Quoting Robert Hancock (2021-03-25 12:26:35)

Add new silabs,xaxb-ext-clk and silabs,iovdd-33 properties.

Changed vdd-supply on top-level node to optional since it is not actually
used by the driver.

Removed vdd-supply from output sub-nodes, as it was not supported by the
driver and it is not easily possible to support this in that location with
the kernel regulator infrastructure. Changed to have vddoX-supply
attributes for each output on the top-level device node.

Signed-off-by: Robert Hancock <redacted>
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Applied to clk-next