[CPUFREQ] allow use of the powersave governor as the default one

Allow use of the powersave cpufreq governor as the default one for EMBEDDED
configs.

Signed-off-by: Alessandro Guido <alessandro.guido@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/cpufreq/Kconfig

@@ -69,6 +69,15 @@ config CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 	  the frequency statically to the highest frequency supported by
 	  the CPU.
 
+config CPU_FREQ_DEFAULT_GOV_POWERSAVE
+	bool "powersave"
+	depends on EMBEDDED
+	select CPU_FREQ_GOV_POWERSAVE
+	help
+	  Use the CPUFreq governor 'powersave' as default. This sets
+	  the frequency statically to the lowest frequency supported by
+	  the CPU.
+
 config CPU_FREQ_DEFAULT_GOV_USERSPACE
 	bool "userspace"
 	select CPU_FREQ_GOV_USERSPACE

drivers/cpufreq/cpufreq_powersave.c

@@ -35,12 +35,12 @@ static int cpufreq_governor_powersave(struct cpufreq_policy *policy,
 	return 0;
 }
 
-static struct cpufreq_governor cpufreq_gov_powersave = {
+struct cpufreq_governor cpufreq_gov_powersave = {
 	.name		= "powersave",
 	.governor	= cpufreq_governor_powersave,
 	.owner		= THIS_MODULE,
 };
-
+EXPORT_SYMBOL(cpufreq_gov_powersave);
 
 static int __init cpufreq_gov_powersave_init(void)
 {
@@ -58,5 +58,9 @@ MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>");
 MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'");
 MODULE_LICENSE("GPL");
 
+#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE
+fs_initcall(cpufreq_gov_powersave_init);
+#else
 module_init(cpufreq_gov_powersave_init);
+#endif
 module_exit(cpufreq_gov_powersave_exit);

include/linux/cpufreq.h

@@ -308,6 +308,9 @@ extern struct cpufreq_governor cpufreq_gov_performance;
 #endif
 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE
 #define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_performance)
+#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE)
+extern struct cpufreq_governor cpufreq_gov_powersave;
+#define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_powersave)
 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
 extern struct cpufreq_governor cpufreq_gov_userspace;
 #define CPUFREQ_DEFAULT_GOVERNOR	(&cpufreq_gov_userspace)