1Freescale Enhanced Serial Audio Interface (ESAI) Controller
2
3The Enhanced Serial Audio Interface (ESAI) provides a full-duplex serial port
4for serial communication with a variety of serial devices, including industry
5standard codecs, Sony/Phillips Digital Interface (S/PDIF) transceivers, and
6other DSPs. It has up to six transmitters and four receivers.
7
8Required properties:
9
10  - compatible		: Compatible list, should contain one of the following
11			  compatibles:
12			  "fsl,imx35-esai",
13			  "fsl,vf610-esai",
14			  "fsl,imx6ull-esai",
15
16  - reg			: Offset and length of the register set for the device.
17
18  - interrupts		: Contains the spdif interrupt.
19
20  - dmas		: Generic dma devicetree binding as described in
21			  Documentation/devicetree/bindings/dma/dma.txt.
22
23  - dma-names		: Two dmas have to be defined, "tx" and "rx".
24
25  - clocks		: Contains an entry for each entry in clock-names.
26
27  - clock-names		: Includes the following entries:
28	"core"		  The core clock used to access registers
29	"extal"		  The esai baud clock for esai controller used to
30			  derive HCK, SCK and FS.
31	"fsys"		  The system clock derived from ahb clock used to
32			  derive HCK, SCK and FS.
33	"spba"		  The spba clock is required when ESAI is placed as a
34			  bus slave of the Shared Peripheral Bus and when two
35			  or more bus masters (CPU, DMA or DSP) try to access
36			  it. This property is optional depending on the SoC
37			  design.
38
39  - fsl,fifo-depth	: The number of elements in the transmit and receive
40			  FIFOs. This number is the maximum allowed value for
41			  TFCR[TFWM] or RFCR[RFWM].
42
43  - fsl,esai-synchronous: This is a boolean property. If present, indicating
44			  that ESAI would work in the synchronous mode, which
45			  means all the settings for Receiving would be
46			  duplicated from Transmition related registers.
47
48Optional properties:
49
50  - big-endian		: If this property is absent, the native endian mode
51			  will be in use as default, or the big endian mode
52			  will be in use for all the device registers.
53
54Example:
55
56esai: esai@2024000 {
57	compatible = "fsl,imx35-esai";
58	reg = <0x02024000 0x4000>;
59	interrupts = <0 51 0x04>;
60	clocks = <&clks 208>, <&clks 118>, <&clks 208>;
61	clock-names = "core", "extal", "fsys";
62	dmas = <&sdma 23 21 0>, <&sdma 24 21 0>;
63	dma-names = "rx", "tx";
64	fsl,fifo-depth = <128>;
65	fsl,esai-synchronous;
66	big-endian;
67};
68