Re: [PATCH 1/3] opp: core: add regulators enable and disable

[Kamil Konieczny]

On 09.07.2019 07:40, Viresh Kumar wrote:
> On 08-07-19, 16:11, k.konieczny@xxxxxxxxxxxxxxxxxxx wrote:
>> From: Kamil Konieczny <k.konieczny@xxxxxxxxxxxxxxxxxxx>
>>
>> Add enable regulators to dev_pm_opp_set_regulators() and disable
>> regulators to dev_pm_opp_put_regulators(). This prepares for
>> converting exynos-bus devfreq driver to use dev_pm_opp_set_rate().
>>
>> Signed-off-by: Kamil Konieczny <k.konieczny@xxxxxxxxxxxxxxxxxxx>
>> ---
>>  drivers/opp/core.c | 13 +++++++++++++
>>  1 file changed, 13 insertions(+)
>>
>> diff --git a/drivers/opp/core.c b/drivers/opp/core.c
>> index 0e7703fe733f..947cac452854 100644
>> --- a/drivers/opp/core.c
>> +++ b/drivers/opp/core.c
>> @@ -1580,8 +1580,19 @@ struct opp_table *dev_pm_opp_set_regulators(struct device *dev,
>>  	if (ret)
>>  		goto free_regulators;
>>  
>> +	for (i = 0; i < opp_table->regulator_count; i++) {
>> +		ret = regulator_enable(opp_table->regulators[i]);
>> +		if (ret < 0)
>> +			goto disable;
>> +	}
> 
> I am wondering on why is this really required as this isn't done for
> any other platform, probably because the regulators are enabled by
> bootloader and are always on.

It was not enabled for historical reasons, from design point regualtors
should be enabled before use.

-- 
Best regards,
Kamil Konieczny
Samsung R&D Institute Poland