Add RCAN clock support to the R-Car generation 2 CPG driver. This clock
derived from the USB_EXTAL clock by dividing it by 6. The layout of
register is close to those of the clocks supported by the 'clk-div6'
but has no divider field, and so can't be supported by that driver...
I'm not a clock expert (pulling in Laurent), but it looks fine to me.
While you did add the rcan clock to the dtsi in "[PATCH v3 1/3] ARM:
shmobile: r8a7791: add CAN clocks", I couldn't find a patch to update
the renesas,rcar-gen2-cpg-clocks binding doc?