linux-kernel - Re: [PATCH v2 2/7] MFD: twl6040: Convert to i2c driver, and separate it from twl core

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Date:	Tue, 7 Feb 2012 13:43:44 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Liam Girdwood <lrg@...com>, Dmitry Torokhov <dtor@...l.ru>,
	Misael Lopez Cruz <misael.lopez@...com>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/7] MFD: twl6040: Convert to i2c driver, and separate
 it from twl core

On Tue, Feb 07, 2012 at 03:39:24PM +0200, Peter Ujfalusi wrote:

> In the codec driver I have one 'shadow' register which does not exist on
> the HW. I'm going to need to have access to that shadow register's bits
> in the future transparently.

Alternatively just rewrite the code for that to use a variable in the
driver private data.

> I was wondering if we could add support to regmap for such SW only
> registers. This would only make sens if the cache is enabled. We could
> have a callback let's say shadow_reg() in remap_config struct. If it is
> a shadow reg we never reach out for the HW and operate only on the cache.
> Is this something we can add to regmap?

That just sounds far too icky - I'm really not happy that people have
been doing that in ASoC TBH, it just makes everything more tricky than
it should be.  It save a little bit of effort with the control but just
pushes that complexity elsewhere where you're not expecting it.

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