linux-kernel - Re: [PATCH 4/7] regulator: anatop-regulator: convert to use imx-syscon to access anatop register

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Date:	Thu, 23 Aug 2012 14:12:03 +0800
From:	Richard Zhao <richard.zhao@...escale.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Dong Aisheng <b29396@...escale.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linus.walleij@...ricsson.com>, <s.hauer@...gutronix.de>,
	<shawn.guo@...aro.org>, <kernel@...gutronix.de>,
	<grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
	<sameo@...ux.intel.com>, <lrg@...com>,
	<broonie@...nsource.wolfsonmicro.com>,
	<devicetree-discuss@...ts.ozlabs.org>, <paul.liu@...aro.org>
Subject: Re: [PATCH 4/7] regulator: anatop-regulator: convert to use
 imx-syscon to access anatop register

On Wed, Aug 22, 2012 at 11:21:03PM -0600, Stephen Warren wrote:
> On 08/22/2012 01:18 AM, Dong Aisheng wrote:
> > Signed-off-by: Dong Aisheng <dong.aisheng@...aro.org>
> 
> > diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
> 
> > @@ -109,7 +110,11 @@ static int __devinit anatop_regulator_probe(struct platform_device *pdev)
> >  	rdesc->ops = &anatop_rops;
> >  	rdesc->type = REGULATOR_VOLTAGE;
> >  	rdesc->owner = THIS_MODULE;
> > -	sreg->mfd = anatopmfd;
> > +
> > +	sreg->anatop = of_parse_phandle(np, "fsl,anatop", 0);
> > +	if (!sreg->anatop)
> > +		return -ENODEV;
> 
> In fact, that imx_syscon_lookup function I proposed could even do the
> of_parse_phandle() internally, so perhaps:
> 
> foo->syscon_dev = imx_syscon_lookup(np, "fsl,anatop", 0);
> if (IS_ERR(foo->syscon_dev))
>     return PTR_ERR(foo->syscon_dev);
> 
> with imx_syscon_lookup() internally knowing when to return EPROBE_DEFER
> rather than any other permanent error code (e.g. for missing property,
> bad phandle, etc.)
In some case that we access register in machine code, we don't have any
phandler. The node is got by find compatible or by path.

Thanks
Richard 

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