ARM: dts: clps711x: Add bindings documentation for CLPS711X irqchip driver

Cirrus Logic CLPS711X Interrupt Controller

Required properties:

- compatible: Should be "cirrus,clps711x-intc".

- reg: Specifies base physical address of the registers set.

- interrupt-controller: Identifies the node as an interrupt controller.

- #interrupt-cells: Specifies the number of cells needed to encode an

  interrupt source. The value shall be 1.

The interrupt sources are as follows:

ID	Name	Description

---------------------------

1:	BLINT	Battery low (FIQ)

3:	MCINT	Media changed (FIQ)

4:	CSINT	CODEC sound

5:	EINT1	External 1

6:	EINT2	External 2

7:	EINT3	External 3

8:	TC1OI	TC1 under flow

9:	TC2OI	TC2 under flow

10:	RTCMI	RTC compare match

11:	TINT	64Hz tick

12:	UTXINT1	UART1 transmit FIFO half empty

13:	URXINT1	UART1 receive FIFO half full

14:	UMSINT	UART1 modem status changed

15:	SSEOTI	SSI1 end of transfer

16:	KBDINT	Keyboard

17:	SS2RX	SSI2 receive FIFO half or greater full

18:	SS2TX	SSI2 transmit FIFO less than half empty

28:	UTXINT2	UART2 transmit FIFO half empty

29:	URXINT2	UART2 receive FIFO half full

32:	DAIINT	DAI interface (FIQ)

Example:

	intc: interrupt-controller {

		compatible = "cirrus,clps711x-intc";

		reg = <0x80000000 0x4000>;

		interrupt-controller;

		#interrupt-cells = <1>;

	};