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From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: "Rafael J. Wysocki" <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>,
	Viresh Kumar
	<viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Alexandre Courbot
	<gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	Liam Girdwood <lgirdwood-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: [PATCH] cpufreq: tegra: add regulator dependency for T124
Date: Tue, 08 Dec 2015 22:52:45 +0100	[thread overview]
Message-ID: <2194927.eV2s2QmZs0@wuerfel> (raw)

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-r2nGTMty4D4@public.gmane.org>

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 235a1ba73d92..b1f8a73e5a94 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -226,7 +226,7 @@ config ARM_TEGRA20_CPUFREQ
 
 config ARM_TEGRA124_CPUFREQ
 	tristate "Tegra124 CPUFreq support"
-	depends on ARCH_TEGRA && CPUFREQ_DT
+	depends on ARCH_TEGRA && CPUFREQ_DT && REGULATOR
 	default y
 	help
 	  This adds the CPUFreq driver support for Tegra124 SOCs.

WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de>
To: linux-pm@vger.kernel.org
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Stephen Warren <swarren@wwwdotorg.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	Alexandre Courbot <gnurou@gmail.com>,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, broonie@kernel.org,
	Liam Girdwood <lgirdwood@gmail.com>
Subject: [PATCH] cpufreq: tegra: add regulator dependency for T124
Date: Tue, 08 Dec 2015 22:52:45 +0100	[thread overview]
Message-ID: <2194927.eV2s2QmZs0@wuerfel> (raw)

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@arndb.de>

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 235a1ba73d92..b1f8a73e5a94 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -226,7 +226,7 @@ config ARM_TEGRA20_CPUFREQ
 
 config ARM_TEGRA124_CPUFREQ
 	tristate "Tegra124 CPUFreq support"
-	depends on ARCH_TEGRA && CPUFREQ_DT
+	depends on ARCH_TEGRA && CPUFREQ_DT && REGULATOR
 	default y
 	help
 	  This adds the CPUFreq driver support for Tegra124 SOCs.


WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] cpufreq: tegra: add regulator dependency for T124
Date: Tue, 08 Dec 2015 22:52:45 +0100	[thread overview]
Message-ID: <2194927.eV2s2QmZs0@wuerfel> (raw)

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@arndb.de>

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 235a1ba73d92..b1f8a73e5a94 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -226,7 +226,7 @@ config ARM_TEGRA20_CPUFREQ
 
 config ARM_TEGRA124_CPUFREQ
 	tristate "Tegra124 CPUFreq support"
-	depends on ARCH_TEGRA && CPUFREQ_DT
+	depends on ARCH_TEGRA && CPUFREQ_DT && REGULATOR
 	default y
 	help
 	  This adds the CPUFreq driver support for Tegra124 SOCs.

             reply	other threads:[~2015-12-08 21:52 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-08 21:52 Arnd Bergmann [this message]
2015-12-08 21:52 ` [PATCH] cpufreq: tegra: add regulator dependency for T124 Arnd Bergmann
2015-12-08 21:52 ` Arnd Bergmann
2015-12-09  2:16 ` Viresh Kumar
2015-12-09  2:16   ` Viresh Kumar
2015-12-09 12:03 ` Jon Hunter
2015-12-09 12:03   ` Jon Hunter
2015-12-09 12:03   ` Jon Hunter
     [not found]   ` <5668188F.2080202-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2015-12-09 14:47     ` Mark Brown
2015-12-09 14:47       ` Mark Brown
2015-12-09 14:47       ` Mark Brown
2015-12-09 17:33       ` Jon Hunter
2015-12-09 17:33         ` Jon Hunter
2015-12-09 17:33         ` Jon Hunter
2015-12-09 20:10         ` Mark Brown
2015-12-09 20:10           ` Mark Brown
2015-12-10 10:07           ` Jon Hunter
2015-12-10 10:07             ` Jon Hunter
2015-12-10 10:07             ` Jon Hunter
2015-12-10 10:07             ` Jon Hunter
     [not found]             ` <56694EFA.7010901-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2015-12-10 11:35               ` Mark Brown
2015-12-10 11:35                 ` Mark Brown
2015-12-10 11:35                 ` Mark Brown
2015-12-10 12:12                 ` Jon Hunter
2015-12-10 12:12                   ` Jon Hunter
2015-12-10 12:12                   ` Jon Hunter
2015-12-12  2:26 ` Rafael J. Wysocki
2015-12-12  2:26   ` Rafael J. Wysocki
2015-12-12  2:26   ` Rafael J. Wysocki

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