linux-kernel - Re: [PATCH] gpiolib: Add support for Wolfson Microelectronics Arizona class devices

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Message-ID: <20120625223058.GD30406@opensource.wolfsonmicro.com>
Date:	Mon, 25 Jun 2012 23:30:59 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com
Subject: Re: [PATCH] gpiolib: Add support for Wolfson Microelectronics
 Arizona class devices

On Tue, Jun 26, 2012 at 03:13:58AM +0800, Linus Walleij wrote:
> On Sat, Jun 23, 2012 at 8:29 PM, Mark Brown

> > +       regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
> > +                          ARIZONA_GPN_LVL, value);

> I'm guessing that regmap is caching, selectively updating volatile
> regs and marshalling the writes in the background.

It's just the standard read/modify/write operation (the same as you've
got for ab8500 IIRC).  As far as the immediate user is concerned it's
just doing the I/O, the API will work with cache or the hardware
depending on how the chip register map is configured.

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