1Texas Instruments McASP controller 2 3Required properties: 4- compatible : 5 "ti,dm646x-mcasp-audio" : for DM646x platforms 6 "ti,da830-mcasp-audio" : for both DA830 & DA850 platforms 7 "ti,am33xx-mcasp-audio" : for AM33xx platforms (AM33xx, AM43xx, TI81xx) 8 "ti,dra7-mcasp-audio" : for DRA7xx platforms 9 "ti,omap4-mcasp-audio" : for OMAP4 10 11- reg : Should contain reg specifiers for the entries in the reg-names property. 12- reg-names : Should contain: 13 * "mpu" for the main registers (required). For compatibility with 14 existing software, it is recommended this is the first entry. 15 * "dat" for separate data port register access (optional). 16- op-mode : I2S/DIT ops mode. 0 for I2S mode. 1 for DIT mode used for S/PDIF, 17 IEC60958-1, and AES-3 formats. 18- tdm-slots : Slots for TDM operation. Indicates number of channels transmitted 19 or received over one serializer. 20- serial-dir : A list of serializer configuration. Each entry is a number 21 indication for serializer pin direction. 22 (0 - INACTIVE, 1 - TX, 2 - RX) 23- dmas: two element list of DMA controller phandles and DMA request line 24 ordered pairs. 25- dma-names: identifier string for each DMA request line in the dmas property. 26 These strings correspond 1:1 with the ordered pairs in dmas. The dma 27 identifiers must be "rx" and "tx". 28 29Optional properties: 30 31- ti,hwmods : Must be "mcasp<n>", n is controller instance starting 0 32- tx-num-evt : FIFO levels. 33- rx-num-evt : FIFO levels. 34- dismod : Specify the drive on TX pin during inactive slots 35 0 : 3-state 36 2 : logic low 37 3 : logic high 38 Defaults to 'logic low' when the property is not present 39- sram-size-playback : size of sram to be allocated during playback 40- sram-size-capture : size of sram to be allocated during capture 41- interrupts : Interrupt numbers for McASP 42- interrupt-names : Known interrupt names are "tx" and "rx" 43- pinctrl-0: Should specify pin control group used for this controller. 44- pinctrl-names: Should contain only one value - "default", for more details 45 please refer to pinctrl-bindings.txt 46- fck_parent : Should contain a valid clock name which will be used as parent 47 for the McASP fck 48- auxclk-fs-ratio: When McASP is bus master indicates the ratio between AUCLK 49 and FS rate if applicable: 50 AUCLK rate = auxclk-fs-ratio * FS rate 51 52Optional GPIO support: 53If any McASP pin need to be used as GPIO then the McASP node must have: 54... 55 gpio-controller 56 #gpio-cells = <2>; 57... 58 59When requesting a GPIO, the first parameter is the PIN index in McASP_P* 60registers. 61For example to request the AXR2 pin of mcasp8: 62function-gpios = <&mcasp8 2 0>; 63 64Or to request the ACLKR pin of mcasp8: 65function-gpios = <&mcasp8 29 0>; 66 67For generic gpio information, please refer to bindings/gpio/gpio.txt 68 69Example: 70 71mcasp0: mcasp0@1d00000 { 72 compatible = "ti,da830-mcasp-audio"; 73 reg = <0x100000 0x3000>; 74 reg-names "mpu"; 75 interrupts = <82>, <83>; 76 interrupt-names = "tx", "rx"; 77 op-mode = <0>; /* MCASP_IIS_MODE */ 78 tdm-slots = <2>; 79 serial-dir = < 80 0 0 0 0 /* 0: INACTIVE, 1: TX, 2: RX */ 81 0 0 0 0 82 0 0 0 1 83 2 0 0 0 >; 84 tx-num-evt = <1>; 85 rx-num-evt = <1>; 86}; 87