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usb: xhci-dwc3: Support role switch default role

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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>
This commit is contained in:
Mark Kettenis 2022-04-19 21:06:33 +02:00 • committed by Marek Vasut
parent f83bd23e2a
commit 6a6468f479
3 changed files with 32 additions and 0 deletions
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10
include/linux/usb/otg.h
View file

@ -27,6 +27,16 @@ enum usb_dr_mode {
*/
enum usb_dr_mode usb_get_dr_mode(ofnode node);
/**
* usb_get_dr_mode() - Get dual role mode for given device
* @node: ofnode of the given device
*
* The function gets phy interface string from property
* 'role-switch-defaulr-mode', and returns the correspondig enum
* usb_dr_mode
*/
enum usb_dr_mode usb_get_role_switch_default_mode(ofnode node);
/**
* usb_get_maximum_speed() - Get maximum speed for given device
* @node: ofnode of the given device