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

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Date:   Tue, 9 Jul 2019 11:10:14 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     k.konieczny@...tner.samsung.com
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mark Rutland <mark.rutland@....com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 1/3] opp: core: add regulators enable and disable

On 08-07-19, 16:11, k.konieczny@...tner.samsung.com wrote:
> From: Kamil Konieczny <k.konieczny@...tner.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@...tner.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.

-- 
viresh