linux-kernel - Re: [PATCH 3/4] mfd: tps65910: Add device-tree support

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Message-ID: <20120419125041.GH3046@opensource.wolfsonmicro.com>
Date:	Thu, 19 Apr 2012 13:50:41 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Rhyland Klein <rklein@...dia.com>
Cc:	Liam Girdwood <lrg@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 3/4] mfd: tps65910: Add device-tree support

On Wed, Apr 18, 2012 at 12:35:58PM -0700, Rhyland Klein wrote:
> On Wed, 2012-04-18 at 02:01 -0700, Mark Brown wrote:

> > This is a really odd idiom - normally the pattern for device tree
> > support is to just go and try to use the device tree data if it's there
> > and there's no need for any flag to say if it should be used.

> I agree its odd. My concern was that the idiom is that is pdata assigned
> from board files should override dt data. At this point, we don't know
> where the tps65910->board_data is coming from, dt or board files.
> Arbitrarily using dt breaks that idiom. We could do a check like this if
> you prefer:

No, just prefer the DT - what you're proposing is exactly the opposite
idiom to what all the other DT drivers do so we'd need to go round
changing the policy globally at which point we probably want to start
having helpers for this.

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