linux-kernel - Re: [PATCH v2 3/5] regulator: helper routine to extract regulator_init

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Date:	Tue, 25 Oct 2011 12:43:55 +0530
From:	Rajendra Nayak <rnayak@...com>
To:	Shawn Guo <shawn.guo@...escale.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	broonie@...nsource.wolfsonmicro.com, patches@...aro.org,
	tony@...mide.com, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	lrg@...com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] regulator: helper routine to extract regulator_init_data

On Tuesday 25 October 2011 12:50 PM, Shawn Guo wrote:
> On Tue, Oct 25, 2011 at 12:26:01PM +0530, Rajendra Nayak wrote:
>> On Tuesday 25 October 2011 12:22 PM, Shawn Guo wrote:
>>> On Tue, Oct 25, 2011 at 11:30:19AM +0530, Rajendra Nayak wrote:
> [...]
>>>> Thats what we did for OMAP, and hence we always have the of_node
>>>> populated when the regulator devices are probed.
>>>> See this patch from Benoit on how thats done for twl devices..
>>>> http://marc.info/?l=linux-omap&m=131489864814428&w=2
>>>>
>>> OMAP is "Case 1", and we are talking about "Case 2".
>>
>> I don't see why it wouldn't work for "Case 2".
>
> I did not say it wouldn't work for "Case 2".  I meant they work in
> different way.
>
>> The only difference
>> is in case of "Case 1", the dev->of_node would already point to
>> the right regulator node, like 'reg1', 'reg2' above.
>> In case of "Case 2", the dev->of_node would point to the 'regulators'
>> node instead, and the driver could then do a for_each_child_of_node()
>> to iterate over all its children to get 'reg1', 'reg2' etc.
>>
> Yes, that's the difference.  So you will need to distinguish these
> two cases in regulator_register()?  How?

You don't need to distinguish these cases in regulator_register().
The driver knows if its handling "Case 1" devices or "Case 2" devices
and it needs to handle things accordingly and pass the right of_node
which regulator_register() can then attach to regulator_dev->dev.

>

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