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@xxxxxxx> > --- > .../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>; > + }; > +
