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ASoC: davinci-mcbsp: add binding for McBSP

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Add devicetree binding for the TI DA850/OMAP-L138/AM18xx
MultiChannel Buffered Serial Port (McBSP)

The optional register range "dat" is not implemented at the moment.
The current driver supports only DMA into RX/TX registers but no FIFO.
Once the FIFO is implemented in the driver the "dat" range will be used.

Signed-off-by: Petr Kulhavy <petr@barix.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Petr Kulhavy 2016-04-18 14:32:40 +02:00 committed by Mark Brown
parent f55532a0c0
commit 22225835e2
1 changed files with 51 additions and 0 deletions
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Documentation/devicetree/bindings/sound/davinci-mcbsp.txt Normal file
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Texas Instruments DaVinci McBSP module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This binding describes the "Multi-channel Buffered Serial Port" (McBSP)
audio interface found in some TI DaVinci processors like the OMAP-L138 or AM180x.
Required properties:
~~~~~~~~~~~~~~~~~~~~
- compatible :
"ti,da850-mcbsp" : for DA850, AM180x and OPAM-L138 platforms
- reg : physical base address and length of the controller memory mapped
region(s).
- reg-names : Should contain:
* "mpu" for the main registers (required).
* "dat" for the data FIFO (optional).
- dmas: three element list of DMA controller phandles, DMA request line and
TC channel ordered triplets.
- dma-names: identifier string for each DMA request line in the dmas property.
These strings correspond 1:1 with the ordered pairs in dmas. The dma
identifiers must be "rx" and "tx".
Optional properties:
~~~~~~~~~~~~~~~~~~~~
- interrupts : Interrupt numbers for McBSP
- interrupt-names : Known interrupt names are "rx" and "tx"
- pinctrl-0: Should specify pin control group used for this controller.
- pinctrl-names: Should contain only one value - "default", for more details
please refer to pinctrl-bindings.txt
Example (AM1808):
~~~~~~~~~~~~~~~~~
mcbsp0: mcbsp@1d10000 {
compatible = "ti,da850-mcbsp";
pinctrl-names = "default";
pinctrl-0 = <&mcbsp0_pins>;
reg = <0x00110000 0x1000>,
<0x00310000 0x1000>;
reg-names = "mpu", "dat";
interrupts = <97 98>;
interrupts-names = "rx", "tx";
dmas = <&edma0 3 1
&edma0 2 1>;
dma-names = "tx", "rx";
status = "okay";
};