linux ADAU1761音频驱动之内核配置（二）

本帖最后由ぉ沙皮狗的忧伤于 2020-3-18 15:44 编辑

1、在内核中添加ADAU1761工具以及修改配置
(1)在内核中添加ADAU1761工具alsa工具
#make menuconfig
Device Drivers  --->
   <*> Sound card support  --->
         <*>Advanced Linux Sound Architecture  --->
            <*>ALSA for SoC audio support  --->
               --- ALSA for SoC audio support
               <*> Audio support for Analog Devices reference designs
               <*>    AXI-I2S support
               <*>    AXI-SPDIF support
               < > AMD Audio Coprocessor support
               < > SoC Audio for the Atmel System-on-Chip
               < > Synopsys I2S Device Driver
                        SoC Audio for Freescale CPUs  --->
               < > Hisilicon I2S controller
               [ ] Audio support for Imagination Technologies designs
                        STMicroelectronics STM32 SOC audio support
               < > Audio support for the the Xilinx DisplayPor
               <*> Audio support for the the Xilinx audio formatter
               <*> Audio support for the the Xilinx I2S
               < > XTFPGA I2S master
               < > ZTE ZX TDM Driver Support
                        CODEC drivers  --->
                        <*> Analog Devices AU1761 CODEC - I2C
               <*> ASoC Simple sound card support
               < > ASoC Simple SCU sound card support
               < > ASoC Audio Graph sound card support
               < > ASoC Audio Graph SCU sound card support

(2)将内核目录下firmware用附件中的文件替换，并修改.config文件

CONFIG_EXTRA_FIRMWARE="adau1761.bin"
CONFIG_EXTRA_FIRMWARE_DIR="./firmware"
注：firmware目录下的文件好像是alsa配置文件，从zed内核中抠出来的

(3)修改.config，根据zynq_1761.dtsi中compatible中的名称在.config中查看是否配置，未配置则配置一下

注：①、修改.config就是make menuconfig配置内核，添加相应模块
②、因为zynq_1761.dtsi文件是描述vivado工程下面一些ip核硬件信息，而在.config中添加相应的代码相当于给设备添加驱动，

下面是我在我的.config中添加的，自己要去对照着zynq_1761.dtsi去修改
CONFIG_COMMON_CLK_AXI_CLKGEN=y

CONFIG_SND_SIMPLE_CARD=y
CONFIG_SND_SIMPLE_SCU_CARD=y

make all

make uImage
将arch/arm/boot/uImage拷到SD卡中

2、修改设备树
(1)、在arch/arm/boot/dts/zynq-myc-c7z020.dts设备树中i2c节点下添加子节点
      &i2c0 {
            status = "okay";
            clock-frequency = <400000>;
            xlnx,has-interrupt = <0x1>;

            ds1307: ds1307@68 {
                     compatible = "dallas,ds1307";
                     reg = <0x68>;
                     #clock-cells = <1>;
            };

            adau1761: adau1761@3b {
                     compatible = "adi,adau1761";
                     reg = <0x3b>;
                     clocks = <&audio_clock>;
                     clock-names = "mclk";
                     #sound-dai-cells = <0>;
            };

      };

(2)、在zynq-1761.dtsi文件中添加以下代码
/ {
      amba_pl: amba_pl {
            compatible = "simple-bus";
            #address-cells = <0x1>;
            #size-cells = <0x1>;
            ranges;

            axi_i2s_0: axi-i2s@77600000 {
                     compatible = "adi,axi-i2s-1.00.a";
                     reg = <0x77600000 0x1000>;
                     dmas = <&dmac_s 1 &dmac_s 2>;
                     dma-names = "tx", "rx";
                     clocks = <&clkc 15>, <&audio_clock>;
                     clock-names = "axi", "ref";

                     #sound-dai-cells = <0>;
            };

            axi_sysid_0: axi-sysid-0@45000000 {
                     compatible = "adi,axi-sysid-1.00.a";
                     reg = <0x45000000 0x10000>;
            };
      };

      hdmi_clock: axi-clkgen@79000000 {
            compatible = "adi,axi-clkgen-2.00.a";
            reg = <0x79000000 0x10000>;
            #clock-cells = <0>;
            clocks = <&clkc 16>;
      };

      audio_clock: audio_clock {
            compatible = "fixed-clock";
            #clock-cells = <0>;
            clock-frequency = <12288000>;
            //clock-frequency = <24576000>;
      };

      zed_sound {
            compatible = "simple-audio-card";
            simple-audio-card,name = "ZED ADAU1761";
            simple-audio-card,widgets =
                     "Microphone", "Mic In",
                     "Headphone", "Headphone Out",
                     "Line", "Line In",
                     "Line", "Line Out";
            simple-audio-card,routing =
                     "Line Out", "LOUT",
                     "Line Out", "ROUT",
                     "Headphone Out", "LHP",
                     "Headphone Out", "RHP",
                     "Mic In", "MICBIAS",
                     "LINN", "Mic In",
                     "RINN", "Mic In",
                     "LAUX", "Line In",
                     "RAUX", "Line In";

            simple-audio-card,dai-link@0 {
                     format = "i2s";
                     cpu {
                              sound-dai = <&axi_i2s_0>;
                              frame-master;
                              bitclock-master;
                     };
                     codec {
                              sound-dai = <&adau1761>;
                     };
            };
      };

};

make all
make dts

将arch/arm/boot/dts中的system-top.dtb.dtb拷贝到SD卡中

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