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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This adds two functions to get DT properties "mentor,power" and "dr_mode":
musb_get_power() and musb_mode musb_get_mode()

Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx>
---
 drivers/usb/musb/musb_core.c | 37 +++++++++++++++++++++++++++++++++++++
 drivers/usb/musb/musb_core.h | 20 ++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index c3791a0..0836375 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 +130,42 @@ 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:
+		return MUSB_OTG;
+	default:
+		return MUSB_UNDEFINED;
+	}
+}
+EXPORT_SYMBOL_GPL(musb_get_mode);
+
+#ifdef CONFIG_OF
+u8 musb_get_power(struct device *dev)
+{
+	int ret;
+	unsigned power_ma;
+
+	/* the "mentor,power" value is in milliamperes, whereas
+	 * the mentor configuration is in 2mA units
+	 */
+	ret = of_property_read_u32(dev->of_node, "mentor,power", &power_ma);
+	if (ret)
+		return 0;
+
+	return power_ma > 510 ? 255 : power_ma / 2;
+}
+EXPORT_SYMBOL_GPL(musb_get_power);
+#endif
+
 /*-------------------------------------------------------------------------*/
 
 #ifndef CONFIG_BLACKFIN
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index fd215fb..89d6290 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -614,4 +614,24 @@ 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 returns MUSB_UNDEFINED
+ */
+extern enum musb_mode musb_get_mode(struct device *dev);
+
+#if IS_ENABLED(CONFIG_OF)
+/* gets the "mentor,power" property from DT
+ * and converts it from mA to 2mA units for the "power" parameter
+ * in struct musb_hdrc_platform_data
+ *
+ * in case the property is not found returns 0
+ */
+extern u8 musb_get_power(struct device *dev);
+#else
+static inline u8 musb_get_power(struct device *dev)
+{
+	return 0;
+}
+#endif
+
 #endif	/* __MUSB_CORE_H__ */
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux