[IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3

expman99 — Tue, 05 Nov 2019 16:28:47 GMT

Hello,
I have a custom board based on iMX8MM-EVK. I would like to connect PCM1754 (controlled in a hardware mode) to the board via I2S audio output without any configuration via SPI or I2C.
I am not familiar with sound field, and below things that all I tried to do the work.
I used "simple-audio-card" driver, declared the board as master device, and PCM1754 as "linux,snd-soc-dummy" (applied this patch https://patchwork.kernel.org/patch/7679391), that played slave role.

Device tree:

pcm1754: pcm1754 {
 compatible = "linux,snd-soc-dummy";
 #sound-dai-cells = <0>;
 status = "okay";
};
 
sound-pcm1754 {
 compatible = "simple-audio-card";
 simple-audio-card,name = "pcm1754";
 simple-audio-card,format = "i2s";
 simple-audio-card,bitclock-master = <&dailink0_master>;
 simple-audio-card,frame-master = <&dailink0_master>;
 simple-audio-card,widgets =
 "Line", "Line Out";
 simple-audio-card,routing =
 "Line Out", "LLOUT",
 "Line Out", "RLOUT";
 
dailink0_master: simple-audio-card,cpu {
 sound-dai = <&sai3>;
 };
 
simple-audio-card,codec {
 sound-dai = <&pcm1754>;
 };
};
 
&sai3 {
 pinctrl-names = "default";
 pinctrl-0 = <&pinctrl_sai3>;
 assigned-clocks = <&clk IMX8MM_CLK_SAI3_SRC>,
 <&clk IMX8MM_CLK_SAI3_DIV>;
 assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
 assigned-clock-rates = <0>, <24576000>;
 #sound-dai-cells = <0>;
 status = "okay";
};‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

pcm1754 soundcard appeared after boot, and It's the only playback soundcard (hw:0,0) .

.asoundrc:

pcm.dmix_192000
{
 type dmix
 ipc_key 5678293
 ipc_key_add_uid yes
 slave{
 pcm "hw:0,0"
 period_time 40000
 format S24_LE
 rate 192000
 }
}
 
pcm.iMic
{
 type hw
 card "Mic"
}
 
pcm.imx8{
 type asym
 playback.pcm "dmix_192000"
 capture.pcm "iMic"
}
 
pcm.!default
{
 type plug
 route_policy "average"
 slave.pcm "imx8"
}
 
ctl.!default
{
 type plug
 route_policy "average"
 slave.pcm "imx8"
}
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

But there was no sound out to speaker connected to codec IC when I played a sound file.
Please help me correct any mistakes.

Thank you,

Re: [IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3

igorpadykov — Tue, 05 Nov 2019 23:23:36 GMT

Hi Tu

for i.MX8M Mini "simple-audio-card" example one can look on

https://community.nxp.com/thread/504807

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: [IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3

expman99 — Wed, 06 Nov 2019 02:11:53 GMT

Thanks igorpadykov,

I have checked this thread before, but it seems to not my case.

i.MX Processors中的主题 [IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3

[IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3

Re: [IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3

Re: [IMX8MMINILPD4-EVK - Yocto - Audio] Connect hardware-controlled code IC via I2S use SAI3