[PATCH 2/5 v10] usb: musb: core: added helper function for parsing DT

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This adds the function musb_get_mode() to get the DT property "dr_mode"

Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx>
Acked-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
---
v4: <initial>
 - created musb_get_dr_mode()

v5:
 - musb_get_dr_mode() renamed to musb_get_mode()
 - added musb_get_power()

v6:
 - musb_get_power() : added missing boundary check for the maximum value 510mA
 - formatting
 - added empty implementation of musb_get_power()

v7:
 - removed empty implementation of musb_get_power()
 - musb_get_mode() returns MUSB_OTG if the property is not found

v8:
 - musb_get_power() removed

v9: <no change>
v10: <no change>

 drivers/usb/musb/musb_core.c | 19 +++++++++++++++++++
 drivers/usb/musb/musb_core.h |  5 +++++
 2 files changed, 24 insertions(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index c3791a0..6a2d6d3 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -100,6 +100,7 @@
 #include <linux/io.h>
 #include <linux/dma-mapping.h>
 #include <linux/usb.h>
+#include <linux/usb/of.h>
 
 #include "musb_core.h"
 
@@ -129,6 +130,24 @@ static inline struct musb *dev_to_musb(struct device *dev)
 	return dev_get_drvdata(dev);
 }
 
+enum musb_mode musb_get_mode(struct device *dev)
+{
+	enum usb_dr_mode mode;
+
+	mode = usb_get_dr_mode(dev);
+	switch (mode) {
+	case USB_DR_MODE_HOST:
+		return MUSB_HOST;
+	case USB_DR_MODE_PERIPHERAL:
+		return MUSB_PERIPHERAL;
+	case USB_DR_MODE_OTG:
+	case USB_DR_MODE_UNKNOWN:
+	default:
+		return MUSB_OTG;
+	}
+}
+EXPORT_SYMBOL_GPL(musb_get_mode);
+
 /*-------------------------------------------------------------------------*/
 
 #ifndef CONFIG_BLACKFIN
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index fd215fb..3f7a325 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -614,4 +614,9 @@ static inline void musb_platform_post_root_reset_end(struct musb *musb)
 		musb->ops->post_root_reset_end(musb);
 }
 
+/* gets the "dr_mode" property from DT and converts it into musb_mode
+ * if the property is not found or not recognized returns MUSB_OTG
+ */
+extern enum musb_mode musb_get_mode(struct device *dev);
+
 #endif	/* __MUSB_CORE_H__ */
-- 
1.9.1

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