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Documentation [1] states that the default value of the dr_mode property is "otg". It also isn't marked a mandatory node, so it may or may not be set. So, accordingly if dr_mode is not mentioned in the devicetree node, OTG mode must be assumed. In this driver however, this case is not handled. If dr_mode is not mentioned, USB_DR_MODE_UNKNOWN is set. The logic implemented raises an error, instead of falling back to USB_DR_MODE_OTG. Correct this to conform to the specification. Link: https://git.kernel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/tree/Bindings/usb/usb-drd.yaml?h=v6.18-dts [1] Reviewed-by: Marek Vasut <marek.vasut@mailbox.org> Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>