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