87 lines
3.1 KiB
Plaintext
87 lines
3.1 KiB
Plaintext
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Texas Instruments McASP controller
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Required properties:
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- compatible :
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"ti,dm646x-mcasp-audio" : for DM646x platforms
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"ti,da830-mcasp-audio" : for both DA830 & DA850 platforms
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"ti,am33xx-mcasp-audio" : for AM33xx platforms (AM33xx, AM43xx, TI81xx)
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"ti,dra7-mcasp-audio" : for DRA7xx platforms
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"ti,omap4-mcasp-audio" : for OMAP4
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- reg : Should contain reg specifiers for the entries in the reg-names property.
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- reg-names : Should contain:
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* "mpu" for the main registers (required). For compatibility with
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existing software, it is recommended this is the first entry.
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* "dat" for separate data port register access (optional).
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- op-mode : I2S/DIT ops mode. 0 for I2S mode. 1 for DIT mode used for S/PDIF,
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IEC60958-1, and AES-3 formats.
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- tdm-slots : Slots for TDM operation. Indicates number of channels transmitted
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or received over one serializer.
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- serial-dir : A list of serializer configuration. Each entry is a number
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indication for serializer pin direction.
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(0 - INACTIVE, 1 - TX, 2 - RX)
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- dmas: two element list of DMA controller phandles and DMA request line
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ordered pairs.
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- dma-names: identifier string for each DMA request line in the dmas property.
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These strings correspond 1:1 with the ordered pairs in dmas. The dma
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identifiers must be "rx" and "tx".
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Optional properties:
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- ti,hwmods : Must be "mcasp<n>", n is controller instance starting 0
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- tx-num-evt : FIFO levels.
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- rx-num-evt : FIFO levels.
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- dismod : Specify the drive on TX pin during inactive slots
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0 : 3-state
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2 : logic low
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3 : logic high
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Defaults to 'logic low' when the property is not present
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- sram-size-playback : size of sram to be allocated during playback
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- sram-size-capture : size of sram to be allocated during capture
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- interrupts : Interrupt numbers for McASP
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- interrupt-names : Known interrupt names are "tx" and "rx"
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- pinctrl-0: Should specify pin control group used for this controller.
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- pinctrl-names: Should contain only one value - "default", for more details
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please refer to pinctrl-bindings.txt
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- fck_parent : Should contain a valid clock name which will be used as parent
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for the McASP fck
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- auxclk-fs-ratio: When McASP is bus master indicates the ratio between AUCLK
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and FS rate if applicable:
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AUCLK rate = auxclk-fs-ratio * FS rate
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Optional GPIO support:
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If any McASP pin need to be used as GPIO then the McASP node must have:
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...
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gpio-controller
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#gpio-cells = <2>;
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...
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When requesting a GPIO, the first parameter is the PIN index in McASP_P*
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registers.
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For example to request the AXR2 pin of mcasp8:
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function-gpios = <&mcasp8 2 0>;
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Or to request the ACLKR pin of mcasp8:
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function-gpios = <&mcasp8 29 0>;
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For generic gpio information, please refer to bindings/gpio/gpio.txt
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Example:
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mcasp0: mcasp0@1d00000 {
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compatible = "ti,da830-mcasp-audio";
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reg = <0x100000 0x3000>;
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reg-names "mpu";
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interrupts = <82>, <83>;
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interrupt-names = "tx", "rx";
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op-mode = <0>; /* MCASP_IIS_MODE */
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tdm-slots = <2>;
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serial-dir = <
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0 0 0 0 /* 0: INACTIVE, 1: TX, 2: RX */
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0 0 0 0
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0 0 0 1
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2 0 0 0 >;
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tx-num-evt = <1>;
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rx-num-evt = <1>;
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};
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