linux-kernel - Re: [RFC PATCH v2 01/17] OPP: Allow to request stub voltage regulators

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Date:   Mon, 22 Oct 2018 11:06:36 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 01/17] OPP: Allow to request stub voltage
 regulators

On 21-10-18, 23:54, Dmitry Osipenko wrote:
> Voltage regulators may be not available on some variations of HW, allow to
> request stub voltage regulators by OPP core in a such case to reduce code
> churning within drivers.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/cpufreq/cpufreq-dt.c | 2 +-
>  drivers/cpufreq/ti-cpufreq.c | 3 ++-
>  drivers/opp/core.c           | 9 +++++++--
>  include/linux/pm_opp.h       | 4 ++--
>  4 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
> index e58bfcb1169e..6ebca472ec76 100644
> --- a/drivers/cpufreq/cpufreq-dt.c
> +++ b/drivers/cpufreq/cpufreq-dt.c
> @@ -196,7 +196,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
>  	 */
>  	name = find_supply_name(cpu_dev);
>  	if (name) {
> -		opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1);
> +		opp_table = dev_pm_opp_set_regulators(cpu_dev, &name, 1, false);
>  		if (IS_ERR(opp_table)) {
>  			ret = PTR_ERR(opp_table);
>  			dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",

Have you actually tested this stuff ? The cpufreq-dt driver will
probably fail to probe if the CPU node has a "-supply" property, but
no regulator matching that.

-- 
viresh