lkml.org 
[lkml]   [2019]   [Jul]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/3] opp: core: add regulators enable and disable
From
Date


On 10.07.2019 12:16, Kamil Konieczny wrote:
>
>
> On 09.07.2019 07:40, Viresh Kumar wrote:
>> On 08-07-19, 16:11, k.konieczny@partner.samsung.com wrote:
>>> From: Kamil Konieczny <k.konieczny@partner.samsung.com>
>>>
>>> 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@partner.samsung.com>
>>> ---
>>> 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.

On Exynos platform devfreq driver (exynos-bus) always enabled them,
so I wanted to preserve the current behaviour.

I've also checked the change with cpufreq-dt driver and it doesn't cause
issues.

Do you find this change acceptable?


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

\
 
 \ /
  Last update: 2019-07-10 12:42    [W:0.054 / U:16.004 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site