linux-kernel - Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible string for device binding

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Message-ID: <20141020061024.GA9406@jack-ThinkPad-T520>
Date:	Mon, 20 Oct 2014 15:10:24 +0900
From:	Gyungoh Yoo <gyungoh@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	sameo@...ux.intel.com, lee.jones@...aro.org, jg1.han@...sung.com,
	cooloney@...il.com, lgirdwood@...il.com, jack.yoo@...worksinc.com,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	grant.likely@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	pawel.moll@....com, heiko@...ech.de, jason@...edaemon.net,
	shawn.guo@...escale.com, treding@...dia.com,
	florian.vaussard@...l.ch, trivial@...nel.org, linux@...ck-us.net,
	andrew@...n.ch, jic23@...nel.org
Subject: Re: [RESUBMIT PATCH v4 7/8] regulator: sky81452: Add compatible
 string for device binding

On Fri, Oct 17, 2014 at 04:26:05PM +0200, Mark Brown wrote:
> On Fri, Oct 17, 2014 at 07:43:09PM +0900, Gyungoh Yoo wrote:
> 
> > Are you talking about simplification using of_regulator_match()?
> > This driver has only one regulator.
> > Is the API also useful for this driver?
> 
> The thing I'm seeing is that the binding for your device with the
> subnode looks very much like the device trees of devices with multiple
> regulators.  The fact that you only have one regulator is a bit
> difference but not that much.  It seems like drivers should fit into one
> of two patterns: either the regulator is described in the root node for
> the device for single purpose devices or there should be a collection of
> regulators like is supported with this helper API.  Having a collection
> with only one node doesn't seem to be a problem in any way.
> 
> > Like reg-fixed-voltage, how about using of_get_fixed_voltage_config()?
> 
> The driver doesn't seem to need any property parsing of its own so it
> shoudn't need anything beyond basic calls into the core.

Thank you for your kind comments.
My understanding is getting better.

For my clear understanding:
I think the original designed which I wanted to design is similar
with arizona-ldo1.c
It seems that this is 1st pattern your explained above.
Can I ask what is different between arizona-ldo1.c and
this sky81452-regulator.c?
I think both are designed under root node.

Thank you.

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