[PATCH 3/8] thermal:cpu cooling:rcar: Provide deferred probing for rcar driver

Lukasz Majewski
2014-11-13T17:03:23Z

When CPU freq is used as a thermal zone cooling device, one needs to wait
until cpufreq subsystem is properly initialized.

This code is similar to the one already available in imx_thermal.c file.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
---
drivers/thermal/rcar_thermal.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 8803e69..b268b4d 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/thermal.h>
+#include <linux/cpufreq.h>

#define IDLE_INTERVAL 5000

@@ -373,6 +374,12 @@ static int rcar_thermal_probe(struct platform_device *pdev)
int ret = -ENODEV;
int idle = IDLE_INTERVAL;

+#ifdef CONFIG_CPU_THERMAL
+ if (!cpufreq_get_current_driver()) {
+ dev_dbg(&pdev->dev, "no cpufreq driver!");
+ return -EPROBE_DEFER;
+ }
+#endif
common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
if (!common)
return -ENOMEM;
--
2.0.0.rc2