Re: [PATCH] pinctrl: sh-pfc: r8a7796: Add group for AVB MDIO and MII pins

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Geert,

On Thursday 20 Apr 2017 12:11:41 Geert Uytterhoeven wrote:
> On Thu, Apr 20, 2017 at 12:02 PM, Laurent Pinchart wrote:
> > On Thursday 20 Apr 2017 11:49:06 Geert Uytterhoeven wrote:
> >> Group the AVB pins into similar groups as found in other sh-pfc drivers.
> >> The pins can not be muxed between functions other than AVB, but their
> >> drive strengths can be controlled.
> >> 
> >> The group avb_mdc containing ADV_MDC and ADV_MDIO is called avb_mdio on
> >> other SoCs.  In pfc-r8a7796 the avb_mdc group already existed and is in
> >> use in DT. Therefore add the ADV_MDIO pin to the existing group instead
> >> of renaming it.
> > 
> > This clearly shows that we need a few kernel releases to test PFC-related
> > code and DT before we can commit to an ABI. How do you think we should
> > handle this ?
> 
> That's a difficult question ;-)
> 
> For now I'd like to treat R-Car M3-W the same as H3.

I still believe we should introduce some kind of unstable period for DT 
bindings, during which they will be merged in mainline but still subject to 
modification. It could just be a few kernel releases.

-- 
Regards,

Laurent Pinchart