linux-kernel - Re: [PATCH v2 1/4] ARM: dts: omap4-panda: Add USB Host support

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Date:	Wed, 19 Jun 2013 05:27:15 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Benoit Cousson <b-cousson@...com>
Cc:	Roger Quadros <rogerq@...com>, linux-omap@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] ARM: dts: omap4-panda: Add USB Host support

* Benoit Cousson <b-cousson@...com> [130619 03:17]:
> On 06/19/2013 02:46 AM, Tony Lindgren wrote:
> >
> >We have a similar issue with the MMC1 PBIAS. I think in the long run we
> >should expand regulator (and possibly pinctrl) framework(s) to handle
> >comparators. We could just assume that a comparatator is a regulator,
> >and have a comparator binding that just uses the regulator code.
> 
> In the case of pbias, the pinctrl seems to be a much better fit for
> my point of view. pinctrl can handle pin configuration and this is
> what the pbias is in the case of MMC pins.

Well just recently Linus W specifically wanted us to use regulator
framework for the MMC1 PBIAS rather than pinctrl. That's because
from consumer driver point of view, it changes voltage and there's
a delay involved. So I guess no conclusion yet, and it's best to
do stand alone drivers to deal with those that use pinctrl for the
pinctrl specific parts and export it as a regulator for the consumer
devices. That's pretty much along the lines what Roger has done,
except the transceiver could use the pinctrl-single,bits for the
muxing and pinconf.

Regards,

Tony
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