Working Config SPDIFRX

[timsurber]

Hello, do you have any advice what has to be done to enable SPDIFRX on STM32MP157F-DK2 (I know, I have to add the hardware receiver module)

My linux devicetree contains:

spdifrx_pins_mx: spdifrx_mx-0 {
    pins {
        pinmux = <STM32_PINMUX('D', 7, AF9)>; /* SPDIFRX_IN0 */
        bias-disable;
    };
};

spdifrx_sleep_pins_mx: spdifrx_sleep_mx-0 {
    pins {
        pinmux = <STM32_PINMUX('D', 7, ANALOG)>; /* SPDIFRX_IN0 */
    };
};

[...]

spdif_in: spdif-in {
    #sound-dai-cells = <0>;
    compatible = "linux,spdif-dir";
    status = "okay";

    spdif_in_port: port {
        spdif_in_endpoint: endpoint {
            remote-endpoint = <&spdifrx_endpoint>;
        };
    };
};

sound{
    compatible = "audio-graph-card";
    label = "STM32MP15-DK";
    routing = "Playback", "MCLK",
            "Capture", "MCLK",
            "MICL", "Mic Bias";
    dais = <&sai2a_port &sai2b_port &i2s2_port  &spdifrx_port>;
    status = "okay";
};

[...]

&spdifrx{
    pinctrl-names = "default", "sleep";
    pinctrl-0 = <&spdifrx_pins_mx>;
    pinctrl-1 = <&spdifrx_sleep_pins_mx>;
    status = "okay";

    /* USER CODE BEGIN spdifrx */
    spdifrx_port: port {
        spdifrx_endpoint: endpoint {
            remote-endpoint = <&spdif_in_endpoint>;
        };
    };
    /* USER CODE END spdifrx */
};

Also I compiled CONFIG_SND_SOC_STM32_SPDIFRX into the kernel.

But alsamixer in the capture tab shows no SPDIF recording device.

[kmaincent]

Hello,

Does the spdifrx driver probe well? Do you see any error on the dmesg about it: dmesg | grep -i spdi dmesg | grep -i sound dmesg | grep -i snd

Could you do the same with debug log level enabled if there is nothing from the command above?

[timsurber]

Hey, thank you for your answer. Here are the outputs of the commands:

# dmesg | grep -i spdi
[    0.095256] platform 4000d000.audio-controller: Fixed dependency cycle(s) with /spdif-in
[    2.207794] st,stm32-spdifrx 4000d000.audio-controller: No cache defaults, reading back from HW
[    4.786594] spdif-dir spdif-in: ASoC: sink widget Capture overwritten

# dmesg | grep -i sound
[    0.125976] Advanced Linux Sound Architecture Driver Initialized.
[    2.472173]   No soundcards found.

# dmesg | grep -i snd
[    0.276953] usbcore: registered new interface driver snd-usb-audio

# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: STM32MP15DK [STM32MP15-DK], device 1: 4400b024.audio-controller-cs42l51-hifi cs42l51-hifi-1 [4400b024.audio-controller-cs42l51-hifi cs42l51-hifi-1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: STM32MP15DK [STM32MP15-DK], device 2: 4000b000.audio-controller-i2s-hifi i2s-hifi-2 [4000b000.audio-controller-i2s-hifi i2s-hifi-2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: STM32MP15DK [STM32MP15-DK], device 3: 4000d000.audio-controller-dir-hifi dir-hifi-3 [4000d000.audio-controller-dir-hifi dir-hifi-3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

# arecord -L
null
    Discard all samples (playback) or generate zero samples (capture)

[kmaincent]

[ 4.786594] spdif-dir spdif-in: ASoC: sink widget Capture overwritten It seems the sink name "Capture" is used twice. Could you try to add this parameter to spdif_in node: sound-name-prefix = "spdif0";