u-boot/drivers/usb/Kconfig
Fabrice Gasnier ba1fa2abde usb: onboard-hub: add driver to manage onboard hub supplies
The main issue the driver addresses is that a USB hub needs to be
powered before it can be discovered. This is often solved by using
"regulator-always-on".

This driver is inspired by the Linux v6.1 driver. It only enables (or
disables) the hub vdd (3v3) supply, so it can be enumerated.
Scanning of the device tree is done in a similar manner to the sandbox,
by the usb-uclass. DT part looks like:

&usbh_ehci {
	...
	#address-cells = <1>;
	#size-cells = <0>;
	hub@1 {
		compatible = "usb424,2514";
		reg = <1>;
		vdd-supply = <&v3v3>;
	};
};

When the bus gets probed, the driver is automatically probed/removed from
the bus tree, as an example on stm32:
STM32MP> usb start
starting USB...
STM32MP> dm tree
 Class     Index  Probed  Driver                Name
-----------------------------------------------------------
 usb           0  [ + ]   ehci_generic          |   |-- usb@5800d000
 usb_hub       0  [ + ]   usb_onboard_hub       |   |   `-- hub@1
 usb_hub       1  [ + ]   usb_hub               |   |       `-- usb_hub

STM32MP> usb tree
USB device tree:
  1  Hub (480 Mb/s, 0mA)
  |  u-boot EHCI Host Controller
  |
  +-2  Hub (480 Mb/s, 2mA)

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2023-01-12 16:19:53 +01:00

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4.2 KiB
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menuconfig USB
bool "USB support"
---help---
Universal Serial Bus (USB) is a specification for a serial bus
subsystem which offers higher speeds and more features than the
traditional PC serial port. The bus supplies power to peripherals
and allows for hot swapping. Up to 127 USB peripherals can be
connected to a single USB host in a tree structure.
The USB host is the root of the tree, the peripherals are the
leaves and the inner nodes are special USB devices called hubs.
Most PCs now have USB host ports, used to connect peripherals
such as scanners, keyboards, mice, modems, cameras, disks,
flash memory, network links, and printers to the PC.
Say Y here if your device has an USB port, either host, peripheral or
dual-role.
For an USB host port, you then need to say Y to at least one of the
Host Controller Driver (HCD) options below. Choose a USB 1.1
controller, such as "UHCI HCD support" or "OHCI HCD support",
and "EHCI HCD (USB 2.0) support" except for older systems that
do not have USB 2.0 support. It doesn't normally hurt to select
them all if you are not certain.
If your system has a device-side USB port, used in the peripheral
side of the USB protocol, see the "USB Gadget" framework instead.
After choosing your HCD, then select drivers for the USB peripherals
you'll be using. You may want to check out the information provided
in <file:Documentation/usb/> and especially the links given in
<file:Documentation/usb/usb-help.txt>.
if USB
config DM_USB
bool
depends on DM && OF_CONTROL
help
Enable driver model for USB. The USB interface is then implemented
by the USB uclass. Multiple USB controllers of different types
(XHCI, EHCI, OHCI) can be attached and used. The 'usb' command works
as normal.
Much of the code is shared but with this option enabled the USB
uclass takes care of device enumeration. USB devices can be
declared with the U_BOOT_USB_DEVICE() macro and will be
automatically probed when found on the bus.
config SPL_DM_USB
bool "Enable driver model for USB host mode in SPL"
depends on SPL_DM && DM_USB
default n if ARCH_MVEBU
default y
config DM_USB_GADGET
bool "Enable driver model for USB Gadget"
depends on DM_USB
help
Enable driver model for USB Gadget (Peripheral
mode)
config SPL_DM_USB_GADGET
bool "Enable driver model for USB Gadget in SPL"
depends on SPL_DM_USB
help
Enable driver model for USB Gadget in SPL
(Peripheral mode)
source "drivers/usb/host/Kconfig"
source "drivers/usb/isp1760/Kconfig"
source "drivers/usb/cdns3/Kconfig"
source "drivers/usb/dwc3/Kconfig"
source "drivers/usb/mtu3/Kconfig"
source "drivers/usb/musb/Kconfig"
source "drivers/usb/musb-new/Kconfig"
source "drivers/usb/emul/Kconfig"
source "drivers/usb/phy/Kconfig"
source "drivers/usb/ulpi/Kconfig"
if USB_HOST
comment "USB peripherals"
config USB_STORAGE
bool "USB Mass Storage support"
---help---
Say Y here if you want to connect USB mass storage devices to your
board's USB port.
config USB_KEYBOARD
bool "USB Keyboard support"
select DM_KEYBOARD if DM_USB
select SYS_STDIO_DEREGISTER
---help---
Say Y here if you want to use a USB keyboard for U-Boot command line
input.
config USB_ONBOARD_HUB
bool "Onboard USB hub support"
depends on DM_USB
---help---
Say Y here if you want to support discrete onboard USB hubs that
don't require an additional control bus for initialization, but
need some non-trivial form of initialization, such as enabling a
power regulator. An example for such a hub is the Microchip
USB2514B.
if USB_KEYBOARD
config USB_KEYBOARD_FN_KEYS
bool "USB keyboard function key support"
help
Say Y here if you want support for keys F1 - F12, INS, HOME, DELETE,
END, PAGE UP, and PAGE DOWN.
choice
prompt "USB keyboard polling"
default SYS_USB_EVENT_POLL_VIA_INT_QUEUE if ARCH_SUNXI
default SYS_USB_EVENT_POLL
---help---
Enable a polling mechanism for USB keyboard.
config SYS_USB_EVENT_POLL
bool "Interrupt polling"
config SYS_USB_EVENT_POLL_VIA_INT_QUEUE
bool "Poll via interrupt queue"
config SYS_USB_EVENT_POLL_VIA_CONTROL_EP
bool "Poll via control EP"
endchoice
endif
source "drivers/usb/eth/Kconfig"
endif
source "drivers/usb/gadget/Kconfig"
endif