the following ones are optional:
"ref_ck": reference clock used by low power mode etc,
"mcu_ck": mcu_bus clock for register access,
- "dma_ck": dma_bus clock for data transfer by DMA
+ "dma_ck": dma_bus clock for data transfer by DMA,
+ "xhci_ck": controller clock
- phys : see usb-hcd.txt in the current directory
- clocks : a list of phandle + clock-specifier pairs, one for each
entry in clock-names
- clock-names : must contain "sys_ck", and the following ones are optional:
- "ref_ck", "mcu_ck" and "dma_ck"
+ "ref_ck", "mcu_ck" and "dma_ck", "xhci_ck"
Optional properties:
- vbus-supply : reference to the VBUS regulator;