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usb: usb251xb: add usb data lane port swap feature

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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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marco Felsch 2019-01-16 15:20:37 +01:00 committed by Greg Kroah-Hartman
parent 5d6353fe69
commit 02a50b8750
1 changed files with 13 additions and 2 deletions
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15
drivers/usb/misc/usb251xb.c
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@ -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 +541,16 @@ static int usb251xb_get_ofdata(struct usb251xb *hub,
(wchar_t *)hub->serial,
USB251XB_STRING_BUFSIZE);
/*
* The datasheet documents the register as 'Port Swap' but in real the
* register controls the USB DP/DM signal swapping for each port.
*/
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.
*/
@ -546,7 +558,6 @@ 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;