[PATCH 2/2] usb: add support for barebox,dr_mode

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

It's not rare to have barebox configure a USB-A port as peripheral or
OTG, because it's used for initial bootstrap of the system with a
non-spec compliant cable.

Allow for this reason to set a barebox,dr_mode that barebox will use
instead of dr_mode if available and Linux will ignore.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/usb/core/of.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c
index bfe0ae315763..3c2ba5a64ae2 100644
--- a/drivers/usb/core/of.c
+++ b/drivers/usb/core/of.c
@@ -36,9 +36,9 @@ static enum usb_dr_mode usb_get_dr_mode_from_string(const char *str)
  * usb_get_dr_mode - Get dual role mode for given device
  * @dev:	Pointer to the given device
  *
- * The function gets phy interface string from property 'dr_mode',
- * in the given device's device tree node and returns the correspondig
- * enum usb_dr_mode
+ * The function gets phy interface string from property 'barebox,dr_mode'
+ * or 'dr_mode' in the given device's device tree node and returns the
+ * correspondig enum usb_dr_mode
  */
 enum usb_dr_mode usb_get_dr_mode(struct device *dev)
 {
@@ -46,7 +46,9 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
 	const char *dr_mode;
 	int err;
 
-	err = of_property_read_string(np, "dr_mode", &dr_mode);
+	err = of_property_read_string(np, "barebox,dr_mode", &dr_mode);
+	if (err < 0)
+		err = of_property_read_string(np, "dr_mode", &dr_mode);
 	if (err < 0)
 		return USB_DR_MODE_UNKNOWN;
 
-- 
2.47.3