linux-kernel - Re: [PATCH v2 1/2] regulator: act8945a: add regulator driver for ACT8945A

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Message-ID: <878u3kvgsc.fsf@dell.be.48ers.dk>
Date:	Wed, 20 Jan 2016 08:41:55 +0100
From:	Peter Korsgaard <peter@...sgaard.com>
To:	"Yang\, Wenyou" <Wenyou.Yang@...el.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	"Rob Herring" <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	"devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>,
	"Ferre\, Nicolas" <Nicolas.FERRE@...el.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Javier Martinez Canillas <javier@...hile0.org>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/2] regulator: act8945a: add regulator driver for ACT8945A

>>>>> "Yang," == Yang, Wenyou <Wenyou.Yang@...el.com> writes:

Hi,

>> > The MFD sub device is registered as a platform device, the existing  > act8865
 >> driver is registered as an i2c_driver. How do they match? :)
 >> 
 >> > Could you point out which exiting driver for me to reference.  Thank you!
 >> 
 >> What I'm saying is that it isn't nice that we end up with both act8865-regulator.c
 >> and act8954-regulator.c doing 95% the same. This can either be fixed by:
 >> 
 >> - Adding act8865 support to your mfd driver (but only registering the
 >> regulator subdev for act8865) and changing the existing
 >> act8865-regulator driver to work as a mfd subdev (platform device)
 >> 
 >> - Extending the act8865-regulator driver to register as a platform
 >> driver in ADDITION to a i2c driver so it can be used with mfd. The
 >> driver already uses regmap so it should only be a matter of adding the
 >> pdev probe/remove functions.

 > After think twice, I think this will complicates the act8865-regulator driver.

I don't think it will add a lot of complication (E.G. basically just the
platform probe/remove functions), but Ok - I'll wait and see your
simplified driver.

-- 
Venlig hilsen,
Peter Korsgaard