Re: [PATCH/RFC 2/3] ethernet: add a PHY reset GPIO DT binding to sh_eth

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:

quoted

quoted

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
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Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/