如题，经过测量，bclk和lrck是有信号的
但是sdi和mclk上边没有信号。
驱动使用的是1126的SDK里面自带的驱动：kernel-4.19\sound\soc\codecs\tlv320aic3x.c
tlv320aic3x.rar
下边是我的设备树配置：
/{
sound0: sound@0 {
compatible = "simple-audio-card";
simple-audio-card,name = "v2v,codec-aic3104";
simple-audio-card,widgets =
"Line", "Line Out",
"Line", "Line In";
simple-audio-card,routing =
"Line Out", "LLOUT",
"Line Out", "RLOUT",
"MIC2L", "Line In",
"MIC2R", "Line In";
simple-audio-card,format = "i2s";
simple-audio-card,mclk-fs = <256>;
//simple-audio-card,bitclock-master = <&sound0_master>;
//simple-audio-card,frame-master = <&sound0_master>;
//simple-audio-card,bitclock-inversion;
simple-audio-card,cpu {
sound-dai = <&i2s0_8ch>;
};
simple-audio-card,codec {
sound-dai = <&tlv320aic3104>;
};
};
};
&i2c2 {
clock-frequency = <400000>;
status = "okay";
tlv320aic3104: tlv320aic3104@18{
#sound-dai-cells = <0>;
compatible = "ti,tlv320aic3104";
reg = <0x18>;
status = "okay";
reset-gpios = <&gpio2 RK_PB1 GPIO_ACTIVE_LOW>;
AVDD-supply = <&vcc_3v3>;
IOVDD-supply = <&vcc_3v3>;
DRVDD-supply = <&vcc_3v3>;
DVDD-supply = <&vcc_1v8>;
//感觉这个时钟有问题。
clocks = <&cru HCLK_I2S0>;
clock-names = "mclk";
};
};另外其中引用到的一个节点i2s0_8ch的定义是：
/ {
i2s0_8ch: i2s@ff800000 {
compatible = "rockchip,rv1126-i2s-tdm";
reg = <0xff800000 0x1000>;
interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&cru MCLK_I2S0_TX>, <&cru MCLK_I2S0_RX>, <&cru HCLK_I2S0>;
clock-names = "mclk_tx", "mclk_rx", "hclk";
dmas = <&dmac 20>, <&dmac 19>;
dma-names = "tx", "rx";
resets = <&cru SRST_I2S0_TX_M>, <&cru SRST_I2S0_RX_M>;
reset-names = "tx-m", "rx-m";
rockchip,cru = <&cru>;
rockchip,grf = <&grf>;
pinctrl-names = "default";
pinctrl-0 = <&i2s0m0_sclk_tx
&i2s0m0_sclk_rx
&i2s0m0_lrck_tx
&i2s0m0_lrck_rx
&i2s0m0_sdi0
&i2s0m0_sdo0
&i2s0m0_sdo1_sdi3
&i2s0m0_sdo2_sdi2
&i2s0m0_sdo3_sdi1>;
status = "disabled";
};
};
&i2s0_8ch {
status = "okay";
#sound-dai-cells = <0>;
rockchip,clk-trcm = <1>;
rockchip,i2s-rx-route = <3 1 2 0>;
pinctrl-names = "default";
pinctrl-0 = <&i2s0m0_sclk_tx
&i2s0m0_lrck_tx
&i2s0m0_sdo0
&i2s0m0_sdo1_sdi3>;
};我们板子上使用的rv1126的引脚是：
i2s0_sclk_tx_m0
i2s0_mclk_m0
i2s0_lrck_tx_m0
i2s0_sdo0_m0
i2s0_sdi0_m0
录音测试 arecord -D hw:0,0 -f cd -d 10 test.wav
发现录不到任何东西，mclk和sdi上边没有电平变化，bclk和lrclk有变化。
通过阅读内核自带的驱动程序，发现里面并没有处理mclk相关的代码，甚至都没有获取时钟的代码。。。
实在不知如何是好，求助大家，谢谢了。
.
最近编辑记录 WM_CH (2021-07-07 16:35:59)
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播放语音mclk有时钟吗？
刚刚试了一下，播放的时候也没有mclk，但是sdo是有波形的。执行命令时，耳机能听到一个爆炸声，但是没有正常的声音出来。
所以我感觉我sdi那个引脚应该也没有设置正确。。。
最近编辑记录 WM_CH (2021-07-07 16:44:34)
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i2s有主从之分，如果rk做从机，他不提供mclk，而是由声卡提供mclk，鉴于你听到了爆炸音，看下是不是声卡做主机了?
不知道怎么配置主从方式:(
这是网上一个tlv320aic3104的设备树例子。。。
https://e2echina.ti.com/support/audio/f/audio-forum/197512/am5728-tlv320aic3104/613969#613969
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why不用rk809？自带音频coder，decoder,speaker amplifier。
最近编辑记录 电子垃圾专业改造 (2021-09-05 23:59:59)
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没指定mclk引脚，mclk也选错了，“感觉这个时钟有问题”！
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tlv320aic3104支持从bclk产生mclk，可以参考一下器件user guide.
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