The RK3288 datasheet does not mention support for DDR mode, so mmc-ddr-1_8v surprises me a bit. The datasheet does explicitly mention that HS400 is _not_ supported. USB: Another change with the Plus version of the R2S is that the USB 2.0 port that used to be wired to the ethernet chip now is used for an external USB port. I donâ??t have the hardware here (yet), so can't test if that USB 2.0 and the USB 3.0 work independently or need to be explicitly separated. refs: Documentation/devicetree/bindings/mmc/mmc-controller.yaml
