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Commit c6aeb7de authored by Florian Meier's avatar Florian Meier Committed by Mark Brown
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ASoC: Add support for BCM2835 



This driver adds support for digital audio (I2S)
for the BCM2835 SoC that is used by the
Raspberry Pi. External audio codecs can be
connected to the Raspberry Pi via P5 header.

It relies on cyclic DMA engine support for BCM2835.

Signed-off-by: default avatarFlorian Meier <florian.meier@koalo.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 6ce4eac1

Documentation/devicetree/bindings/sound/bcm2835-i2s.txt

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* Broadcom BCM2835 SoC I2S/PCM module



Required properties:

- compatible: "brcm,bcm2835-i2s"

- reg: A list of base address and size entries:

	* The first entry should cover the PCM registers

	* The second entry should cover the PCM clock registers

- dmas: List of DMA controller phandle and DMA request line ordered pairs.

- dma-names: Identifier string for each DMA request line in the dmas property.

  These strings correspond 1:1 with the ordered pairs in dmas.



  One of the DMA channels will be responsible for transmission (should be

  named "tx") and one for reception (should be named "rx").



Example:



bcm2835_i2s: i2s@7e203000 {

	compatible = "brcm,bcm2835-i2s";

	reg = <0x7e203000 0x20>,

	      <0x7e101098 0x02>;



	dmas = <&dma 2>,

	       <&dma 3>;

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

};

sound/soc/Kconfig

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@@ -33,6 +33,7 @@ config SND_SOC_GENERIC_DMAENGINE_PCM 
# All the supported SoCs

source "sound/soc/atmel/Kconfig"

source "sound/soc/au1x/Kconfig"

source "sound/soc/bcm/Kconfig"

source "sound/soc/blackfin/Kconfig"

source "sound/soc/cirrus/Kconfig"

source "sound/soc/davinci/Kconfig"

sound/soc/Makefile

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@@ -10,6 +10,7 @@ obj-$(CONFIG_SND_SOC) += codecs/ 
obj-$(CONFIG_SND_SOC)	+= generic/

obj-$(CONFIG_SND_SOC)	+= atmel/

obj-$(CONFIG_SND_SOC)	+= au1x/

obj-$(CONFIG_SND_SOC)	+= bcm/

obj-$(CONFIG_SND_SOC)	+= blackfin/

obj-$(CONFIG_SND_SOC)	+= cirrus/

obj-$(CONFIG_SND_SOC)	+= davinci/

sound/soc/bcm/Kconfig

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config SND_BCM2835_SOC_I2S

	tristate "SoC Audio support for the Broadcom BCM2835 I2S module"

	depends on ARCH_BCM2835 || COMPILE_TEST

	select SND_SOC_DMAENGINE_PCM

	select SND_SOC_GENERIC_DMAENGINE_PCM

	select REGMAP_MMIO

	help

	  Say Y or M if you want to add support for codecs attached to

	  the BCM2835 I2S interface. You will also need

	  to select the audio interfaces to support below.

sound/soc/bcm/Makefile

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# BCM2835 Platform Support

snd-soc-bcm2835-i2s-objs := bcm2835-i2s.o



obj-$(CONFIG_SND_BCM2835_SOC_I2S) += snd-soc-bcm2835-i2s.o