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* Nios II Processor Binding

This binding specifies what properties available in the device tree
representation of a Nios II Processor Core.

Users can use sopc2dts tool for generating device tree sources (dts) from a
Qsys system. See more detail in: http://www.alterawiki.com/wiki/Sopc2dts

Required properties:

- compatible: Compatible property value should be "altr,nios2-1.0".
- reg: Contains CPU index.
- interrupt-controller: Specifies that the node is an interrupt controller
- #interrupt-cells: Specifies the number of cells needed to encode an
		interrupt source, should be 1.
- clock-frequency: Contains the clock frequency for CPU, in Hz.
- dcache-line-size: Contains data cache line size.
- icache-line-size: Contains instruction line size.
- dcache-size: Contains data cache size.
- icache-size: Contains instruction cache size.
- altr,pid-num-bits: Specifies the number of bits to use to represent the process
		identifier (PID).
- altr,tlb-num-ways: Specifies the number of set-associativity ways in the TLB.
- altr,tlb-num-entries: Specifies the number of entries in the TLB.
- altr,tlb-ptr-sz: Specifies size of TLB pointer.
- altr,has-mul: Specifies CPU hardware multipy support, should be 1.
- altr,has-mmu: Specifies CPU support MMU support, should be 1.
- altr,has-initda: Specifies CPU support initda instruction, should be 1.
- altr,reset-addr: Specifies CPU reset address
- altr,fast-tlb-miss-addr: Specifies CPU fast TLB miss exception address
- altr,exception-addr: Specifies CPU exception address

Optional properties:
- altr,has-div: Specifies CPU hardware divide support
- altr,implementation: Nios II core implementation, this should be "fast";

Example:

cpu@0 {
	device_type = "cpu";
	compatible = "altr,nios2-1.0";
	reg = <0>;
	interrupt-controller;
	#interrupt-cells = <1>;
	clock-frequency = <125000000>;
	dcache-line-size = <32>;
	icache-line-size = <32>;
	dcache-size = <32768>;
	icache-size = <32768>;
	altr,implementation = "fast";
	altr,pid-num-bits = <8>;
	altr,tlb-num-ways = <16>;
	altr,tlb-num-entries = <128>;
	altr,tlb-ptr-sz = <7>;
	altr,has-div = <1>;
	altr,has-mul = <1>;
	altr,reset-addr = <0xc2800000>;
	altr,fast-tlb-miss-addr = <0xc7fff400>;
	altr,exception-addr = <0xd0000020>;
	altr,has-initda = <1>;
	altr,has-mmu = <1>;
};