From: Kenneth Westfield kwestfie@codeaurora.org
This set of patches adds support for audio on the Qualcomm Technologies ipq806x SOC.
The ipq806x SOC has audio-related hardware blocks in its low-power audio subsystem (or LPASS). One of the relevant blocks in the LPASS is its low-power audio interface (or LPAIF). This encapsulates the MI2S port, which is what these drivers are configured to use. The I2S pins are connected to an external DAC/amp chip. In addition, a single GPIO is connected to the same DAC/amp, which gives the SOC enable/disable control.
The specific drivers added are: - a Codec DAI driver that controls the SOC external pins - a CPU DAI driver for controlling the LPASS-LPAIF block - a PCM MI2S platform driver
These drivers, together, are used by simple-audio-card to complete the audio implementation. Corresponding additions to the device tree for the ipq806x and its documentation has also been added. Also, as this is a new directory, the MAINTAINERS file has been updated as well.
== Updates from my previous post:
[Patch v2 00/11] ASoC: QCOM: Add support for ipq806x SOC http://thread.gmane.org/gmane.linux.ports.arm.msm/10989
- Removed the PCM platform driver from the DTS platform and tied it to the CPU DAI driver. - Changed I2S pinctrl to use generic naming convention and moved control to CPU DAI driver. It should be controlled now by soc-core's pinctrl_pm_* functionality. - Added stub DAPM support in codec driver. As the DAC GPIO needs to be enabled last when starting playback, and disabled first when stopping playback, it seems as though the trigger function may be the place for this. Suggestions are welcome for a better place to put this. - Removed machine driver and tied DAI drivers to simple-audio-card. - Packaged the build files and Maxim codec files together in one change. - Removed QCOM as vendor from Maxim code and documentation. - Separated the SOC and board definitions into the correct DTS files. - Update device tree documentation to reflect changes. - General code cleanup.
== Additional patch series upon which this patch series has device-tree dependencies (lcc)
[PATCH v2 0/8] qcom audio clock control drivers http://thread.gmane.org/gmane.linux.ports.arm.msm/10793
Kenneth Westfield (10): MAINTAINERS: Add QCOM audio ASoC maintainer ASoC: qcom: Document MAX98357A bindings ASoC: qcom: Document LPASS CPU bindings ASoC: codec: Add MAX98357A codec driver ASoC: ipq806x: add LPASS header files ASoC: ipq806x: Add LPASS CPU DAI driver ASoC: ipq806x: Add I2S PCM platform driver ASoC: qcom: Add ability to build QCOM drivers ASoC: Allow for building QCOM drivers ARM: dts: Model IPQ LPASS audio hardware
.../devicetree/bindings/sound/max98357a.txt | 14 + .../bindings/sound/qcom,lpass-cpu-mi2s.txt | 42 ++ MAINTAINERS | 7 + arch/arm/boot/dts/qcom-ipq8064.dtsi | 23 + sound/soc/Kconfig | 1 + sound/soc/Makefile | 1 + sound/soc/codecs/Kconfig | 4 + sound/soc/codecs/Makefile | 2 + sound/soc/codecs/max98357a.c | 136 ++++++ sound/soc/qcom/Kconfig | 27 ++ sound/soc/qcom/Makefile | 6 + sound/soc/qcom/lpass-cpu-mi2s.c | 378 ++++++++++++++++ sound/soc/qcom/lpass-lpaif-reg.h | 155 +++++++ sound/soc/qcom/lpass-mi2s.h | 34 ++ sound/soc/qcom/lpass-pcm-mi2s.c | 486 +++++++++++++++++++++ 15 files changed, 1316 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/max98357a.txt create mode 100644 Documentation/devicetree/bindings/sound/qcom,lpass-cpu-mi2s.txt create mode 100644 sound/soc/codecs/max98357a.c create mode 100644 sound/soc/qcom/Kconfig create mode 100644 sound/soc/qcom/Makefile create mode 100644 sound/soc/qcom/lpass-cpu-mi2s.c create mode 100644 sound/soc/qcom/lpass-lpaif-reg.h create mode 100644 sound/soc/qcom/lpass-mi2s.h create mode 100644 sound/soc/qcom/lpass-pcm-mi2s.c