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Atmel AT91RM9200 CompactFlash

Required properties:
- compatible : "atmel,at91rm9200-cf".
- reg : should specify localbus address and size used.
- gpios : specifies the gpio pins to control the CF device. Detect
  and reset gpio's are mandatory while irq and vcc gpio's are
  optional and may be set to 0 if not present.

Example:
compact-flash@50000000 {
	compatible = "atmel,at91rm9200-cf";
	reg = <0x50000000 0x30000000>;
	gpios = <&pioC 13 0	/* irq */
		 &pioC 15 0 	/* detect */
		 0		/* vcc */
		 &pioC  5 0	/* reset */
		>;
};