[参考译文] TAS5805M：支持器件树、适用于地层上的双 TAS5805M DAC 配置

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Other Parts Discussed in Thread: TAS5805M, TAS2781

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1502196/tas5805m-support-with-the-device-tree-for-dual-tas5805m-dac-configuration-on-raspbian

器件型号：TAS5805M
主题中讨论的其他器件： TAS5805、 TAS2781

工具/软件：

我将使用两个以2.1主/从配置连接的 TAS5805M DAC 构建 Raspberry Pi HAT。我使用的原理图非常接近数据表建议值、可在此处获取。我遇到的问题是为该 Hat for Raspbian 构建正确的设备树。

我从 Raspberry Pi HAT 开始、具有一个单路 TAS5805M DAC 以及该主题中的驱动器实现。我做了几个调整,使它构建为最新的内核版本和设备树 , 可以在这里找到它运行得很好!

现在、我正在尝试添加一个秒但无法使其正常工作。我得到的最接近的是这个旋转的设备树 主 DAC 使用 TAS5805M 驱动器、它可按预期播放音频。

/dts-v1/;
/plugin/;

/ {
    compatible = "brcm,bcm2835";

    fragment@0 {
        target = <&i2s>;
        __overlay__ {
            status = "okay";
        };
    };

    fragment@1 {
        target = <&i2c1>;
        __overlay__ {
            status = "okay";
            clock-frequency = <400000>;
            #address-cells = <1>;
            #size-cells = <0>;

            tas5805m_master: tas5805m@2e {
                #sound-dai-cells = <0>;
                compatible = "ti,tas5805m";
                reg = <0x2e>;
                pvdd-supply = <&vdd_3v3_reg>;
                pdn-gpios = <&gpio 4 0>;
                ti,dsp-config-name = "2.0_basic";
                sound-name-prefix = "Main";
            };

            tas5805m_slave: tas5805m@2f {
                #sound-dai-cells = <0>;
                compatible = "ti,tas5805m";
                reg = <0x2f>;
                pvdd-supply = <&vdd_3v3_reg>;
                pdn-gpios = <&gpio 5 0>;
                ti,dsp-config-name = "1.0_basic";
                sound-name-prefix = "Woofer";
            };
        };
    };

    fragment@2 {
        target = <&sound>;
        __overlay__ {
            status = "okay";
            compatible = "simple-audio-card";
            label = "Louder-Raspberry-2X";
            simple-audio-card,widgets =
                "Speaker", "Speaker";
            simple-audio-card,routing =
                "Speaker", "Main OUTA",
                "Speaker", "Main OUTB";
                // "Speaker", "Woofer OUTA",
                // "Speaker", "Woofer OUTB";
            simple-audio-card,dai-link {
                format = "i2s";
                bitclock-master = <&dailink_master>;
                frame-master = <&dailink_master>;
                dailink_master: simple-audio-card,cpu {
                    sound-dai = <&i2s>;
                    dai-tdm-slot-num = <2>;
                    dai-tdm-slot-width = <32>;
                };
                codec@0 {
                    sound-dai = <&tas5805m_master>;
                };
                // codec@1 {
                //     sound-dai = <&tas5805m_slave>;
                // };
            };
        };
    };
};

但只要我注释掉 codec@1 该段和相应的 routing 段、就会在初始化时报告错误

Apr 15 17:51:25 lab-louder-pi-04 kernel:  tas5805m-amplifier-tas5805m-amplifier: substream tas5805m-amplifier-tas5805m-amplifier has no playback, no capture
Apr 15 17:51:25 lab-louder-pi-04 kernel: asoc-simple-card soc:sound: ASoC: can't create pcm tas5805m-amplifier-tas5805m-amplifier :-22
Apr 15 17:51:25 lab-louder-pi-04 kernel: asoc-simple-card: probe of soc:sound failed with error -22

我希望您可能会看到我的做法有误、

5 个月前