如何使hdmi和dp音频同时输出不同声音？

luobo

目前的dts配置如下：
i2s2: i2s@ff8a0000 {
                compatible = "rockchip,rk3399-i2s", "rockchip,rk3066-i2s";
                reg = <0x0 0xff8a0000 0x0 0x1000>;
                interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH 0>;
                dmas = <&dmac_bus 4>, <&dmac_bus 5>;
                dma-names = "tx";
                clock-names = "i2s_clk", "i2s_hclk";
                clocks = <&cru SCLK_I2S2_8CH>, <&cru HCLK_I2S2_8CH>;
                resets = <&cru SRST_I2S2_8CH>, <&cru SRST_H_I2S2_8CH>;
                reset-names = "reset-m", "reset-h";
                power-domains = <&power RK3399_PD_SDIOAUDIO>;
                status = "disabled";
};
hdmi_dp_sound: hdmi-dp-sound {
                status = "okay";
                compatible = "rockchip,rk3399-hdmi-dp";
                rockchip,cpu = <&i2s2>;
                rockchip,codec = <&hdmi>, <&cdn_dp>;
};
&i2s2 {
        #sound-dai-cells = <0>;
        //dmas = <&dmac_bus 4>;
        //dma-names = "tx";
        status = "okay";
};
哪位大神能帮忙告知如何操作才能使hdmi和dp同时输出不同的声音，万分感谢！！！

895816513

这是需要在系统上选择的 输入 aplay -l 查看声卡设备，然后在播放音乐用不同的声卡

1. root@firefly:~# aplay -l
   
2. **** List of PLAYBACK Hardware Devices ****
   
3. card 0: rockchiphdmi [rockchip,hdmi], device 0: ff8a0000.i2s-i2s-hifi i2s-hifi-0 []
   
4.   Subdevices: 1/1
   
5.   Subdevice #0: subdevice #0
   
6. card 1: rockchiprt5640c [rockchip,rt5640-codec], device 0: ff890000.i2s-rt5640-aif1 rt5640-aif1-0 []
   
7.   Subdevices: 1/1
   
8.   Subdevice #0: subdevice #0
   
9. card 2: rockchipcdndpso [rockchip-cdndp-sound], device 0: DP PCM spdif-hifi-0 []
   
10.   Subdevices: 1/1
    
11.   Subdevice #0: subdevice #0

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