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* Atmel AC97 controller

Required properties:
  - compatible: "atmel,at91sam9263-ac97c"
  - reg: Address and length of the register set for the device
  - interrupts: Should contain AC97 interrupt
  - ac97-gpios: Please refer to soc-ac97link.txt, only ac97-reset is used
Optional properties:
  - pinctrl-names, pinctrl-0: Please refer to pinctrl-bindings.txt

Example:
sound@fffa0000 {
       compatible = "atmel,at91sam9263-ac97c";
       pinctrl-names = "default";
       pinctrl-0 = <&pinctrl_ac97>;
       reg = <0xfffa0000 0x4000>;
       interrupts = <18 IRQ_TYPE_LEVEL_HIGH 5>;

       ac97-gpios = <&pioB 0 0 &pioB 2 0 &pioC 29 GPIO_ACTIVE_LOW>;
};