问题描述：

ES8388 喇叭+PDM回采 4+2配置如下：

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解决方案：

	// MICpdmics: dummy-codec {status = "okay";compatible = "rockchip,dummy-codec";#sound-dai-cells = <0>;};// MICpdm_mic_array: pdm-mic-array {status = "okay";compatible = "simple-audio-card";simple-audio-card,name = "rockchip,pdm-mic-array";simple-audio-card,cpu {sound-dai = <&pdm0>;};simple-audio-card,codec {sound-dai = <&pdmics>;};};// 声卡ES8388es8388_sound: es8388-sound {status = "okay";compatible = "rockchip,multicodecs-card";rockchip,card-name = "rockchip-es8388";// hp-det-gpio = <&gpio1 RK_PC4 GPIO_ACTIVE_HIGH>;io-channels = <&saradc 3>;io-channel-names = "adc-detect";keyup-threshold-microvolt = <1800000>;poll-interval = <100>;// SPK_CTL_H 喇叭脚自行配置spk-con-gpio = <&gpioX RK_PXX GPIO_ACTIVE_HIGH>;// 耳机控制GPIO// hp-con-gpio = <&gpio4 RK_PA7 GPIO_ACTIVE_HIGH>;linein-type = <0>;rockchip,format = "i2s";rockchip,mclk-fs = <256>;rockchip,cpu = <&i2s0_8ch>;rockchip,codec = <&es8388>;rockchip,audio-routing ="Headphone", "LOUT1","Headphone", "ROUT1","Speaker", "LOUT2","Speaker", "ROUT2","Headphone", "Headphone Power","Headphone", "Headphone Power","Speaker", "Speaker Power","Speaker", "Speaker Power","LINPUT1", "Main Mic","LINPUT2", "Main Mic","RINPUT1", "Headset Mic","RINPUT2", "Headset Mic";// pinctrl-names = "default";// pinctrl-0 = <&es_det>;play-pause-key {label = "playpause";linux,code = <KEY_PLAYPAUSE>;press-threshold-microvolt = <2000>;};};&i2c7 {status = "okay";//这里需要根据新老SDK配置 clock部分的配置不一样//新SDK如下es8388: es8388@11 {status = "okay";#sound-dai-cells = <0>;compatible = "everest,es8388", "everest,es8323";reg = <0x11>;clocks = <&mclkout_i2s0>;clock-names = "mclk";assigned-clocks = <&mclkout_i2s0>;assigned-clock-rates = <12288000>;pinctrl-names = "default";pinctrl-0 = <&i2s0_mclk>;};//旧SDK如下es8388: es8388@11 {status = "disabled";#sound-dai-cells = <0>;compatible = "everest,es8388", "everest,es8323";reg = <0x11>;clocks = <&cru I2S0_8CH_MCLKOUT>;clock-names = "mclk";assigned-clocks = <&cru I2S0_8CH_MCLKOUT>;assigned-clock-rates = <12288000>;pinctrl-names = "default";pinctrl-0 = <&i2s0_mclk>;
};// 根据原理图自行配置clk 和sdi通路 有几路配置几路
&pdm0 {status = "okay";// 通道顺序 自行配置//rockchip,path-map = <0 1 2 3>;pinctrl-names = "default";pinctrl-0 = <&pdm0m0_clk1&pdm0m0_sdi0  &pdm0m0_sdi2>;
};

使用查看声音命令 cat /proc/asound/cards 如下
如声卡未能注册成功，自行使用 dmesg | grep pdm 检查相关声音注册是否有报错，需要注意pdm的sdio脚是否有复用，如果复用需要去除。

以上声卡注册成功后，使用命令进行录音采集。因为回采使用系统的录音应用是录制不到声音的。
使用 tinycap /mnt/rec.wav -D 1 -d 0 –c 4 对声卡1进行声音录制。
使用adb pull /mnt/rec.wav E:\ 将声音转出

最后使用电脑端的Audacity软件播放声音查看声道如下：

这里可以看到声音被正常录制到，左右声道正常。

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