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

[Guennadi Liakhovetski <g.liakhovetski@gmx.de>]

On Mon, 29 Jul 2013, Pawel Moll wrote:

> On Fri, 2013-07-26 at 18:10 +0100, Stephen Warren wrote:
> > > +- uhs-sdr12: the host supports UHS SDR12 mode
> > > +- uhs-sdr25: the host supports UHS SDR25 mode
> > > +- uhs-sdr50: the host supports UHS SDR50 mode
> > > +- uhs-sdr104: the host supports UHS SDR104 mode
> > > +- uhs-ddr50: the host supports UHS DDR50 mode
> > > +- ddr-1v2: the host can support DDR, using 1.2V VccQ
> > > +- ddr-1v8: the host can support DDR, using 1.8V VccQ
> 
> I understand that they are equivalent of the mmc caps #defines. Having
> absolutely no UHS knowledge (nor access to the spec) I'm just wondering
> if some of them couldn't be derived from the "environment", being the
> way the host is wired up?

Indeed it would be good to get a reply from someone with access to the 
specs.

Thanks
Guennadi

> An example would be the classic OCR VDD fields - the voltage range bits
> are taken from the regulator "vmmc" supply (see
> mmc_regulator_get_supply()).
> 
> Of course I this may be completely wrong approach here...
> 
> Pawel

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