
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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