ehci-orion does not set USB mode for DT devices

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Hi,

While porting mainline U-Boot to the Synology DS414 NAS, I noticed that
usb_add_hcd() fails if the single USB port's mode wasn't set previously
by U-Boot.

I tracked down the problem to ehci_orion_drv_probe(), which does not
call orion_usb_phy_v1_setup() for devices exported by DT. It looks like
this is intentional, so my question is: Should Linux set the mode
(ideally based on dr_mode DT attribute) or is this supposed to be done
by the boot loader?

Thanks, Phil
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