linux-kernel - Re: [PATCH v2 2/3] regulator: Add support for S2MPA01 regulator

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Date:	Thu, 13 Feb 2014 10:54:28 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"sbkim73@...sung.com" <sbkim73@...sung.com>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>
Subject: Re: [PATCH v2 2/3] regulator: Add support for S2MPA01 regulator

On 12 February 2014 23:32, Mark Rutland <mark.rutland@....com> wrote:
> On Thu, Jan 09, 2014 at 11:22:33AM +0000, Sachin Kamat wrote:
>> Add support for S2MPA01 voltage and current regulator.
>>
>> Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
>> ---
>> * Addressed comments from Mark Brown
>>  - Used module_platform_driver instead of subsys init call
>> ---
>>  drivers/regulator/Kconfig   |    7 +
>>  drivers/regulator/Makefile  |    1 +
>>  drivers/regulator/s2mpa01.c |  482 +++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 490 insertions(+)
>>  create mode 100644 drivers/regulator/s2mpa01.c
>
> [...]
>
>> +static int s2mpa01_pmic_probe(struct platform_device *pdev)
>> +{
>> +       struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
>> +       struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
>> +       struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
>> +       struct device_node *reg_np = NULL;
>> +       struct regulator_config config = { };
>> +       struct s2mpa01_info *s2mpa01;
>> +       int i, ret;
>> +
>> +       s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
>> +       if (!s2mpa01)
>> +               return -ENOMEM;
>> +
>> +       for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
>> +               rdata[i].name = regulators[i].name;
>> +
>> +       if (iodev->dev->of_node) {
>> +               reg_np = of_find_node_by_name(iodev->dev->of_node,
>> +                                                       "regulators");
>
> This walks the allnodes list, and can thus walk outside of the parent
> node.
>
> Use of_get_child_by_name instead.

OK.

>
>> +                       if (!reg_np) {
>> +                               dev_err(&pdev->dev,
>> +                                       "could not find regulators sub-node\n");
>> +                               return -EINVAL;
>> +                       }
>> +
>> +               of_regulator_match(&pdev->dev, reg_np, rdata,
>> +                                               S2MPA01_REGULATOR_MAX);
>
> Is a reference to reg_np held beyond this? Do you need an
> of_node_put(reg_np)?

Yes, you are right.

Thanks for the review.

-- 
With warm regards,
Sachin
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