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

Message ID 1415898165-27406-3-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/kirkwood_thermal.c | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

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;