usb: gadget: add Aspeed ast2600 udc driver
Aspeed udc is compliant with USB2.0, supports USB High Speed and Full Speed, backward compatible with USB1.1. Supports independent DMA channel for each generic endpoint. Supports 32/256 stages descriptor mode for all generic endpoints. This driver supports full functionality including single/multiple stages descriptor mode, and exposes 1 UDC gadget driver. Signed-off-by: Neal Liu <neal_liu@aspeedtech.com> Link: https://lore.kernel.org/r/20220523030134.2977116-2-neal_liu@aspeedtech.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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