u-boot/doc/README.generic_usb_ohci
Tom Rini 65cc0e2a65 global: Move remaining CONFIG_SYS_* to CFG_SYS_*
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do
not easily transition to Kconfig. In many cases they likely should come
from the device tree instead. Move these out of CONFIG namespace and in
to CFG namespace.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2022-12-05 16:06:08 -05:00

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Notes on the the generic USB-OHCI driver
========================================
This driver (drivers/usb/usb_ohci.[ch]) is the result of the merge of
various existing OHCI drivers that were basically identical beside
cpu/board dependant initalization. This initalization has been moved
into cpu/board directories and are called via the hooks below.
Configuration options
----------------------
CONFIG_USB_OHCI_NEW: enable the new OHCI driver
CFG_SYS_USB_OHCI_REGS_BASE: defines the base address of the OHCI
registers
CONFIG_SYS_USB_OHCI_SLOT_NAME: slot name
Endianness issues
------------------
The USB bus operates in little endian, but unfortunately there are
OHCI controllers that operate in big endian such as ppc4xx. For these the
config option
CONFIG_SYS_OHCI_BE_CONTROLLER
needs to be defined.