linux/drivers/usb/gadget
Yoshihiro Shimoda 39facfa01c usb: gadget: udc: renesas_usb3: Add register of usb role switch
This patch adds role switch support for R-Car SoCs into the USB 3.0
peripheral driver. Some R-Car SoCs (e.g. R-Car H3) have USB 3.0
dual-role device controller which has the USB 3.0 xHCI host and
Renesas USB 3.0 peripheral.

Unfortunately, the mode change register (DRD_CON) contains
the USB 3.0 peripheral controller side only. So, this renesas_usb3
driver manages the DRD_CON now. However, in peripheral mode, the host
should stop. Also the host hardware needs to reinitialize its own
registers when the mode changes from peripheral to host mode.
Otherwise, the host cannot work correctly (e.g. detect a device
as high-speed).

To achieve this reinitialization by a driver, this driver also
registers a role switch driver to manage the DRD_CON and get
a device pointer of usb 3.0 host from "companion" property of OF.
Then, when the usb role is changed, renesas_usb3_role_switch_set()
will attach/release the xhci-plat driver to reinitialize the host
hardware.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
2018-07-30 10:39:17 +03:00
..
function usb: gadget: storage: Remove reference counting 2018-07-26 13:55:39 +03:00
legacy usb: gadget: tcm: fix spelling mistake: "Manufactor" -> "Manufacturer" 2018-07-26 13:35:29 +03:00
udc usb: gadget: udc: renesas_usb3: Add register of usb role switch 2018-07-30 10:39:17 +03:00
composite.c usb: gadget: composite: fix delayed_status race condition when set_interface 2018-06-19 12:48:13 +03:00
config.c USB: gadget: Remove redundant license text 2017-11-07 15:45:02 +01:00
configfs.c usb: gadget: configfs: avoid spaces for indentation 2018-07-26 13:49:49 +03:00
configfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
epautoconf.c USB: gadget: Remove redundant license text 2017-11-07 15:45:02 +01:00
functions.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
Kconfig Revert "usb: gadget: allow to enable legacy drivers without USB_ETH" 2017-12-12 12:48:30 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
u_f.c USB: gadget: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_f.h USB: gadget: f_midi: fixing a possible double-free in f_midi 2018-03-26 11:53:14 +02:00
u_os_desc.h USB: gadget: Remove redundant license text 2017-11-07 15:45:02 +01:00
usbstring.c usb/gadget: Constify usb_gadget_get_string "table" argument 2018-05-15 10:06:49 +03:00