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

Message ID 1415898165-27406-5-git-send-email-l.majewski@samsung.com
State Not Applicable, archived
Headers show

Commit Message

Łukasz Majewski Nov. 13, 2014, 5:02 p.m. UTC 
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(+)
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Patch

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;