是否有 pin22 & pin24 接 Dmic Example?

[tonyone0902]

40 pin HAT 那邊 pin22 & pin24 分別有 PDM CLK & PDM Data，請問如果在 ubuntu 環境下如何透過這兩個腳位直接擷取 Dmic 音訊呢？

[george]

• DTS is modified as follows

diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-cp4.dts b/arch/arm64/boot/dts/rockchip/rk3588s-cp4.dts
index dc232a407a8c..da9796bfe7a3 100755
--- a/arch/arm64/boot/dts/rockchip/rk3588s-cp4.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-cp4.dts
@@ -223,6 +223,24 @@ codec {
                 };
         };
 
+       pdmics: dummy-codec {
+        status = "okay";
+        compatible = "rockchip,dummy-codec";
+        #sound-dai-cells = <0>;
+    };
+
+    pdm_mic_array: pdm-mic-array {
+        status = "okay";
+        compatible = "simple-audio-card";
+        simple-audio-card,name = "rockchip,pdm-mic-array";
+        simple-audio-card,cpu {
+            sound-dai = <&pdm1>;
+        };
+        simple-audio-card,codec {
+            sound-dai = <&pdmics>;
+        };
+    };
+       
        leds: leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -944,6 +962,14 @@ &route_hdmi0 {
        status = "okay";
 };
 
+&pdm1 {
+    status = "okay";
+    rockchip,path-map = <0 1 2 3>;
+    #sound-dai-cells = <0>;
+    pinctrl-names = "default";
+    pinctrl-0 = <&pdm1m1_clk &pdm1m1_sdi1>;
+};
+
 &i2c0 {
        status = "okay";
        pinctrl-names = "default";
@@ -1301,7 +1327,7 @@ ir_key1 {
 
 &spi0 {
        pinctrl-names = "default";
-       status = "okay";
+       status = "disabled";
 
        max-freq = <48000000>; /* spi internal clk, don't modify */
         spi_dev@0 {

• Device information

coolpi@Ubuntu:~$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 2: rockchipes8316c [rockchip,es8316-codec], device 0: fe470000.i2s-ES8316 HiFi es8316.7-0010-0 [fe470000.i2s-ES8316 HiFi es8316.7-0010-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 3: rockchippdmmica [rockchip,pdm-mic-array], device 0: fe4c0000.pdm-dummy_codec dummy-codec-0 [fe4c0000.pdm-dummy_codec dummy-codec-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

[tonyone0902]

@george

Thanks!