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Subject: Re: [PATCH 1/3] opp: core: add regulators enable and disable
To:     Viresh Kumar <viresh.kumar@linaro.org>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Chanwoo Choi <cw00.choi@samsung.com>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        Kukjin Kim <kgene@kernel.org>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Mark Rutland <mark.rutland@arm.com>,
        MyungJoo Ham <myungjoo.ham@samsung.com>,
        Nishanth Menon <nm@ti.com>, Rob Herring <robh+dt@kernel.org>,
        Stephen Boyd <sboyd@kernel.org>,
        Viresh Kumar <vireshk@kernel.org>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org
From:   Kamil Konieczny <k.konieczny@partner.samsung.com>
Message-ID: <3d6eacb8-ed8d-d4ac-1c36-6224ab88a5dc@partner.samsung.com>
Date:   Wed, 10 Jul 2019 12:16:48 +0200
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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.

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