usb: xhci-dwc3: Support role switch default role
When the device tree indicates support for role switching through
the "usb-role-switch" property, take the "role-switch-default-mode"
property into account when deciding which role to put the
controller into.
This makes USB devices work on Apple M1 systems where the device
tree may include a "dr_mode" property that is set to "otg", but
where we need to put the controller into "host" mode to see
devices connected to the type-C ports.
Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index ee0c064..cff86a5 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -40,6 +40,22 @@
return USB_DR_MODE_UNKNOWN;
}
+enum usb_dr_mode usb_get_role_switch_default_mode(ofnode node)
+{
+ const char *dr_mode;
+ int i;
+
+ dr_mode = ofnode_read_string(node, "role-switch-default-mode");
+ if (!dr_mode)
+ return USB_DR_MODE_UNKNOWN;
+
+ for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
+ if (!strcmp(dr_mode, usb_dr_modes[i]))
+ return i;
+
+ return USB_DR_MODE_UNKNOWN;
+}
+
static const char *const speed_names[] = {
[USB_SPEED_UNKNOWN] = "UNKNOWN",
[USB_SPEED_LOW] = "low-speed",