cpufreq: fix EXYNOS drivers selection

* remove superfluous pr_debug() call from exynos_cpufreq_init()
  (init errors are always logged anyway)
* add dummy per-SoC type init functions to exynos-cpufreq.h
* make per-SoC type cpufreq config options selectable
* make CONFIG_ARM_EXYNOS_CPUFREQ config option invisible to user and
  automatically enable it when needed

This patch fixes following issues:
* EXYNOS per-SoC type cpufreq support (i.e. exynos4210-cpufreq.c) being
  always built if given SoC support was enabled (i.e. CPU_EXYNOS4210),
  even if common EXYNOS cpufreq support was disabled
* inability to select cpufreq for each SoC type separately (it could
  be only enabled/disabled for all SoCs for which support was enabled)
* EXYNOS5440 cpufreq support was always enabled when EXYNOS5440
  support was enabled and couldn't be disabled
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/Kconfig.arm

@@ -17,37 +17,47 @@ config ARM_DT_BL_CPUFREQ
 	  big.LITTLE platform. This gets frequency tables from DT.
 
 config ARM_EXYNOS_CPUFREQ
-	bool "SAMSUNG EXYNOS SoCs"
-	depends on ARCH_EXYNOS
+	bool
 	select CPU_FREQ_TABLE
-	default y
-	help
-	  This adds the CPUFreq driver common part for Samsung
-	  EXYNOS SoCs.
-
-	  If in doubt, say N.
 
 config ARM_EXYNOS4210_CPUFREQ
-	def_bool CPU_EXYNOS4210
+	bool "SAMSUNG EXYNOS4210"
+	depends on CPU_EXYNOS4210
+	default y
+	select ARM_EXYNOS_CPUFREQ
 	help
 	  This adds the CPUFreq driver for Samsung EXYNOS4210
 	  SoC (S5PV310 or S5PC210).
 
+	  If in doubt, say N.
+
 config ARM_EXYNOS4X12_CPUFREQ
-	def_bool (SOC_EXYNOS4212 || SOC_EXYNOS4412)
+	bool "SAMSUNG EXYNOS4x12"
+	depends on (SOC_EXYNOS4212 || SOC_EXYNOS4412)
+	default y
+	select ARM_EXYNOS_CPUFREQ
 	help
 	  This adds the CPUFreq driver for Samsung EXYNOS4X12
 	  SoC (EXYNOS4212 or EXYNOS4412).
 
+	  If in doubt, say N.
+
 config ARM_EXYNOS5250_CPUFREQ
-	def_bool SOC_EXYNOS5250
+	bool "SAMSUNG EXYNOS5250"
+	depends on SOC_EXYNOS5250
+	default y
+	select ARM_EXYNOS_CPUFREQ
 	help
 	  This adds the CPUFreq driver for Samsung EXYNOS5250
 	  SoC.
 
+	  If in doubt, say N.
+
 config ARM_EXYNOS5440_CPUFREQ
-	def_bool SOC_EXYNOS5440
+	bool "SAMSUNG EXYNOS5440"
+	depends on SOC_EXYNOS5440
 	depends on HAVE_CLK && PM_OPP && OF
+	default y
 	select CPU_FREQ_TABLE
 	help
 	  This adds the CPUFreq driver for Samsung EXYNOS5440
@@ -55,6 +65,8 @@ config ARM_EXYNOS5440_CPUFREQ
 	  different than previous exynos controllers so not using
 	  the common exynos framework.
 
+	  If in doubt, say N.
+
 config ARM_HIGHBANK_CPUFREQ
 	tristate "Calxeda Highbank-based"
 	depends on ARCH_HIGHBANK

drivers/cpufreq/exynos-cpufreq.c

@@ -332,7 +332,6 @@ static int __init exynos_cpufreq_init(void)
 	regulator_put(arm_regulator);
 err_vdd_arm:
 	kfree(exynos_info);
-	pr_debug("%s: failed initialization\n", __func__);
 	return -EINVAL;
 }
 late_initcall(exynos_cpufreq_init);

drivers/cpufreq/exynos-cpufreq.h

@@ -43,6 +43,27 @@ struct exynos_dvfs_info {
 	bool (*need_apll_change)(unsigned int, unsigned int);
 };
 
+#ifdef CONFIG_ARM_EXYNOS4210_CPUFREQ
 extern int exynos4210_cpufreq_init(struct exynos_dvfs_info *);
+#else
+static inline int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+#ifdef CONFIG_ARM_EXYNOS4X12_CPUFREQ
 extern int exynos4x12_cpufreq_init(struct exynos_dvfs_info *);
+#else
+static inline int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+#ifdef CONFIG_ARM_EXYNOS5250_CPUFREQ
 extern int exynos5250_cpufreq_init(struct exynos_dvfs_info *);
+#else
+static inline int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
+{
+	return -EOPNOTSUPP;
+}
+#endif