MediaTek SGMIISYS controller
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The MediaTek SGMIISYS controller provides various clocks to the system.

Required Properties:

- compatible: Should be:
	- "mediatek,mt7622-sgmiisys", "syscon"
	- "mediatek,mt7629-sgmiisys", "syscon"
- #clock-cells: Must be 1
- mediatek,physpeed: Should be one of "auto", "1000" or "2500" to match up
		     the capability of the target PHY.

The SGMIISYS controller uses the common clk binding from
Documentation/devicetree/bindings/clock/clock-bindings.txt
The available clocks are defined in dt-bindings/clock/mt*-clk.h.

Example:

sgmiisys: sgmiisys@1b128000 {
	compatible = "mediatek,mt7622-sgmiisys", "syscon";
	reg = <0 0x1b128000 0 0x1000>;
	#clock-cells = <1>;
};