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Diffstat (limited to 'drivers/usb/common')
-rw-r--r--drivers/usb/common/common.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 347fb3d3894a..c9bdeb4ddcb5 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -201,6 +201,26 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
EXPORT_SYMBOL_GPL(usb_get_dr_mode);
/**
+ * usb_get_role_switch_default_mode - Get default mode for given device
+ * @dev: Pointer to the given device
+ *
+ * The function gets string from property 'role-switch-default-mode',
+ * and returns the corresponding enum usb_dr_mode.
+ */
+enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev)
+{
+ const char *str;
+ int ret;
+
+ ret = device_property_read_string(dev, "role-switch-default-mode", &str);
+ if (ret < 0)
+ return USB_DR_MODE_UNKNOWN;
+
+ return usb_get_dr_mode_from_string(str);
+}
+EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode);
+
+/**
* usb_decode_interval - Decode bInterval into the time expressed in 1us unit
* @epd: The descriptor of the endpoint
* @speed: The speed that the endpoint works as