[PATCH 2/8] thermal:cpu cooling:kirkwood: Provide deferred probing for kirkwood driver

Lukasz Majewski
2014-11-13T17:03:18Z

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

diff --git a/drivers/thermal/kirkwood_thermal.c b/drivers/thermal/kirkwood_thermal.c
index 3b034a0..e938291 100644
--- a/drivers/thermal/kirkwood_thermal.c
+++ b/drivers/thermal/kirkwood_thermal.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
+#include <linux/cpufreq.h>

#define KIRKWOOD_THERMAL_VALID_OFFSET 9
#define KIRKWOOD_THERMAL_VALID_MASK 0x1
@@ -75,6 +76,12 @@ static int kirkwood_thermal_probe(struct platform_device *pdev)
struct kirkwood_thermal_priv *priv;
struct resource *res;

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