linux-kernel - Re: [PATCH v2 1/5] Samsung SoC ADC: use regulator (VDD for ADC).

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Date:	Wed, 22 Jun 2011 11:40:46 +0900
From:	MyungJoo Ham <myungjoo.ham@...sung.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Ben Dooks <ben-linux@...ff.org>,
	Kyungmin Park <kyungmin.park@...sung.com>, dg77.kim@...sung.com
Subject: Re: [PATCH v2 1/5] Samsung SoC ADC: use regulator (VDD for ADC).

On Tue, Jun 21, 2011 at 7:43 PM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> On Tue, Jun 21, 2011 at 10:58:43AM +0900, MyungJoo Ham wrote:
>
>> +     ret = regulator_enable(adc->vdd);
>> +     if (!ret)
>> +             goto err_ioremap;
>> +
>
> This test looks the wrong way round?  regulator_enable() should return 0
> on success but this will treat that as an error.

Whoops.. thanks for pointing that out!

>
>>  static int s3c_adc_resume(struct platform_device *pdev)
>>  {
>>       struct adc_device *adc = platform_get_drvdata(pdev);
>> +     int ret;
>>
>> +     ret = regulator_enable(adc->vdd);
>>       clk_enable(adc->clk);
>>       enable_irq(adc->irq);
>>
>>       writel(adc->prescale | S3C2410_ADCCON_PRSCEN,
>>              adc->regs + S3C2410_ADCCON);
>>
>> -     return 0;
>> +     return ret;
>
> Seems better to return as soon as we notice the error, no point in
> starting anything else up if we don't have power.
>

Ok. I see.



-- 
MyungJoo Ham (함명주), Ph.D.
Mobile Software Platform Lab,
Digital Media and Communications (DMC) Business
Samsung Electronics
cell: 82-10-6714-2858
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