linux-kernel - Re: [PATCH v2 2/6] rtc: pm8xxx: use regmap API for register accesses

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Message-ID: <20140310213524.GL18529@joshc.qualcomm.com>
Date:	Mon, 10 Mar 2014 16:35:24 -0500
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	linux-arm-msm@...r.kernel.org, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2 2/6] rtc: pm8xxx: use regmap API for register accesses

On Mon, Mar 10, 2014 at 01:47:41PM -0700, Andrew Morton wrote:
> On Mon, 10 Mar 2014 13:44:45 -0500 Josh Cartwright <joshc@...eaurora.org> wrote:
> > Now that the parent mfd driver has been made to work again, and has been
> > reworked to create a regmap instance intended for it's children to use,
> > rework the pm8xxx driver to use the regmap API for it's register
> > accesses.
> 
> Do we need a 
> 
> 	depends on REGMAP
> 
> in Kconfig?

Good question.  This driver already gets the REGMAP dependency through
it's parent (MFD_PM8XXX), which does 'select REGMAP'.

I recall there being some history as to why individual drivers shouldn't
explicitly depend on REGMAP, as it's the parent drivers/subsystem
responsibility to select it when needed, however I can't recall details.
Perhaps it's due to REGMAP not being a user-selectable option.

(FWIW, I did force a build of this driver with !REGMAP, and it builds
just fine with the regmap_write()/_read() stubs, but of course it
wouldn't do anything meaningful at runtime)

Thanks,
  Josh

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