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Commit 3117bb31 authored by Nicolin Chen's avatar Nicolin Chen Committed by Mark Brown
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ASoC: fsl_asrc: Add ASRC ASoC CPU DAI and platform drivers 



The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a
signal associated with an input clock into a signal associated with a different
output clock. The driver currently works as a Front End of DPCM with other Back
Ends DAI links such as ESAI<->CS42888 and SSI<->WM8962 and SAI. It converts the
original sample rate to a common rate supported by Back Ends for playback while
converts the common rate of Back Ends to a desired rate for capture. It has 3
pairs to support three different substreams within totally 10 channels.

Signed-off-by: default avatarNicolin Chen <nicoleotsuka@gmail.com>
Reviewed-by: default avatarVarka Bhadram <varkabhadram@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 94b912e4

Documentation/devicetree/bindings/sound/fsl,asrc.txt

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Freescale Asynchronous Sample Rate Converter (ASRC) Controller



The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a

signal associated with an input clock into a signal associated with a different

output clock. The driver currently works as a Front End of DPCM with other Back

Ends Audio controller such as ESAI, SSI and SAI. It has three pairs to support

three substreams within totally 10 channels.



Required properties:



  - compatible		: Contains "fsl,imx35-asrc" or "fsl,imx53-asrc".



  - reg			: Offset and length of the register set for the device.



  - interrupts		: Contains the spdif interrupt.



  - dmas		: Generic dma devicetree binding as described in

			  Documentation/devicetree/bindings/dma/dma.txt.



  - dma-names		: Contains "rxa", "rxb", "rxc", "txa", "txb" and "txc".



  - clocks		: Contains an entry for each entry in clock-names.



  - clock-names		: Contains the following entries

	"mem"		  Peripheral access clock to access registers.

	"ipg"		  Peripheral clock to driver module.

	"asrck_<0-f>"	  Clock sources for input and output clock.



   - big-endian		: If this property is absent, the little endian mode

			  will be in use as default. Otherwise, the big endian

			  mode will be in use for all the device registers.



   - fsl,asrc-rate	: Defines a mutual sample rate used by DPCM Back Ends.



   - fsl,asrc-width	: Defines a mutual sample width used by DPCM Back Ends.



Example:



asrc: asrc@02034000 {

	compatible = "fsl,imx53-asrc";

	reg = <0x02034000 0x4000>;

	interrupts = <0 50 IRQ_TYPE_LEVEL_HIGH>;

	clocks = <&clks 107>, <&clks 107>, <&clks 0>,

	       <&clks 0>, <&clks 0>, <&clks 0>, <&clks 0>,

	       <&clks 0>, <&clks 0>, <&clks 0>, <&clks 0>,

	       <&clks 0>, <&clks 0>, <&clks 0>, <&clks 0>,

	       <&clks 107>, <&clks 0>, <&clks 0>;

	clock-names = "mem", "ipg", "asrck0",

		"asrck_1", "asrck_2", "asrck_3", "asrck_4",

		"asrck_5", "asrck_6", "asrck_7", "asrck_8",

		"asrck_9", "asrck_a", "asrck_b", "asrck_c",

		"asrck_d", "asrck_e", "asrck_f";

	dmas = <&sdma 17 23 1>, <&sdma 18 23 1>, <&sdma 19 23 1>,

	     <&sdma 20 23 1>, <&sdma 21 23 1>, <&sdma 22 23 1>;

	dma-names = "rxa", "rxb", "rxc",

		"txa", "txb", "txc";

	fsl,asrc-rate  = <48000>;

	fsl,asrc-width = <16>;

	status = "okay";

};

sound/soc/fsl/Kconfig

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@@ -2,6 +2,15 @@ menu "SoC Audio for Freescale CPUs" 


comment "Common SoC Audio options for Freescale CPUs:"



config SND_SOC_FSL_ASRC

	tristate "Asynchronous Sample Rate Converter (ASRC) module support"

	select REGMAP_MMIO

	help

	  Say Y if you want to add Asynchronous Sample Rate Converter (ASRC)

	  support for the Freescale CPUs.

	  This option is only useful for out-of-tree drivers since

	  in-tree drivers select it automatically.



config SND_SOC_FSL_SAI

	tristate "Synchronous Audio Interface (SAI) module support"

	select REGMAP_MMIO

sound/soc/fsl/Makefile

+2 −0
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@@ -11,6 +11,7 @@ snd-soc-p1022-rdk-objs := p1022_rdk.o 
obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o



# Freescale SSI/DMA/SAI/SPDIF Support

snd-soc-fsl-asrc-objs := fsl_asrc.o fsl_asrc_dma.o

snd-soc-fsl-sai-objs := fsl_sai.o

snd-soc-fsl-ssi-y := fsl_ssi.o

snd-soc-fsl-ssi-$(CONFIG_DEBUG_FS) += fsl_ssi_dbg.o
@@ -18,6 +19,7 @@ snd-soc-fsl-spdif-objs := fsl_spdif.o 
snd-soc-fsl-esai-objs := fsl_esai.o

snd-soc-fsl-utils-objs := fsl_utils.o

snd-soc-fsl-dma-objs := fsl_dma.o

obj-$(CONFIG_SND_SOC_FSL_ASRC) += snd-soc-fsl-asrc.o

obj-$(CONFIG_SND_SOC_FSL_SAI) += snd-soc-fsl-sai.o

obj-$(CONFIG_SND_SOC_FSL_SSI) += snd-soc-fsl-ssi.o

obj-$(CONFIG_SND_SOC_FSL_SPDIF) += snd-soc-fsl-spdif.o