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Date: Sat, 12 Dec 2015 03:26:57 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Arnd Bergmann <arnd@...db.de>
Cc: linux-pm@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>,
Stephen Warren <swarren@...dotorg.org>,
Thierry Reding <thierry.reding@...il.com>,
Alexandre Courbot <gnurou@...il.com>,
linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, broonie@...nel.org,
Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH] cpufreq: tegra: add regulator dependency for T124
On Tuesday, December 08, 2015 10:52:45 PM Arnd Bergmann wrote:
> This driver is the only one that calls regulator_sync_voltage(), but it
> can currently be built with CONFIG_REGULATOR disabled, producing
> this build error:
>
> drivers/cpufreq/tegra124-cpufreq.c: In function 'tegra124_cpu_switch_to_pllx':
> drivers/cpufreq/tegra124-cpufreq.c:68:2: error: implicit declaration of function 'regulator_sync_voltage' [-Werror=implicit-function-declaration]
> regulator_sync_voltage(priv->vdd_cpu_reg);
>
> My first attempt was to implement a helper for this function
> for regulator_sync_voltage, but Mark Brown explained:
>
> We don't do this for *all* regulator API functions - there's some where
> using them strongly suggests that there is actually a dependency on
> the regulator API. This does seem like it might be falling into the
> specialist category [...]
> Looking at the code I'm pretty unclear on what the authors think the
> use of _sync_voltage() is doing in the first place so it may be even
> better to just remove the call. It seems to have been included in the
> first commit so there's not changelog explaining things and there's
> no comment either. I'd *expect* it to be a noop as far as I can see.
>
> This adds the dependency to make the driver always build successfully
> or not be enabled at all. Alternatively, we could investigate if the
> driver should stop calling regulator_sync_voltage instead.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
Applied, thanks!
Rafael
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