On Tue, Dec 18, 2018 at 04:30:01PM +0000, Viorel Suman wrote:
This patch implements Audio Mixer CPU DAI driver for NXP iMX8 SOCs. The Audio Mixer is a on-chip functional module that allows mixing of two audio streams into a single audio stream.
Audio Mixer datasheet is available here: https://www.nxp.com/docs/en/reference-manual/IMX8DQXPRM.pdf
Signed-off-by: Viorel Suman viorel.suman@nxp.com
.../devicetree/bindings/sound/fsl,amix.txt | 45 ++
This should be a separate patch.
sound/soc/fsl/Kconfig | 7 + sound/soc/fsl/Makefile | 3 + sound/soc/fsl/fsl_amix.c | 554 +++++++++++++++++++++ sound/soc/fsl/fsl_amix.h | 101 ++++ 5 files changed, 710 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/fsl,amix.txt create mode 100644 sound/soc/fsl/fsl_amix.c create mode 100644 sound/soc/fsl/fsl_amix.h
diff --git a/Documentation/devicetree/bindings/sound/fsl,amix.txt b/Documentation/devicetree/bindings/sound/fsl,amix.txt new file mode 100644 index 0000000..049144f --- /dev/null +++ b/Documentation/devicetree/bindings/sound/fsl,amix.txt @@ -0,0 +1,45 @@ +NXP Audio Mixer (AMIX).
+The Audio Mixer is a on-chip functional module that allows mixing of two +audio streams into a single audio stream. Audio Mixer has two input serial +audio interfaces. These are driven by two Synchronous Audio interface +modules (SAI). Each input serial interface carries 8 audio channels in its +frame in TDM manner. Mixer mixes audio samples of corresponding channels +from two interfaces into a single sample. Before mixing, audio samples of +two inputs can be attenuated based on configuration. The output of the +Audio Mixer is also a serial audio interface. Like input interfaces it has +the same TDM frame format. This output is used to drive the serial DAC TDM +interface of audio codec and also sent to the external pins along with the +receive path of normal audio SAI module for readback by the CPU.
+The output of Audio mixer can be selected from any of the three streams
- serial audio input 1
- serial audio input 2
- Mixed audio
+Mixing operation is independent of audio sample rate but the two audio +input streams must have same audio sample rate with same number of channels +in TDM frame to be eligible for mixing.
+Device driver required properties: +=================================
- compatible : Compatible list, contains "fsl,imx8qm-amix"
- reg : Offset and length of the register set for the device.
- clocks : Must contain an entry for each entry in clock-names.
- clock-names : Must include the "ipg" for register access.
Humm, no audio related clocks?
- power-domains : Must contain the phandle to the AMIX power domain node
+Device driver configuration example: +======================================
- amix: amix@59840000 {
- compatible = "fsl,imx8qm-amix";
- reg = <0x0 0x59840000 0x0 0x10000>;
- clocks = <&clk IMX8QXP_AUD_AMIX_IPG>;
- clock-names = "ipg";
- power-domains = <&pd_amix>;
- };