Been digging through these forums for a few weeks now as I attempt to debug my PCM1865 ADC with a Raspberry Pi Compute Module 4.
Here is my current .dts file
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2711";
fragment@0 {
target = <&i2c1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
pcm1865: pcm1865@4a {
compatible = "ti,pcm1865";
reg = <0x4a>;
#sound-dai-cells = <0>;
clocks = <&external_clock>;
clock-names = "mclk";
};
};
};
fragment@1 {
target-path = "/";
__overlay__ {
external_clock: clock {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <24000000>; // 24MHz clock frequency
};
};
};
fragment@2 {
target = <&i2s>;
__overlay__ {
status = "okay";
};
};
fragment@3 {
target-path = "/";
__overlay__ {
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "pcm1865";
simple-audio-card,format = "i2s";
simple-audio-card,widgets =
"Line", "Stereo Line In";
simple-audio-card,routing =
"Stereo Line In", "VINL1",
"Stereo Line In", "VINR1";
simple-audio-card,cpu {
sound-dai = <&i2s>;
};
simple-audio-card,codec {
sound-dai = <&pcm1865>;
simple-audio-card,bitclock-master = <&sound>;
simple-audio-card,frame-master = <&sound>;
};
};
};
};
};
Some additional context - I am using an external clock, tied into the appropriate pins as well as have external power supplies for avdd, ivdd, and iovdd - after compiling these show up as dummy regulators in dmesg.
After compiling and loading the dtoverlay, I confirm that the soundcard exists with `arecord -l` and that the appropriate gain levels are set with `amixer`.
No errors are showing up in my dtoverlay on boot/recording, and I have confirmed that the i2c address is correct - but I'm not getting any audio input.
Hoping that an experienced TI engineer can notice an obvious flaw in either my code or my schematic.
