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 "fsl,imx8qm-esai", 16 17 - reg : Offset and length of the register set for the device. 18 19 - interrupts : Contains the spdif interrupt. 20 21 - dmas : Generic dma devicetree binding as described in 22 Documentation/devicetree/bindings/dma/dma.txt. 23 24 - dma-names : Two dmas have to be defined, "tx" and "rx". 25 26 - clocks : Contains an entry for each entry in clock-names. 27 28 - clock-names : Includes the following entries: 29 "core" The core clock used to access registers 30 "extal" The esai baud clock for esai controller used to 31 derive HCK, SCK and FS. 32 "fsys" The system clock derived from ahb clock used to 33 derive HCK, SCK and FS. 34 "spba" The spba clock is required when ESAI is placed as a 35 bus slave of the Shared Peripheral Bus and when two 36 or more bus masters (CPU, DMA or DSP) try to access 37 it. This property is optional depending on the SoC 38 design. 39 40 - fsl,fifo-depth : The number of elements in the transmit and receive 41 FIFOs. This number is the maximum allowed value for 42 TFCR[TFWM] or RFCR[RFWM]. 43 44 - fsl,esai-synchronous: This is a boolean property. If present, indicating 45 that ESAI would work in the synchronous mode, which 46 means all the settings for Receiving would be 47 duplicated from Transmition related registers. 48 49Optional properties: 50 51 - big-endian : If this property is absent, the native endian mode 52 will be in use as default, or the big endian mode 53 will be in use for all the device registers. 54 55Example: 56 57esai: esai@2024000 { 58 compatible = "fsl,imx35-esai"; 59 reg = <0x02024000 0x4000>; 60 interrupts = <0 51 0x04>; 61 clocks = <&clks 208>, <&clks 118>, <&clks 208>; 62 clock-names = "core", "extal", "fsys"; 63 dmas = <&sdma 23 21 0>, <&sdma 24 21 0>; 64 dma-names = "rx", "tx"; 65 fsl,fifo-depth = <128>; 66 fsl,esai-synchronous; 67 big-endian; 68}; 69