linux-kernel - Re: [PATCH 3/4] PM / OPP: opp-microvolt is not optional if regulators are set

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Date:   Mon, 22 May 2017 18:20:53 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 3/4] PM / OPP: opp-microvolt is not optional if
 regulators are set

On 05/17, Viresh Kumar wrote:
> If dev_pm_opp_set_regulators() is called for a device and its regulators
> are set in the OPP core, the OPP nodes for the device must contain the
> "opp-microvolt" property, otherwise there is something wrong and we
> better error out.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/base/power/opp/of.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c
> index 779428676f63..c6fc8cbad10d 100644
> --- a/drivers/base/power/opp/of.c
> +++ b/drivers/base/power/opp/of.c
> @@ -131,8 +131,15 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
>  		prop = of_find_property(opp->np, name, NULL);
>  
>  		/* Missing property isn't a problem, but an invalid entry is */
> -		if (!prop)
> -			return 0;
> +		if (!prop) {
> +			/* The regulator-count must be zero here */

Comment is restating code with no insight into what's so special,
how about:

			/*
			 * But it better not be missing if we're
			 * expecting OPP core to manage regulators
			 */

Although I suppose the dev_err message is pretty good.

> +			if (!opp_table->regulator_count)
> +				return 0;
> +
> +			dev_err(dev, "%s: opp-microvolt missing even if regulators are available\n",

"missing although OPP managing regulators"?

> +				__func__);

-- 
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