usb: dwc3: adapt to use dr_mode device tree helper
This patch adapts the dwc3 to use the device tree helper "of_usb_get_dr_mode" for the mode of operation of the dwc3 instance being probed. [ balbi@ti.com : make of_usb_get_dr_mode() conditional on dev->of_node and let pdata pass dr_mode too ] Reviewed-by: NRoger Quadros <rogerq@ti.com> Signed-off-by: NRuchika Kharwar <ruchika@ti.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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