MediaTek Power Management Interface (PMIF) Driver

This document describes the binding for the MediaTek PMIF.

The PMIF is designed on MediaTek's SoC.  It implements arbitration logic
to allow for multiple HW/SW channel to control PMIC by a single SPMI master.

See spmi.txt for the generic SPMI controller binding requirements for child
nodes.

See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt for
generic interrupt controller binding documentation.

Required properties:
- compatible:
	"mediatek,mt6789-pmif" for MT6789 SoCs
- reg : address + size pairs describing the pmif/pmifmpu/spmimst register
  sets. Must contain an entry for each entry in reg-names.
- reg-names: must contain:
     "pmif" - power management interface registers
     "pmifmpu" - pmif memory protection unit registers
     "spmimst" - spmi master registers
- interrupts: IRQ for pmif in SOC
- interrupt-names: IRQ name for pmif in SOC
- swinf_ch_start: indicate the physical channel for pmif driver accessing
- ap_swinf_no: indicate the logical channel for ap sw interface number,
  0: for MD interface
  2: for AP interface
- interrupt-controller: indicator that the pmif is an interrupt controller

Optional properities:

Example:
	spmi_bus: spmi@10027000 {
  		compatible = "mediatek,mt6789-pmif";
		reg = <0 0x10027000 0 0x000E00>,
  		      <0 0x10027F00 0 0x00008C>,
      		      <0 0x10029000 0 0x000100>;
		reg-names = "pmif", "pmifmpu", "spmimst";
		interrupts = <GIC_SPI 190 IRQ_TYPE_LEVEL_HIGH>;
		interrupt-names = "pmif_irq";
		swinf_ch_start = <4>;
		ap_swinf_no = <2>;
		interrupt-controller;
 	};