Re: Powering OMAP's pins

[Tomi Valkeinen <tomi.valkeinen@ti.com>]

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On Tue, 2012-09-25 at 08:38 -0700, Tony Lindgren wrote:
> * Tomi Valkeinen <tomi.valkeinen@ti.com> [120925 03:22]:
> > Hi Tony,
> > 
> > Each pin of OMAP requires a particular power to be enabled for the pin
> > to function (Ball Characteristics table from data manual). Is there a
> > plan how this is managed with pinctrl? Currently each driver needs to
> > make sure the correct regulators are enabled for the pins it uses, which
> > is platform specific and messy.
> > 
> > As a driver maintainer, I would wish that the pins would just get
> > enabled automatically when I call pm_runtime_get()...
> 
> Hmm can you clarify a bit what exactly do you want to do there
> with pm_runtime_get()? Call the regulator framework?

Well, I'm not very familiar with pinctrl, but if I've understood right,
a set of pins are assigned to a driver in DT data (or wherever, that's
not relevant). Those pins should be automatically configured and enabled
when the driver uses pm_runtime_get() to enable its hardware.

And if I've also understood right, the pinctrl discussions related to
omap have only dealt with pin muxing itself. But that's not enough to
get the pin functional, but the relevant regulator needs to be enabled
also.

So when I call pm_runtime_get in the omapdss driver, I imagine that the
runtime PM and pinctrl would together handle muxing the pins for
omapdss's use, and also enable the relevant regulators to make the pins
usable.

 Tomi


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