Configurating sound card for I2S on custom board

Autonomous Machines Jetson & Embedded Systems Jetson AGX Orin
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1

Hi,

I’m back with another question about setupping my i2s lanes on my custom CVB. I have 4 i2s port connected to i2s1, i2s2, i2s3 and i2s6 (gpio pins) on module. I need to be alble to configure correctly those with different parameter like the offset of tdm interface.

However, right now when listing all alsa devices for recording (arecord -l) I get none. I did not modify dtb for now because I want to understand how to do it properly. I read the entries inside the developpement guide but it is not clear what to change inside the dtb (Audio Setup and Development — Jetson Linux Developer Guide documentation). Could you guide through configuring the i2s ports please?

From kernel sources dtb i have this :
tegra234-p3737-audio.dtsi (8.3 KB)

Thanks

3

There is another similar topic posted from you, is this still an issue to support or we only need to have suggestions at the new one?

Thanks

4

It’s about the same goal (making my i2s ports function properly) but the other topic seems to be more precise. I feel the other question should be answered first but it’s more about what you feel is easier to accomplish first.

Thanks for your reply!

Loic

6

Hi, I’m reopening this topic since I was able to get the error specified inside the online guide about source/sink widgets not being found (Audio Setup and Development — Jetson Linux Developer Guide documentation).
[For reference here is the sudo dmesg | grep asoc command output]

[ 15.936754] tegra-asoc: sound: Adding to iommu group 56
[ 16.323817] tegra-asoc: sound: ASoC: no source widget found for CVB-RT HPOL
[ 16.331703] tegra-asoc: sound: ASoC: Failed to add route CVB-RT HPOL → direct → CVB-RT Headphone Jack
[ 16.331733] tegra-asoc: sound: ASoC: no source widget found for CVB-RT HPOR
[ 16.350012] tegra-asoc: sound: ASoC: Failed to add route CVB-RT HPOR → direct → CVB-RT Headphone Jack
[ 16.350037] tegra-asoc: sound: ASoC: no sink widget found for CVB-RT IN1P
[ 16.368159] tegra-asoc: sound: ASoC: Failed to add route CVB-RT Mic Jack → direct → CVB-RT IN1P
[ 16.368183] tegra-asoc: sound: ASoC: no sink widget found for CVB-RT IN2P
[ 16.385823] tegra-asoc: sound: ASoC: Failed to add route CVB-RT Mic Jack → direct → CVB-RT IN2P
[ 16.385850] tegra-asoc: sound: ASoC: no source widget found for CVB-RT SPOLP
[ 16.403767] tegra-asoc: sound: ASoC: Failed to add route CVB-RT SPOLP → direct → CVB-RT Int Spk
[ 16.403793] tegra-asoc: sound: ASoC: no source widget found for CVB-RT SPORP
[ 16.421592] tegra-asoc: sound: ASoC: Failed to add route CVB-RT SPORP → direct → CVB-RT Int Spk
[ 16.421626] tegra-asoc: sound: ASoC: no sink widget found for CVB-RT DMIC1
[ 16.421627] tegra-asoc: sound: ASoC: Failed to add route CVB-RT Int Mic → direct → CVB-RT DMIC1
[ 16.421651] tegra-asoc: sound: ASoC: no sink widget found for CVB-RT DMIC2
[ 16.421653] tegra-asoc: sound: ASoC: Failed to add route CVB-RT Int Mic → direct → CVB-RT DMIC2
[ 16.428501] tegra-asoc: sound: snd_soc_register_card failed (-19)

So now, I think I need to configure properly the device tree by adding the i2s DAIs to it. Is there a device tree from one of your other jetson models that would be similar to my setup (custom board for devkit orin agx module with 4 i2s ports directly connected to the SoC) ?

Thank you!

Loic Boileau