[PATCH v2 4/7] thermal: exynos: simplify regulator (de)initialization

[Daniel Lezcano]

On 29/09/2023 13:03, Marek Szyprowski wrote:
> On 29.09.2023 12:46, Daniel Lezcano wrote:
>> On 26/09/2023 13:02, Mateusz Majewski wrote:
>>> Hi,
>>>
>>>> This is not equivalent. If regulator is provided and enable fails, the
>>>> old code is nicely returning error. Now, it will print misleading
>>>> message - failed to get regulator - and continue.
>>>>
>>>> While this simplifies the code, it ignores important running
>>>> condition -
>>>> having regulator enabled.
>>>
>>> Would doing this be correct?
>>>
>>> ret = devm_regulator_get_enable_optional(&pdev->dev, "vtmu");
>>> switch (ret) {
>>> case 0:
>>> case -ENODEV:
>>
>> Not sure to understand why -NODEV is not an error
> 
> 
> Because this what devm_regulator_get_enable_optional() returns if no
> regulator is defined. I also got confused by this a few times.

The code before this change calls devm_regulator_get_optional() which 
returns -ENODEV too, right ? But there is no special case for this error.

So this change uses devm_regulator_get_enable_optional() and handle the 
ENODEV as a non-error, so there is a change in the behavior.


>>>      break;
>>> case -EPROBE_DEFER:
>>>      return -EPROBE_DEFER;
>>> default:
>>>      dev_err(&pdev->dev, "Failed to get enabled regulator: %d\n",
>>>          ret);
>>>      return ret;
>>> }
>>
>> ret = devm_regulator_get_enable_optional(&pdev->dev, "vtmu");
>> if (ret < 0) {
>>      if (ret != EPROBE_DEFER)
>>          dev_err(&pdev->dev, "Failed to get enabled regulator: %d\n",
>> ret);
>>      return ret;
>> }
>>
>> ??
>>
> Best regards

-- 
<http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog