ASOC machine driver example to iMX8MM or any iMX family processors

[sreedhar_appala]

Hi,

I am working with iMX8MM EVK and Yocto distribution 4.19.35 version

Build Configuration:
BB_VERSION = "1.42.0"
BUILD_SYS = "x86_64-linux"
NATIVELSBSTRING = "ubuntu-16.04"
TARGET_SYS = "aarch64-poky-linux"
MACHINE = "imx8mmevk"
DISTRO = "fsl-imx-xwayland"
DISTRO_VERSION = "4.19-warrior"
TUNE_FEATURES = "aarch64"
TARGET_FPU = ""

we have interfaced another SoC to iMX8MM EVK using i2c interface. this SoC contains a voice audio codec.

we have developed a ASOC machine driver for this scenario, i am evaluating the same and having some issues.

I feel it is better to have a look at any reference machine driver for this kind will help me in solving the issues i am facing.

I would like to look at any reference of similar kind of audio codec which is part of SoC and interfaced to iMX8MM or any iMX family of processors through any interface will help my purpose.

could you please point me to any of such kind in kernel.

Thank you,

Sreedhar

[igorpadykov]

Hi Sreedhar

one can look at description in Chapter 7 Audio sect.7.1 Advanced Linux Sound

Architecture (ALSA) System on a Chip (ASoC) Sound in  i.MX Linux Reference Manual

and all linux documentation on

Embedded Linux for i.MX Applications Processors | NXP 

Best regards
igor
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[sreedhar_appala]

Hi igor,

Thank you for the quick reply. I knew and read this documentation.

Our interface is iMX8MM  SAI (I2S)  <====> Another SoC(I2S) interface, It is a Voice based Processing Chip.

There is no codec here. Does NXP platforms of any has such interface and possibly drivers for these, that can help me as a reference.

Thank you once again,

Sreedhar

[igorpadykov · Accepted solution]

Hi Sreedhar

for such case one can consider simple-audio-card:

SAI on i.MX8M Mini 

Best regards
igor

[sreedhar_appala]

Thank you igor,

I will check the simple audio card, I found a driver imx-dsp.c (Machine driver for Tensilica DSP)

sound/soc/fsl/imx-dsp.c

I will check both, that should help me.

Thanks once again,

Sreedhar