This adds two functions to get DT properties "mentor,power" and "dr_mode":
musb_get_power() and musb_get_mode()
Signed-off-by: Petr Kulhavy <petr@xxxxxxxxx>
---
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
drivers/usb/musb/musb_core.c | 37 +++++++++++++++++++++++++++++++++++++
drivers/usb/musb/musb_core.h | 15 +++++++++++++++
2 files changed, 52 insertions(+)
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index c3791a0..ff7f5d0 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:
+ case USB_DR_MODE_UNKNOWN:
+ default:
+ return MUSB_OTG;
+ }
+}
+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..c2ee702 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -614,4 +614,19 @@ 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);
+
+#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);
+#endif
+
#endif /* __MUSB_CORE_H__ */
--
1.9.1
--
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