phy: rockchip-inno-usb2: add support for rockchip,usbgrf property
The registers of usb-phy are distributed in grf and usbgrf on some Rockchip SoCs (e.g RV1108), this patch add a new rockchip,usbgrf property to support this companion grf design. Signed-off-by: Frank Wang <frank.wang@rock-chips.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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