linux-kernel - [PATCH v2 1/4] cpufreq: tegra: Call tegra_cpufreq

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Date:	Thu, 12 Sep 2013 04:24:48 -0700
From:	Bill Huang <bilhuang@...dia.com>
To:	<rjw@...k.pl>, <viresh.kumar@...aro.org>, <swarren@...dotorg.org>
CC:	<linux@....linux.org.uk>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<cpufreq@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	Bill Huang <bilhuang@...dia.com>
Subject: [PATCH v2 1/4] cpufreq: tegra: Call tegra_cpufreq_init() specifically in machine code

Move the call from module_init to Tegra machine codes so it won't be
called in a multi-platform kernel running on non-Tegra SoCs.

Signed-off-by: Bill Huang <bilhuang@...dia.com>
---
 arch/arm/mach-tegra/common.c    |    2 ++
 drivers/cpufreq/tegra-cpufreq.c |   13 ++-----------
 include/linux/tegra-soc.h       |   11 ++++++++++-
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 94a119a..db4414e 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -25,6 +25,7 @@
 #include <linux/reboot.h>
 #include <linux/irqchip.h>
 #include <linux/clk-provider.h>
+#include <linux/tegra-soc.h>
 
 #include <asm/hardware/cache-l2x0.h>
 
@@ -109,6 +110,7 @@ void __init tegra_init_early(void)
 
 void __init tegra_init_late(void)
 {
+	tegra_cpufreq_init();
 	tegra_init_suspend();
 	tegra_cpuidle_init();
 	tegra_powergate_debugfs_init();
diff --git a/drivers/cpufreq/tegra-cpufreq.c b/drivers/cpufreq/tegra-cpufreq.c
index a7b876f..09c5af0 100644
--- a/drivers/cpufreq/tegra-cpufreq.c
+++ b/drivers/cpufreq/tegra-cpufreq.c
@@ -253,7 +253,7 @@ static struct cpufreq_driver tegra_cpufreq_driver = {
 	.attr		= tegra_cpufreq_attr,
 };
 
-static int __init tegra_cpufreq_init(void)
+int __init tegra_cpufreq_init(void)
 {
 	cpu_clk = clk_get_sys(NULL, "cclk");
 	if (IS_ERR(cpu_clk))
@@ -275,17 +275,8 @@ static int __init tegra_cpufreq_init(void)
 
 	return cpufreq_register_driver(&tegra_cpufreq_driver);
 }
-
-static void __exit tegra_cpufreq_exit(void)
-{
-        cpufreq_unregister_driver(&tegra_cpufreq_driver);
-	clk_put(emc_clk);
-	clk_put(cpu_clk);
-}
-
+EXPORT_SYMBOL(tegra_cpufreq_init);
 
 MODULE_AUTHOR("Colin Cross <ccross@...roid.com>");
 MODULE_DESCRIPTION("cpufreq driver for Nvidia Tegra2");
 MODULE_LICENSE("GPL");
-module_init(tegra_cpufreq_init);
-module_exit(tegra_cpufreq_exit);
diff --git a/include/linux/tegra-soc.h b/include/linux/tegra-soc.h
index 95f611d..d86d081 100644
--- a/include/linux/tegra-soc.h
+++ b/include/linux/tegra-soc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2012,2013, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -19,4 +19,13 @@
 
 u32 tegra_read_chipid(void);
 
+#ifdef CONFIG_ARM_TEGRA_CPUFREQ
+int tegra_cpufreq_init(void);
+#else
+static inline int tegra_cpufreq_init(void)
+{
+	return -EINVAL;
+}
+#endif
+
 #endif /* __LINUX_TEGRA_SOC_H_ */
-- 
1.7.9.5

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