工厂废品小爱同学mini的重生（4）——

博通wifi芯片的坑

小爱同学用的wifi芯片和树莓派zero的差不太多，不难解决

&mmc1 {pinctrl-names = "default";pinctrl-0 = <&mmc1_pg_pins>;vmmc-supply = <&reg_aldo1>;mmc-pwrseq = <&wifi_pwrseq>;bus-width = <4>;non-removable;status = "okay";
};&uart1 {pinctrl-names = "default";pinctrl-0 = <&uart1_pg_pins>, <&uart1_cts_rts_pg_pins>;uart-has-rtscts;status = "okay";bluetooth {compatible = "brcm,bcm43438-bt";clocks = <&rtc 1>;clock-names = "lpo";vbat-supply = <&reg_dldo1>;vddio-supply = <&reg_aldo3>;device-wakeup-gpios = <&r_pio 0 10 GPIO_ACTIVE_HIGH>; /* PL10 */host-wakeup-gpios = <&r_pio 0 9 GPIO_ACTIVE_HIGH>; /* PL9 */shutdown-gpios = <&r_pio 0 8 GPIO_ACTIVE_HIGH>; /* PL8 */};
};&reg_dldo1 {regulator-always-on;regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-name = "vcc-wifi0";
};&reg_dldo2 {regulator-always-on;regulator-min-microvolt = <3300000>;regulator-max-microvolt = <3300000>;regulator-name = "vcc-wifi1";
};wifi_pwrseq: wifi_pwrseq {compatible = "mmc-pwrseq-simple";reset-gpios = <&r_pio 0 6 GPIO_ACTIVE_LOW>; /* PL06 */clocks = <&rtc 1>;clock-names = "ext_clock";};

全志 sun8i 声音的坑

一开始在内核里勾选 sun8i-codec 发现在启动时alsa根本认不出系统的声卡。研究设备树发现sun8i的codec是通过i2s连接，并依赖simple-card和sun4i-i2s这两个内核模块，勾选以下的内核模块问题得到解决

        CONFIG_SND_SUN8I_CODEC CONFIG_SND_SUN8I_ADDA_PR_REGMAP=y CONFIG_SND_SOC_XTFPGA_I2S=y CONFIG_ZX_TDM=y CONFIG_SND_SIMPLE_CARD=y CONFIG_SND_SOC_I2C_AND_SPI=y CONFIG_SND_SUN8I_CODEC_ANALOG

同时要在设备树里开启codec

&sound {/* Board level jack widgets */simple-audio-card,widgets = "Microphone", "Microphone Jack","Headphone", "Headphone Jack";/* Board level routing. First 2 routes copied from SoC level */simple-audio-card,routing ="Left DAC", "AIF1 Slot 0 Left","Right DAC", "AIF1 Slot 0 Right","HP", "HPCOM","Headphone Jack", "HP","MIC1", "Microphone Jack","Microphone Jack", "MBIAS";status = "okay";
};&dai {status = "okay";
};&codec {status = "okay";
};

编译后内核是认出来声卡了，但是没有声音，分析了下电路发现是要使能功放(PH05)，不太会设备树，就暂且把它写成一颗led

 leds {compatible = "gpio-leds";codecd {label = "love:codecd:power";gpios = <&r_pio 0 5 GPIO_ACTIVE_LOW>;default-state = "on";};};

把一个喇叭接到后面的接口上小爱就有声音了！！
可以用gmediarender推送dlna了

尚未解决的坑： AC108 CODEC

小爱同学mini有两个版本，一种是有两颗ac108，一种是只有一颗ac108,在全志tina的4.9内核里有这个驱动，还有树莓派的seeed 麦克风HAT用了这个芯片。然而个人水平有限，还没有解决问题。主要是tina的驱动过不了编译，改了许多地方仍然出错。而树莓派HAT的驱动虽然支持主线但是它是基于simple-card重新造了一套轮子，导致和simple-card不能通用，也就是说声音和录音只能选一个。。。。。

一些尝试

sun4i-i2s 在主线中并不支持dsp_a模式，所以5.4内核要想用dsp_a需要使用5.7内核中的驱动，并且重新写一个sound设备树节点和定义a33的i2s节点。

别问我是怎么知道的。。。

定义A33的i2s

     i2s0: i2s@1c22000 {#sound-dai-cells = <0>;compatible = "allwinner,sun6i-a31-i2s";reg = <0x01c22000 0x400>;interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;clocks = <&ccu CLK_BUS_I2S0>, <&ccu CLK_I2S0>;clock-names = "apb", "mod";resets = <&ccu RST_BUS_I2S0>;dmas = <&dma 3>, <&dma 3>;dma-names = "rx", "tx";status = "disabled";};i2s1: i2s@1c22400 {#sound-dai-cells = <0>;compatible = "allwinner,sun6i-a31-i2s";reg = <0x01c22400 0x400>;interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;clocks = <&ccu CLK_BUS_I2S1>, <&ccu CLK_I2S1>;clock-names = "apb", "mod";resets = <&ccu RST_BUS_I2S1>;dmas = <&dma 4>, <&dma 4>;dma-names = "rx", "tx";status = "disabled";};

在pinctrl里加入i2s占用的引脚

/*i2s0 pins*/i2s0_pins_bclk: i2s0@0 {pins = "PB5";function = "i2s0";};i2s0_pins_lrck: i2s0@1 {pins = "PB4";function = "i2s0";};i2s0_pins_do0: i2s0@2 {pins = "PB6";function = "i2s0";};i2s0_pins_di: i2s0@3 {pins = "PB7";function = "i2s0";};/*i2s1 pins*/i2s1_pins_bclk: i2s1@0 {pins = "PG11";function = "i2s1";};i2s1_pins_lrck: i2s1@1 {pins = "PG10";function = "i2s1";};i2s1_pins_do0: i2s1@2 {pins = "PG12";function = "i2s1";};i2s1_pins_di: i2s1@3 {pins = "PG13";function = "i2s1";};

小爱设备树中加入sound1节点
写了两个版本，用hat驱动的就只是替换一下simple-card字段就不放了

     sound1: sound@1 {compatible = "simple-audio-card";simple-audio-card,format = "dsp_a";simple-audio-card,name = "ac108-4mic-voicecard"; status = "disabled";simple-audio-card,bitclock-master = <&codec_dai>;simple-audio-card,frame-master = <&codec_dai>;simple-audio-card,channels-playback-override = <4>;simple-audio-card,channels-capture-override  = <4>;cpu_dai: simple-audio-card,cpu {sound-dai = <&i2s0>;dai-tdm-slot-num     = <2>;dai-tdm-slot-width   = <32>;dai-tdm-slot-tx-mask = <1 1 0 0>;dai-tdm-slot-rx-mask = <1 1 0 0>;};codec_dai: simple-audio-card,codec {sound-dai = <&ac108_a>;clocks =  <&ac108_mclk>;};};

使能i2s0 和 i2c1

 &i2s0 {#sound-dai-cells = <0>;#address-cells = <1>;#size-cells = <0>;pinctrl-0 = <&i2s0_pins_bclk &i2s0_pins_lrck &i2s0_pins_do0 &i2s0_pins_di>;pinctrl-names = "default";status = "okay";
};&i2c1 {#address-cells = <1>;#size-cells = <0>;status = "okay";ac108_a: ac108@3b{compatible = "x-power,ac108_0";reg = <0x3b>;#sound-dai-cells = <0>;data-protocol = <0>;};
};

使用seeed-voice-card的驱动虽然可以认到声卡，但是录音时会出现问题

arecord也可以认出设备

头疼。。。

希望有大神可以帮忙指点一下。。。。。
相关的我已经放到一个仓库里了。。。。
白嫖