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Commit 43d24e76 authored by Nicolin Chen's avatar Nicolin Chen Committed by Mark Brown
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ASoC: fsl_esai: Add ESAI CPU DAI driver 



This patch implements a device-tree-only CPU DAI driver for Freescale ESAI
controller that supports:

 - 12 channels playback and 8 channels record.
   [ Some of the inner transmitters and receivers are sharing same group of
     pins. So the maxmium 12 output or 8 input channels are only valid if
     there is no pin conflict occurring to it. ]

 - Independent (asynchronous mode) or shared (synchronous mode) transmit and
   receive sections with separate or shared internal/external clocks and frame
   syncs, operating in Master or Slave mode.
   [ Current ALSA seems not to allow CPU DAI drivers to configure DAI format
     separately for PLAYBACK and CAPTURE. So this first version only supports
     the case that uses the same DAI format for both directions. ]

 - Various DAI formats: I2S, Left-Justified, Right-Justified, DSP-A and DSP-B.

 - Programmable word length (8, 16, 20 or 24bits)

 - Flexible selection between system clock or external oscillator as input
   clock source, programmable internal clock divider and frame sync generation.

Signed-off-by: default avatarNicolin Chen <Guangyu.Chen@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 633ff8f8

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

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Freescale Enhanced Serial Audio Interface (ESAI) Controller



The Enhanced Serial Audio Interface (ESAI) provides a full-duplex serial port

for serial communication with a variety of serial devices, including industry

standard codecs, Sony/Phillips Digital Interface (S/PDIF) transceivers, and

other DSPs. It has up to six transmitters and four receivers.



Required properties:



  - compatible : Compatible list, must contain "fsl,imx35-esai".



  - 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 : Two dmas have to be defined, "tx" and "rx".



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



  - clock-names : Includes the following entries:

	"core"		The core clock used to access registers

	"extal"		The esai baud clock for esai controller used to derive

			HCK, SCK and FS.

	"fsys"		The system clock derived from ahb clock used to derive

			HCK, SCK and FS.



  - fsl,fifo-depth: The number of elements in the transmit and receive FIFOs.

    This number is the maximum allowed value for TFCR[TFWM] or RFCR[RFWM].



  - fsl,esai-synchronous: This is a boolean property. If present, indicating

    that ESAI would work in the synchronous mode, which means all the settings

    for Receiving would be duplicated from Transmition related registers.



Example:



esai: esai@02024000 {

	compatible = "fsl,imx35-esai";

	reg = <0x02024000 0x4000>;

	interrupts = <0 51 0x04>;

	clocks = <&clks 208>, <&clks 118>, <&clks 208>;

	clock-names = "core", "extal", "fsys";

	dmas = <&sdma 23 21 0>, <&sdma 24 21 0>;

	dma-names = "rx", "tx";

	fsl,fifo-depth = <128>;

	fsl,esai-synchronous;

	status = "disabled";

};

sound/soc/fsl/Kconfig

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@@ -8,6 +8,9 @@ config SND_SOC_FSL_SSI 
config SND_SOC_FSL_SPDIF

	tristate



config SND_SOC_FSL_ESAI

	tristate



config SND_SOC_FSL_UTILS

	tristate

sound/soc/fsl/Makefile

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@@ -14,11 +14,13 @@ obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o 
snd-soc-fsl-sai-objs := fsl_sai.o

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

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_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

obj-$(CONFIG_SND_SOC_FSL_ESAI) += snd-soc-fsl-esai.o

obj-$(CONFIG_SND_SOC_FSL_UTILS) += snd-soc-fsl-utils.o

obj-$(CONFIG_SND_SOC_POWERPC_DMA) += snd-soc-fsl-dma.o

sound/soc/fsl/fsl_esai.c

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sound/soc/fsl/fsl_esai.h

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