cpufreq:exynos:Extend Exynos cpufreq driver to support boost framework

The struct cpufreq_driver has been extended to embrace the information
related to boost support.

When "boost_mode" device tree attribute is defined for a platform, the
boost_supported flag is set. Moreover boost related attributes were
exported.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>

Changes for v6:
- replace exynos_driver.boost_supported = 1 to = true

Changes for v5:
- None

Changes for v4:
- None

Changes for v3:
- Remove low level boost code
- Move boost management code to cpufreq core code
- Use boost_supported flag to indicate if driver supports over clocking

Changes for v2:
- Removal of struct cpufreq_boost
- Removal of the CONFIG_CPU_FREQ_BOOST flag
- low_level_boost with valid address when boost is supported

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index aa869debe8e..3704b516fce 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -264,6 +264,7 @@ static int exynos_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 
 static struct freq_attr *exynos_cpufreq_attr[] = {
 	&cpufreq_freq_attr_scaling_available_freqs,
+	&cpufreq_freq_attr_scaling_boost_freqs,
 	NULL,
 };
 
@@ -404,6 +405,7 @@ static struct of_device_id exynos_cpufreq_of_match[] = {
 
 static int exynos_cpufreq_probe(struct platform_device *pdev)
 {
+	struct device_node *node = pdev->dev.of_node;
 	int ret = -EINVAL;
 
 	exynos_info = kzalloc(sizeof(struct exynos_dvfs_info), GFP_KERNEL);
@@ -436,6 +438,8 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
 	}
 
 	locking_frequency = exynos_getspeed(0);
+	if (of_property_read_bool(node, "boost_mode"))
+		exynos_driver.boost_supported = true;
 
 	register_pm_notifier(&exynos_cpufreq_nb);