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| = TLV320AIC3110 = | | == Summary == |
| == Schematics ==
| | Importing file |
| [[File:Tlv320aic3110-schematics-copyright.png|thumb]]
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| | |
| == Device Tree ==
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| <syntaxhighlight/dts-v1/;
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| /plugin/;
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| / {
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| compatible = "brcm,bcm2712", "brcm,bcm2711", "brcm,bcm2835";
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| // compatible = "brcm,bcm2835";
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| | |
| fragment@0 {
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| target = <&i2s_clk_consumer>;
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| __overlay__ {
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| status = "okay";
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| #sound-dai-cells = <0>;
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| brcm,tx-channels = <2>;
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| brcm,rx-channels = <1>;
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| };
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| };
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| fragment@1 {
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| target-path = "/";
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| __overlay__ {
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| status = "okay";
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| codec_1v8_reg: codec-1v8-reg {
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| compatible = "regulator-fixed";
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| regulator-name = "tlv320aic3104_1v8";
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| regulator-min-microvolt = <1800000>;
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| regulator-max-microvolt = <1800000>;
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| regulator-always-on;
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| status = "okay";
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| };
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| };
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| };
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|
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| fragment@2 {
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| target = <&i2c1>;
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| __overlay__ {
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| #address-cells = <1>; /* Single cell for I2C address */
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| #size-cells = <0>; /* No size cells for I2C devices */
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| status = "okay";
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| tlv320aic3110: tlv320aic3110@18 {
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| compatible = "ti-pg,tlv320aic3110", "ti,tlv320aic3110", "ti,tlv320aic311x";
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| reg = <0x18>;
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| #sound-dai-cells = <0>;
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| // system-clock-frequency = <12288000>; // Codec clock config
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| // system-clock-direction-out; // Codec as master
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| status = "okay";
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| HPVDD-supply = <&vdd_3v3_reg>;
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| SPRVDD-supply = <&vdd_5v0_reg>;
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| SPLVDD-supply = <&vdd_5v0_reg>;
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| AVDD-supply = <&vdd_3v3_reg>;
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| IOVDD-supply = <&vdd_3v3_reg>;
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| DVDD-supply = <&codec_1v8_reg>;
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| clocks = <&mclk_external>;
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| clock-names = "mclk";
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| // system-clk-frequency = <12288000>;
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| mclk-frequency = <12288000>;
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| // gpio-controller;
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| reset-gpios = <&gpio 13 1>; // GPIO 13 as active low reset
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| reset-delay-us = <10000>; /* 10ms delay */
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| // Debug properties (must precede subnodes)
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| debug;
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| linux,debug;
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| };
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| };
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| };
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| fragment@3 {
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| target = <&sound>;
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| __overlay__ {
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| compatible = "simple-audio-card";
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| i2s-controller = <&i2s_clk_consumer>;
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| simple-audio-card,name = "TLV320AIC3110";
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| simple-audio-card,format = "i2s";
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| simple-audio-card,convert-rate = <48000>;
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| simple-audio-card,mclk-fs = <256>;
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| simple-audio-card,bitclock-master = <&snd_codec>;
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| simple-audio-card,frame-master = <&snd_codec>;
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| simple-audio-card,widgets =
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| "Microphone", "Mic Jack",
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| "Speaker", "External Speaker";
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| simple-audio-card,routing =
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| "External Speaker", "SPL",
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| "External Speaker", "SPR",
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| "MIC1LP", "Mic Jack",
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| "MIC1LM", "Mic Jack";
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| status = "okay";
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| dailink0_master: simple-audio-card,cpu {
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| sound-dai = <&i2s_clk_consumer>;
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| dai-tdm-slot-num = <2>;
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| dai-tdm-slot-width = <32>;
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| };
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| snd_codec: simple-audio-card,codec {
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| sound-dai = <&tlv320aic3110>;
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| clocks = <&mclk_external>;
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| system-clock-direction-out = "out";
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| system-clock-frequency = <12288000>; //*** added LAX
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| mclk-fs = <256>; //*** added LAX
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| };
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| };
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| };
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| fragment@4 {
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| target-path = "/";
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| __overlay__ {
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| mclk_external: mclk_external {
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| compatible = "fixed-clock";
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| #clock-cells = <0>;
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| clock-frequency = <12288000>; // 12.288 MHz
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| clock-output-names = "mclk";
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| };
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| };
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| };
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| };
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| </syntaxhighlight>
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| == Explanation ==
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| After carefully reading the source code, I finally found the culprit of my issues. Even if the datasheet suggest I can bypass the PLL if use a proper frequency for MCLK (I chose 12.288Mhz and 11.2896Mhz which divided by 256 gives 48Khz and 41.1Khz), the device driver does not support any arbitrary frequency! They have a bunch of lookup tables for clock rates and playback and if your choice is not present, the driver will fail.
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| I modified the source code and added the proper lookups for my custom frequencies
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| Code: Select all
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| /* ADC dividers can be disabled by configuring them to 0 */
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| static const struct aic31xx_rate_divs aic31xx_divs[] = {
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| ...
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| /* 11.2896 MHz (11289600 Hz) */
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| { 11289600, 44100, 1, 7, 6800, 128, 8, 2, 128, 8, 2},
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| /* 12.288 MHz (12288000 Hz) */
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| { 12288000, 44100, 1, 7, 5264, 128, 8, 2, 128, 8, 2},
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| /* 11.2896 MHz (11289600 Hz) */
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| { 11289600, 48000, 1, 7, 6800, 128, 8, 2, 128, 8, 2},
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| /* 12.288 MHz (12288000 Hz) */
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| { 12288000, 48000, 1, 8, 1920, 128, 8, 2, 128, 8, 2},
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| After a fun fight with Ubuntu to compile this, lo and behold, everything plays!
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| Now for my project which involves an Iot device, I don't want to have to include an unsigned device driver that will need DKMS to install with every kernel update, I will redo my PCB hardware oscillator to use a natively supported frequency. I leave as an exercise to the people at TI to write a function that dynamically creates a lookup entry for a random frequency MCLK and playback combo!
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