i.MX8M Mini, sai5 with multiple data lines

cpetrescu — Mon, 14 Oct 2024 23:45:52 GMT

Hi there,

I'm trying to use sai5 in a multi-line configuration on a custom board with an i.MX8M Mini.

There's an audio link between the i.MX8 and a DSP. The bit clock and the frame clock are generated by an external clock generator.

I can play and record audio (8 channels) as long as I use only one data line (RX_DATA0 and TX_DATA0).

The working device tree fragment is the following:

&sai5 { status = "okay"; fsl,sai-asynchronous; #sound-dai-cells = <1>; }; / { dsp0: fixed_tdm_dummy_codec0 { #sound-dai-cells = <1>; compatible = "test,fixed_tdm"; }; card0: sound { #address-cells = <1>; #size-cells = <0>; status = "okay"; compatible = "simple-audio-card"; simple-audio-card,name = "dsp0"; simple-audio-card,format = "left_j"; simple-audio-card,bitclock-master = <&link0_codec>; simple-audio-card,frame-master = <&link0_codec>; simple-audio-card,dai-link@0 { reg = <0>; format = "left_j"; link0_cpu: cpu { sound-dai = <&sai5 0>; }; link0_codec: codec { sound-dai = <&dsp0 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; frame-master; bitclock-master; }; }; }; };

When I try to add another data line, the simple-card driver fails to load.
asoc_simple_parse_dai returns -EINVAL when it tries to parse the CPU component of the second dai link.
If I try to use only RX_DATA1, TX_DATA1, the simple-card probe fails the same way.

The following two device tree fragments fail:

&sai5 { status = "okay"; fsl,sai-asynchronous; #sound-dai-cells = <1>; fsl,dataline = <8 0x0f 0x0f>; fsl,sai-multi-lane; }; / { dsp0: fixed_tdm_dummy_codec0 { #sound-dai-cells = <1>; compatible = "test,fixed_tdm"; }; card0: sound { #address-cells = <1>; #size-cells = <0>; status = "okay"; compatible = "simple-audio-card"; simple-audio-card,name = "dsp0"; simple-audio-card,dai-link@0 { reg = <0>; format = "left_j"; bitclock-master = <&link0_master>; frame-master = <&link0_master>; link0_cpu: cpu { sound-dai = <&sai5 0>; }; link0_master: codec { sound-dai = <&dsp0 0>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; frame-master; bitclock-master; }; }; simple-audio-card,dai-link@1 { reg = <1>; format = "left_j"; bitclock-master = <&link1_master>; frame-master = <&link1_master>; cpu { sound-dai = <&sai5 1>; }; link1_master: codec { sound-dai = <&dsp0 1>; dai-tdm-slot-num = <8>; dai-tdm-slot-width = <32>; frame-master; bitclock-master; }; }; }; };

When the simple-card driver fails to load, it prints:

[ 7.289407] asoc-simple-card: probe of sound failed with error -22

Has anyone been able to use these SAIs with multiple data lines?

Thanks in advance for any feedback.

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i.MX8M Mini, sai5 with multiple data lines