linux-kernel - Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

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Message-ID: <20130715064949.GA11486@S2101-09.ap.freescale.net>
Date:	Mon, 15 Jul 2013 14:49:51 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Robin Gong <b38343@...escale.com>
CC:	<linux-kernel@...r.kernel.org>, <grant.likely@...aro.org>,
	<rob.herring@...xeda.com>, <lgirdwood@...il.com>,
	<broonie@...nel.org>, <devicetree-discuss@...ts.ozlabs.org>,
	<linux-doc@...r.kernel.org>, <rob@...dley.net>
Subject: Re: [PATCH v2] regulator: pfuze100: add pfuze100 regulator driver

On Mon, Jul 15, 2013 at 02:40:39PM +0800, Robin Gong wrote:
> > > +static const struct of_device_id pfuze_dt_ids[] = {
> > > +	{ .compatible = "fsl,pfuze100", .data = (void *)PFUZE_ID_PFUZE100},
> > 
> > You do not use .data in the driver at all, and can just drop it.
> >
> good catch. .driver_data  of i2c_device_id and .data of of_device_id are two different ways to let driver know which chip used now by DTS or not. I should use them to know which chip used now ,although I can know by reading chipid register. 
> 

If you can figure out the chip ID from hardware, it should be used as
the preference over compatible and .driver_data.

Shawn

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