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authorLukasz Majewski <l.majewski@samsung.com>2015-01-23 13:14:20 +0100
committerEduardo Valentin <edubezval@gmail.com>2015-01-24 17:33:14 -0400
commite725d26c4857e5e41975b5e74e64ce6ab09a7121 (patch)
treec7fcd2f4a123a72363e35d1e98f9f333fd600135 /drivers/cpufreq
parent1fe391bf0234add380245dea2dd72220394fe5fd (diff)
downloadlinux-e725d26c4857e5e41975b5e74e64ce6ab09a7121.tar.bz2
cpufreq: exynos: Use device tree to determine if cpufreq cooling should be registered
With thermal subsystem rework it is necessary to tune current cpufreq code to use cpu frequency change as a potential cooling device. Now the cpu cooling device is registered only when proper nodes and properties are available in device tree. Lack of them, however, will not prevent cpufreq for normal operation. Signed-off-by: Lukasz Majewski <l.majewski@samsung.com> Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/exynos-cpufreq.c33
1 files changed, 32 insertions, 1 deletions
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index f99a0b0b7c06..5e98c6b1f284 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -18,10 +18,13 @@
#include <linux/cpufreq.h>
#include <linux/platform_device.h>
#include <linux/of.h>
+#include <linux/cpu_cooling.h>
+#include <linux/cpu.h>
#include "exynos-cpufreq.h"
static struct exynos_dvfs_info *exynos_info;
+static struct thermal_cooling_device *cdev;
static struct regulator *arm_regulator;
static unsigned int locking_frequency;
@@ -156,6 +159,7 @@ static struct cpufreq_driver exynos_driver = {
static int exynos_cpufreq_probe(struct platform_device *pdev)
{
+ struct device_node *cpus, *np;
int ret = -EINVAL;
exynos_info = kzalloc(sizeof(*exynos_info), GFP_KERNEL);
@@ -198,9 +202,36 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
/* Done here as we want to capture boot frequency */
locking_frequency = clk_get_rate(exynos_info->cpu_clk) / 1000;
- if (!cpufreq_register_driver(&exynos_driver))
+ ret = cpufreq_register_driver(&exynos_driver);
+ if (ret)
+ goto err_cpufreq_reg;
+
+ cpus = of_find_node_by_path("/cpus");
+ if (!cpus) {
+ pr_err("failed to find cpus node\n");
+ return 0;
+ }
+
+ np = of_get_next_child(cpus, NULL);
+ if (!np) {
+ pr_err("failed to find cpus child node\n");
+ of_node_put(cpus);
return 0;
+ }
+
+ if (of_find_property(np, "#cooling-cells", NULL)) {
+ cdev = of_cpufreq_cooling_register(np,
+ cpu_present_mask);
+ if (IS_ERR(cdev))
+ pr_err("running cpufreq without cooling device: %ld\n",
+ PTR_ERR(cdev));
+ }
+ of_node_put(np);
+ of_node_put(cpus);
+
+ return 0;
+err_cpufreq_reg:
dev_err(&pdev->dev, "failed to register cpufreq driver\n");
regulator_put(arm_regulator);
err_vdd_arm: