usb: dwc3: drd: Add support for usb-conn-gpio based usb-role-switch

usb-conn-gpio devices are a subnode of the USB interface controller, which
needs to be populated.
This allows having a non-type-c connector providing dual-role.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20220105071407.2240302-1-alexander.stein@ew.tq-group.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index d7f76835137faab0c7168992480f7944cba39008..25f322e62d3f7a7413b676d7800d33b1ece74b2e 100644 (file)
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -9,6 +9,7 @@
 
 #include <linux/extcon.h>
 #include <linux/of_graph.h>
+#include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 
@@ -559,6 +560,18 @@ static int dwc3_setup_role_switch(struct dwc3 *dwc)
        if (IS_ERR(dwc->role_sw))
                return PTR_ERR(dwc->role_sw);
 
+       if (IS_ENABLED(CONFIG_OF)) {
+               /* populate connector entry */
+               int ret = devm_of_platform_populate(dwc->dev);
+
+               if (ret) {
+                       usb_role_switch_unregister(dwc->role_sw);
+                       dwc->role_sw = NULL;
+                       dev_err(dwc->dev, "DWC3 platform devices creation failed: %i\n", ret);
+                       return ret;
+               }
+       }
+
        dwc3_set_mode(dwc, mode);
        return 0;
 }