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

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Date:	Wed, 22 Aug 2012 23:21:03 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Dong Aisheng <b29396@...escale.com>
CC:	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, richard.zhao@...escale.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 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.)
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