基于RK3288 平台 Simple card声卡添加及调试-蒲公英云

基于RK3288 平台 Simple card声卡添加及调试

基于RK3288 平台 Simple card声卡添加及调试
Simple card即简单通用的machine driver，如果simple-card框架足够满足需求，建议优先使用simple card框架，简单，方便，且易用.

一、添加声卡

添加codec driver，比如添加：sound/soc/codec/es8323.c
修改sound/soc/codec/Kconfig以及Makefile加入驱动编译。
sound/soc/codec/Kconfig: 添加
select SND_SOC_ES8323 if I2C
config SND_SOC_ES8323
```
 tristate "Everest Semi ES8323 CODEC"  
 depends on I2C  
```
sound/soc/codec/Makefile: 添加
snd-soc-es8323-objs := es8323.o
obj-$(CONFIG_SND_SOC_ES8323) += snd-soc-es8323.o
menuconfig中enable simple card以及codec
make menuconfig Device Drivers —-> Sound card support —-> Advanced Linux Sound Architecture —-> ALSA for SoC audio support —-> ASoC support for Rockchip
CODEC drivers —->
<*> Everest Semi ES8323 CODEC
产品的DTS中添加Simple Card Node

二、修改DTS文件
1 添加sound card 和 spdif（可选添加，用不到不用添加）
2 添加：&i2c2(es8323 mclk)和&i2s(es8323 I2S通信)
3 添加&sound
注意，需要增加内容如下：
{\
sound: sound {
status = “okay”;
compatible = “simple-audio-card”;
simple-audio-card,format = “i2s”;
simple-audio-card,name = “rockchip,firefly-codec”;
simple-audio-card,mclk-fs = <512>;
simple-audio-card,widgets =
“Microphone”, “Microphone Jack”,
“Headphone”, “Headphone Jack”;
simple-audio-card,routing =
“MIC1”, “Microphone Jack”,
“MIC2”, “Microphone Jack”,
“Microphone Jack”, “micbias1”,
“Headphone Jack”, “HPOL”,
“Headphone Jack”, “HPOR”;

            simple-audio-card,dai-link@0 \{   
                    format = "i2s";  
                    cpu \{   
                            sound-dai = <&i2s>;  
                    \};  
                    codec \{   
                            sound-dai = <&es8323>;  
                    \};  
            \};  
            simple-audio-card,dai-link@1 \{   
                    format = "i2s";  
                    cpu \{   
                            sound-dai = <&i2s>;  
                    \};  
                    codec \{   
                            sound-dai = <&hdmi>;  
                    \};  
            \};  
    \};  
     spdif\_out: spdif-out \{   
            status = "okay";  
            compatible = "linux,spdif-dit";  
            \#sound-dai-cells = <0>;  
    \};  
    spdif-sound \{   
            status = "okay";  
            compatible = "simple-audio-card";  
            simple-audio-card,name = "ROCKCHIP,SPDIF";  
            simple-audio-card,cpu \{   
                    sound-dai = <&spdif>;  
            \};  
            simple-audio-card,codec \{   
                    sound-dai = <&spdif\_out>;  
            \};

}

&i2c2 {
status = “okay”;

    es8323: es8323@10 \{   
            status = "okay";  
            compatible = "everest,es8323";  
            reg = <0x10>;  
            spk-con-gpio = <&gpio5 12 GPIO\_ACTIVE\_LOW>;

// hp-det-gpio = <&gpio7 15 GPIO_ACTIVE_LOW>;
clock-names = “mclk”;
clocks = <&cru SCLK_I2S0_OUT>;
pinctrl-names = “default”;
pinctrl-0 = <&i2s0_mclk>;
#sound-dai-cells = <0>;
};
};
需要注意的是，如上es8323的clocks即mclk， upstream代码遵循谁使用clk谁申请的原则，所以后续自己添加的codec driver，如果有使用

外部clk作为mclk，需要做同样的适配。

&i2s {
#sound-dai-cells = <0>;
status = “okay”;
};
&sound {
status = “okay”;
};

注意要去掉以下内容，否则声卡驱动无法挂载
&es8323 {
// aux-det-gpio = <&gpio2 15 GPIO_ACTIVE_HIGH>;
spk-ctl-gpio = <&gpio7 2 GPIO_ACTIVE_HIGH>;
};
三、总结
1 屏幕不亮的问题
调试中发现屏幕背光是亮的，但是屏幕不亮，把vcc_sys_5v: vcc-sys-5v，gpio GPIO0_B5 修改为GPIO7_A3屏幕就亮了。
如下所示：
vcc_sys_5v: vcc-sys-5v{
compatible = “regulator-fixed”;
enable-active-high;
gpio = <&gpio7 3 GPIO_ACTIVE_HIGH>;
pinctrl-names = “default”;
pinctrl-0 = <&pwr5v_en>;
regulator-name = “vcc_sys_5v”;
regulator-min-microvolt = <5000000>;
regulator-max-microvolt = <5000000>;
regulator-always-on;
regulator-boot-on;
};

    vcc-sys \{   
            pwr5v\_en: pwr5v-en \{   
                    rockchip,pins = <7 3 RK\_FUNC\_GPIO &pcfg\_output\_high>;  
            \};  
    \};

2 调试中声卡总是挂载不上去：在dts中去掉以下内容后就可以了。因为在I2C2中已经设置过
&es8323 {
// aux-det-gpio = <&gpio2 15 GPIO_ACTIVE_HIGH>;
spk-ctl-gpio = <&gpio7 2 GPIO_ACTIVE_HIGH>;
};