Hifi Shield 2 Support (Odroid C2)

lcgh · January 9, 2021 at 11:12 AM

Dear all,

is there a chance to get the Hifi Shield 2 (Odroid C2) working under LE?

It seems it is possible for Hifi Shield+ Odroid C2 + HiFi Shield+ but HifiShield 2 was not mentioned.

The specs are here accessory:sound:hifi_shield [ODROID Wiki]

It seems it requires the following kernel modules (see instructions at the page linked above):

Code

modprobe aml_i2c
modprobe snd-soc-pcm512x
modprobe snd-soc-pcm512x-i2c
echo pcm5242 0x4c > /sys/class/i2c-adapter/i2c-1/new_device
modprobe snd-soc-odroid-dac2

Thanks and best.

**chewitt** · January 9, 2021 at 1:19 PM Official Post

Not much chance of it being supported under the legacy kernel as AFAICT it was never supported and we've abandoned all work on the 3.14 codebase after LE 9.0 and diverted our attention to modern (5.10+) kernels which while promsing, are still a bit work in progress.

If you can point me to some more recent Linux 5.4-ish (or newer) device tree (overlay) snippets needed to make the shield work, I'd be happy to see if we can get it working on a newer kernel.

lcgh · January 9, 2021 at 5:36 PM

Thanks, I don't know how to find easily the kernel modules, but armbian would be a starting point: GitHub - armbian/linux: Armbian kernel mirrors which supports odroid c2 directly Odroid C2 – Armbian. I just have to install their image to see whether they provide all necessary kernel modules. It is based on kernel 5.9.x.

lcgh · January 15, 2021 at 11:53 AM

Dear all,

CoreElec has implemented the Hifi Shield 2 per default (works for Odroid C2 + Hifi Shield 2 -> stereo as well as spdif work out of the box via Kodi). Thanks.

**chewitt** · January 16, 2021 at 5:35 AM Official Post

I won't bother making any futher effort then. G'night.

ds000 · February 3, 2024 at 4:33 PM

For getting SPDIF output to work on recent LibreELEC (11.0), I had to modify the device tree file to actually enable it and make it visible to KODI (creating packages/linux/patches/default/linux-080-odroid-c2.patch):

Diff

--- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2-unpatched.dts    2023-11-05 01:19:49.197991036 +0100
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts    2023-11-05 01:29:18.041481346 +0100
@@ -174,6 +174,13 @@
        };
    };

+    spdif_dit: audio-codec-0 {
+        #sound-dai-cells = <0>;
+        compatible = "linux,spdif-dit";
+        status = "okay";
+        sound-name-prefix = "DIT";
+    };
+
    sound {
        compatible = "amlogic,gx-sound-card";
        model = "ODROID-C2";
@@ -184,33 +191,46 @@
        assigned-clock-rates = <294912000>,
                       <270950400>,
                       <393216000>;
-
        dai-link-0 {
-            sound-dai = <&aiu AIU_CPU CPU_I2S_FIFO>;
-        };
+                        sound-dai = <&aiu AIU_CPU CPU_I2S_FIFO>;
+                };

-        dai-link-1 {
-            sound-dai = <&aiu AIU_CPU CPU_I2S_ENCODER>;
-            dai-format = "i2s";
-            mclk-fs = <256>;
-
-            codec-0 {
-                sound-dai = <&aiu AIU_HDMI CTRL_I2S>;
-            };
-        };
-
-        dai-link-2 {
-            sound-dai = <&aiu AIU_HDMI CTRL_OUT>;
-
-            codec-0 {
-                sound-dai = <&hdmi_tx>;
-            };
-        };
+                dai-link-1 {
+                        sound-dai = <&aiu AIU_CPU CPU_SPDIF_FIFO>;
+                };
+
+                dai-link-2 {
+                        sound-dai = <&aiu AIU_CPU CPU_I2S_ENCODER>;
+                        dai-format = "i2s";
+                        mclk-fs = <256>;
+
+                        codec-0 {
+                                sound-dai = <&aiu AIU_HDMI CTRL_I2S>;
+                        };
+                };
+
+                dai-link-3 {
+                        sound-dai = <&aiu AIU_CPU CPU_SPDIF_ENCODER>;
+
+                        codec-0 {
+                                sound-dai = <&spdif_dit>;
+                        };
+                };
+
+                dai-link-4 {
+                        sound-dai = <&aiu AIU_HDMI CTRL_OUT>;
+
+                        codec-0 {
+                                sound-dai = <&hdmi_tx>;
+                        };
+                };
    };
};

&aiu {
    status = "okay";
+    pinctrl-0 = <&spdif_out_ao_6_pins &i2s_am_clk_pins &i2s_out_ao_clk_pins &i2s_out_lr_clk_pins &i2s_out_ch01_ao_pins>;
+    pinctrl-names = "default";
};

&cec_AO {
@@ -278,8 +299,8 @@
&gpio_ao {
    gpio-line-names = "UART TX", "UART RX", "VCCK En", "TF 3V3/1V8 En",
              "USB HUB nRESET", "USB OTG Power En",
-              "J7 Header Pin2", "IR In", "J7 Header Pin4",
-              "J7 Header Pin6", "J7 Header Pin5", "J7 Header Pin7",
+              "SPDIF_OUTPUT", "IR In", "I2S_MCLK",
+              "I2S_SCLK", "I2S_LRCLK", "I2S_DATA_OUTPUT",
              "HDMI CEC", "SYS LED",
              /* GPIO_TEST_N */
              "";

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That worked for me a couple of month ago with SPDIF, unfortunately fried the board, thus unable to test it again.