usb: wrong compatible string for MX23?

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Hi Peter,

i was inspired by the discussion about the USB runtime suspend issue on MX28. I
think i've found another issue.
In the dtsi for the MX23 the usb node has the following compatible:

usb0: usb@80080000 {
        compatible = "fsl,imx23-usb", "fsl,imx27-usb";
...

But in ci_hdrc_imx.c there is only "fsl,imx27-usb" and "fsl,imx28-usb" defined.

So in case of a MX23 board it would fallback to "fsl,imx27-usb", which is IMHO
not correct.

Which way to fix this issue would you suggest:

a) extend ci_hdrc_imx.c and the binding by copying the imx28 platform and name
it imx23

b) rename the compatible string from "fsl,imx23-usb" to "fsl-imx28-usb"

Best regards
Stefan
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