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authorAndrey Smirnov <andrew.smirnov@gmail.com>2019-02-19 23:29:30 -0800
committerSascha Hauer <s.hauer@pengutronix.de>2019-02-22 08:27:55 +0100
commit1192a7add658e93ba9242a2fc53a23108eb05e8c (patch)
treee3c6a8cd1ddd3095c146471e5dc69e2b15604414 /drivers
parent937fa50d9c2a693a7cdc3780d1398ef628fe5e03 (diff)
downloadbarebox-1192a7add658e93ba9242a2fc53a23108eb05e8c.tar.gz
barebox-1192a7add658e93ba9242a2fc53a23108eb05e8c.tar.xz
usb: usb251xb: add usb data lane port swap feature
Port of Linux patch https://patchwork.kernel.org/patch/10766235/ 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> Reviewed-by: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/misc/usb251xb.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/usb/misc/usb251xb.c b/drivers/usb/misc/usb251xb.c
index 0b721f6d47..97f55efa82 100644
--- a/drivers/usb/misc/usb251xb.c
+++ b/drivers/usb/misc/usb251xb.c
@@ -340,12 +340,14 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
struct device_d *dev = hub->dev;
struct device_node *np = dev->device_node;
int len, err, i;
- u32 property_u32 = 0;
+ u32 port, property_u32 = 0;
const u32 *cproperty_u32;
const char *cproperty_char;
enum of_gpio_flags of_flags;
unsigned long flags = GPIOF_OUT_INIT_ACTIVE;
char str[USB251XB_STRING_BUFSIZE / 2];
+ struct property *prop;
+ const __be32 *p;
if (!np) {
dev_err(dev, "failed to get ofdata\n");
@@ -556,6 +558,16 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
(wchar_t *)hub->serial,
USB251XB_STRING_BUFSIZE);
+ /*
+ * The datasheet documents the register as 'Port Swap' but the register
+ * controls the USB DP/DM signal swapping
+ */
+ hub->port_swap = USB251XB_DEF_PORT_SWAP;
+ of_property_for_each_u32(np, "swap-dx-lanes", 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.
*/
@@ -563,7 +575,6 @@ 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;