linux-kernel - Re: [PATCH v2.2 2/2] dt-bindings: Adding compatible attribute for SKY81452 regulator

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Message-ID: <20140919061704.GA3316@jack-ThinkPad-T520>
Date:	Fri, 19 Sep 2014 15:17:04 +0900
From:	Gyungoh Yoo <gyungoh@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	lgirdwood@...il.com, grant.likely@...aro.org, robh+dt@...nel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Gyungoh Yoo <jack.yoo@...worksinc.com>
Subject: Re: [PATCH v2.2 2/2] dt-bindings: Adding compatible attribute for
 SKY81452 regulator

On Mon, Sep 15, 2014 at 03:35:54PM -0700, Mark Brown wrote:
> On Thu, Sep 11, 2014 at 02:22:30PM +0900, Gyungoh Yoo wrote:
> 
> > By the way,
> > I knew that compatible string is used for binding a driver.
> > http://devicetree.org/Device_Tree_Usage#Understanding_the_compatible_Property
> 
> > And, from kernel 3.6, MFD core has a mechanism for binding of_node
> > to the driver with of_compatible.
> 
> > Can I have a question about if it is possible to assign compatible string
> > for binding driver independently with reusability?
> 
> Look at a driver like the wm831x regulator drivers - they don't have
> device tree but they're reusing a driver for an IP with the base
> register for the IP being specified in the MFD.  If convering to DT it
> might be reasonable to specify this in device tree, though it's marginal
> since the part name in the core is also good enough.

Thank you for your comment.

I agree.
A child driver can look DT up and reference the base information
in MFD with or without compatible string.
My idea was about easy-binding of DT without referencing
parent node because the recent kernel support this infrastructure.
I will add more information in DT to reuse the driver for the IP,
and I will resubmit.
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