[PATCH 4/8] thermal:cpu cooling:spear: Provide deferred probing for spear driver

Lukasz Majewski
2014-11-13T17:03:30Z

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/spear_thermal.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c
index 1e2193f..fd8fadf5 100644
--- a/drivers/thermal/spear_thermal.c
+++ b/drivers/thermal/spear_thermal.c
@@ -24,6 +24,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
+#include <linux/cpufreq.h>

#define MD_FACTOR 1000

@@ -107,6 +108,12 @@ static int spear_thermal_probe(struct platform_device *pdev)
struct resource *res;
int ret = 0, val;

+#ifdef CONFIG_CPU_THERMAL
+ if (!cpufreq_get_current_driver()) {
+ dev_dbg(&pdev->dev, "no cpufreq driver!");
+ return -EPROBE_DEFER;
+ }
+#endif
if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
return -EINVAL;
--
2.0.0.rc2