linux-kernel - Re: [PATCH] regulator: Start using standard gpios property and deprecate some custom properties

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Message-ID: <20131219132602.GB31886@sirena.org.uk>
Date:	Thu, 19 Dec 2013 13:26:02 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Tony Lindgren <tony@...mide.com>
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Tomasz Figa <t.figa@...sung.com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH] regulator: Start using standard gpios property and
 deprecate some custom properties

On Tue, Dec 17, 2013 at 07:37:27AM -0800, Tony Lindgren wrote:
> * Mark Brown <broonie@...nel.org> [131216 15:39]:

> > No, that's a different thing - the PMIC will typically be able to use
> > some pins as GPIOs so most expose a GPIO controller.  The functions that
> > are an issue here are things like voltage selection, voltage transition
> > completion status, sleep mode, enable control or whatever that may need
> > to be tied to the SoC for interaction (usually not just limited to the

> OK. Maybe the best way to deal with that is to have the driver specific
> regmap (gpiomap? :) configuration describe that? And then the driver
> GPIO configuration is picked up just based on the compatible flags and
> the gpios property?

Possibly.  I'd need to see the resulting code and DTs - I'm not 100%
visualising what's meant here.

> > Oh, OK.  Yes, standardisation of the names has benefits though for some
> > of the features (especially voltage selection) the implementation gets
> > rather chip specific and there are also advantages in having the DT
> > binding correspond to the chip documentation.

> > Things that really are very standard probably ought to be being done by
> > the core anyway (like we've done with all the factoring out of standard
> > voltage map and regmap operations).

> Agreed. And a lot of that can be configured automatically based on the
> compatible property.

Hopefully not even the compatible property - we ought to just be able to
pick standard names for some of the standard functions and just support
them without any effort from drivers at all.

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