linux-kernel - Re: [PATCH v2 3/5] regulator: helper routine to extract regulator_init

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Message-ID: <20111024090228.GA1755@S2100-06.ap.freescale.net>
Date:	Mon, 24 Oct 2011 17:02:29 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	Rajendra Nayak <rnayak@...com>,
	<broonie@...nsource.wolfsonmicro.com>, <patches@...aro.org>,
	<tony@...mide.com>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<lrg@...com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/5] regulator: helper routine to extract
 regulator_init_data

On Mon, Oct 24, 2011 at 10:17:06AM +0200, Grant Likely wrote:
> On Mon, Oct 24, 2011 at 11:32:19AM +0530, Rajendra Nayak wrote:
> > On Friday 21 October 2011 05:28 PM, Shawn Guo wrote:
> > >On Fri, Oct 21, 2011 at 02:11:55PM +0530, Rajendra Nayak wrote:
> > >[...]
> > >>>+       /* find device_node and attach it */
> > >>>+       rdev->dev.of_node = of_find_node_by_name(NULL, regulator_desc->name);
> > >>
> > >>so would this do a complete dt search for every regulator?
> > >
> > >Yes, with the first param being NULL, tthe entire device tree will be
> > >searched.
> > >
> > >>we would also need the driver names and dt names to match for this to
> > >>work, right?
> > >>
> > >Driver name does not matter.  The key for this search to work is having
> > >regulator's name (regulator_desc->name) match device tree node's name,
> > >case ignored.
> > 
> > Mark, whats your take on this? I am somehow not quite sure if we should
> > have this limitation put in to match DT node names with whats in the
> > driver structs (regulator_desc).
> 
> This looks wrong to me.  Matching based on node /name/, particularly
> when searching the entire tree, will cause problems.
> 
Okay, it's wrong then since so many people say it's wrong :)  I guess
a quick fix would be adding one property in device tree node for
matching some unique field in regulator_desc, id, maybe?  Mark, any
suggestion?

-- 
Regards,
Shawn

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