usb: gadget: mv_udc: add clock gating support
This patch is going to support clock gating when vbus detection is posible. Clock and phy will be on only when usb gadget is used(vbus valid). Signed-off-by: NNeil Zhang <zhangwm@marvell.com> Signed-off-by: NFelipe Balbi <balbi@ti.com>
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