* APM X-Gene SoC EDAC node

EDAC node is defined to describe on-chip error detection and correction.
The follow error types are supported:

  memory controller	- Memory controller
  PMD (L1/L2)		- Processor module unit (PMD) L1/L2 cache

The following section describes the EDAC DT node binding.

Required properties:
- compatible		: Shall be "apm,xgene-edac".
- regmap-csw		: Regmap of the CPU switch fabric (CSW) resource.
- regmap-mcba		: Regmap of the MCB-A (memory bridge) resource.
- regmap-mcbb		: Regmap of the MCB-B (memory bridge) resource.
- regmap-efuse		: Regmap of the PMD efuse resource.
- reg			: First resource shall be the CPU bus (PCP) resource.
- interrupts            : Interrupt-specifier for MCU, PMD, L3, or SoC error
			  IRQ(s).

Required properties for memory controller subnode:
- compatible		: Shall be "apm,xgene-edac-mc".
- reg			: First resource shall be the memory controller unit
                          (MCU) resource.
- memory-controller	: Instance number of the memory controller.

Required properties for PMD subnode:
- compatible		: Shall be "apm,xgene-edac-pmd" or
                          "apm,xgene-edac-pmd-v2".
- reg			: First resource shall be the PMD resource.
- pmd-controller	: Instance number of the PMD controller.

Example:
	csw: csw@7e200000 {
		compatible = "apm,xgene-csw", "syscon";
		reg = <0x0 0x7e200000 0x0 0x1000>;
	};

	mcba: mcba@7e700000 {
		compatible = "apm,xgene-mcb", "syscon";
		reg = <0x0 0x7e700000 0x0 0x1000>;
	};

	mcbb: mcbb@7e720000 {
		compatible = "apm,xgene-mcb", "syscon";
		reg = <0x0 0x7e720000 0x0 0x1000>;
	};

	efuse: efuse@1054a000 {
		compatible = "apm,xgene-efuse", "syscon";
		reg = <0x0 0x1054a000 0x0 0x20>;
	};

	edac@78800000 {
		compatible = "apm,xgene-edac";
		#address-cells = <2>;
		#size-cells = <2>;
		ranges;
		regmap-csw = <&csw>;
		regmap-mcba = <&mcba>;
		regmap-mcbb = <&mcbb>;
		regmap-efuse = <&efuse>;
		reg = <0x0 0x78800000 0x0 0x100>;
		interrupts = <0x0 0x20 0x4>,
			     <0x0 0x21 0x4>,
			     <0x0 0x27 0x4>;

		edacmc@7e800000 {
			compatible = "apm,xgene-edac-mc";
			reg = <0x0 0x7e800000 0x0 0x1000>;
			memory-controller = <0>;
		};

		edacpmd@7c000000 {
			compatible = "apm,xgene-edac-pmd";
			reg = <0x0 0x7c000000 0x0 0x200000>;
			pmd-controller = <0>;
		};
	};