diff mbox series

[2/2] usb: usb251xb: add usb data lane port swap feature

Message ID 20181219145941.5173-2-m.felsch@pengutronix.de (mailing list archive)
State New, archived
Headers show
Series [1/2] dt-bindings: usb: usb251xb: add documentation for data lane swapping | expand

Commit Message

Marco Felsch Dec. 19, 2018, 2:59 p.m. UTC 
The HW can swap the USB differential-pair (D+/D-) for each port
separately. So the USB signals can be re-aligned with a misplaced
USB connector on the PCB.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 drivers/usb/misc/usb251xb.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index a6efb9a72939..cd89618e11f1 100644
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -337,10 +337,12 @@  static int usb251xb_get_ofdata(struct usb251xb *hub,
 	struct device *dev = hub->dev;
 	struct device_node *np = dev->of_node;
 	int len, err, i;
-	u32 property_u32 = 0;
+	u32 port, property_u32 = 0;
 	const u32 *cproperty_u32;
 	const char *cproperty_char;
 	char str[USB251XB_STRING_BUFSIZE / 2];
+	struct property *prop;
+	const __be32 *p;
 
 	if (!np) {
 		dev_err(dev, "failed to get ofdata\n");
@@ -539,6 +541,12 @@  static int usb251xb_get_ofdata(struct usb251xb *hub,
 			      (wchar_t *)hub->serial,
 			      USB251XB_STRING_BUFSIZE);
 
+	hub->port_swap = USB251XB_DEF_PORT_SWAP;
+	of_property_for_each_u32(np, "sw-dx-lanes-ports", prop, p, port) {
+		if ((port >= 0) && (port <= data->port_cnt))
+			hub->port_swap |= BIT(port);
+	}
+
 	/* The following parameters are currently not exposed to devicetree, but
 	 * may be as soon as needed.
 	 */
@@ -546,7 +554,6 @@  static int usb251xb_get_ofdata(struct usb251xb *hub,
 	hub->boost_up = USB251XB_DEF_BOOST_UP;
 	hub->boost_57 = USB251XB_DEF_BOOST_57;
 	hub->boost_14 = USB251XB_DEF_BOOST_14;
-	hub->port_swap = USB251XB_DEF_PORT_SWAP;
 	hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
 	hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
 	hub->port_map56 = USB251XB_DEF_PORT_MAP_56;