Re: [PATCH 1/2] mmc: add Device Tree properties for UHS modes

[Pawel Moll <pawel.moll@arm.com>]

On Mon, 2013-07-29 at 12:27 +0100, Guennadi Liakhovetski wrote:
> On Mon, 29 Jul 2013, Pawel Moll wrote:
> 
> > On Mon, 2013-07-29 at 08:18 +0100, Guennadi Liakhovetski wrote:
> > > A short addendum. At least with Renesas SoCs I see the situation in the 
> > > following way: new SoC versions appear relatively frequently. 
> > 
> > What frequency are we talking about? Once per year? Once per month? I'm
> > not trying to be picky, it really makes a difference...
> 
> Definitely not every month - not until now in the mainline at least. I 
> currently count 9 SoCs, added since 2010, which makes about 2-3 SoCs per 
> year.

So this is actually a slower rate that I've faced in my previous life
working for a silicon vendor ;-) And my experience is that the IPs were
different between the SoCs indeed but:

1. Not all of them at the same time (so no extra compatible values for
others).
2. When there was a change it required change in a driver as well (so
adding a compatible value is not an issue).
3. The changes were *completely* unpredictable (so even comprehensive
list of DT properties wouldn't help)

To summarize, count this as another vote for using compatible rather
then "universal & future-proof" set of properties. Unless there is a
very good rationale for it (I'm sure such cases exist)

Thanks!

Pawel