* Mediatek Secure Power Management

This describes the device tree binding for the Mediatek Secure Power Managermenet
which control low power on/off. such as cpu on/off, pll on/off, and lower voltage
for each power domain.

Required properties:
- compatible:
  - "mediatek,sleep" : For all compatible products support spm
- reg: 1. Address base and range for SPMFW loading.
       2. Address base for device_mpu
- interrupts: IRQ for SPM wake up AP

Example:

	sleep@10a00000 {
		compatible = "mediatek,sleep";
		reg = <0 0x10a00000 0 0x30000>,
		      <0 0x0011bb80 0 0x80>;
		interrupts = <GIC_SPI 196 IRQ_TYPE_LEVEL_LOW>;
	};
