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

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Date:	Tue, 25 Oct 2011 11:40:34 +0530
From:	Rajendra Nayak <rnayak@...com>
To:	Shawn Guo <shawn.guo@...escale.com>
CC:	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <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 Monday 24 October 2011 09:21 PM, Shawn Guo wrote:
> On Mon, Oct 24, 2011 at 04:56:31PM +0200, Grant Likely wrote:
>> On Mon, Oct 24, 2011 at 10:51:40PM +0800, Shawn Guo wrote:
>>> On Mon, Oct 24, 2011 at 03:59:50PM +0200, Grant Likely wrote:
>>>> On Mon, Oct 24, 2011 at 09:40:26PM +0800, Shawn Guo wrote:
>>>>> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
>>>>> index 8fe132d..29dcf90 100644
>>>>> --- a/drivers/regulator/core.c
>>>>> +++ b/drivers/regulator/core.c
>>>>> @@ -2673,7 +2673,8 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
>>>>>          BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
>>>>>
>>>>>          /* find device_node and attach it */
>>>>> -       rdev->dev.of_node = of_find_node_by_name(NULL, regulator_desc->name);
>>>>> +       rdev->dev.of_node = of_find_node_by_name(dev->parent->of_node,
>>>>> +                                                regulator_desc->name);
>>>>
>>>> of_find_node_by_name() doesn't work that way.  The first argument is a
>>>> starting point, but it doesn't restrict the search to children of a
>>>> node.
>>>>
>>>> for_each_child_of_node() is what you want to use when iterating over
>>>> the children which unfortunately changes the structure of this
>>>> function.
>>>>
>>> The dev->parent->of_node is meant to point to node 'pmic: mc13892@0'.
>>> And the intention here is not to iterate over the children, but to
>>> start a search from a reasonable point rather than the top root node.
>>
>> It is always better to attach the of_node at struct device
>> registration time instead of searching the tree in common code.  The
>> of_node should already be assigned by the time regulator_register() is
>> called.
>
> That's the problem we have.  There is no 'struct dev' to attach of_node
> for each regulator by the time regulator_register() is called, because
> the 'struct dev' for each regulator is created inside
> regulator_register() as wrapped by 'struct regulator_dev'.

The root of your problem seems to be that your pmic driver isn't
registering regulator devices from DT, and if it did, you wouldn't
need to do a search in dev->parent->of_node and instead the driver
would have the right dev->of_node populated.

>

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