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 11:56:58 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Richard Zhao <richard.zhao@...escale.com>
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 08/23/2012 12:12 AM, Richard Zhao wrote:
> 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
> phandle. The node is got by find compatible or by path.

That sounds a little odd; why not just use a phandle consistently
everywhere?

Either way though, I could imagine still putting all the lookup code
into the syscon driver; just have different functions for the different
lookup methods:

imx_syscon_lookup_by_phandle(np, char *property_name)
imx_syscon_lookup_by_compatible(char *compatible
imx_syscon_lookup_by_path(char *node_path)
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