Enable audio on UNIHIKER M10 V1.2

Enable the internal codec, I2S2 and onboard microphone route. The board uses codec revision B; that driver support is already accepted in the ASoC for-7.4 tree as commit 157f7cba77a9. It is a runtime dependency, not a change to the existing codec binding.

Changes since v1:
- Normalize author/sender identity and preserve it in the patch body.
- Recheck ordinary and strict checkpatch in the actual Git repository.

Mizuno Miotsuki (1):
arm64: dts: rockchip: Enable audio on DFRobot UNIHIKER M10 V1.2

 .../dts/rockchip/rk3308-unihiker-m10-v1.2.dts | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

base-commit: ae965b9856f033145e292b0c29082a26bcc45efd

2.56.0

From: Mizuno Miotsuki <[email protected]>

Enable the internal RK3308 codec and its I2S2 interface, and add a simple-audio-card. Route the onboard microphone to MIC1 and supply it from MICBIAS1, with the bias set to 85 percent of AVDD as used during board bring-up.

The board does not expose a speaker interface, so no speaker routing is added.

The board uses codec revision B. Support has been accepted in the ASoC for-7.4 branch as commit 157f7cba77a9 ("ASoC: codecs: rk3308: add support for codec revision B"). This is a runtime dependency; the DTS uses the existing codec compatible and bindings.

---
 .../dts/rockchip/rk3308-unihiker-m10-v1.2.dts | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

index 270ea970c95a..7adef454ea89 100644
@@ -54,6 +54,26 @@ sdio_pwrseq: sdio-pwrseq {
 		reset-gpios = <&gpio0 RK_PA2 GPIO_ACTIVE_LOW>;
 	};
 
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "UNIHIKER M10 RK3308 codec";
+		simple-audio-card,format = "i2s";
+		simple-audio-card,mclk-fs = <256>;
+		simple-audio-card,widgets =
+			"Microphone", "Internal Microphone";
+		simple-audio-card,routing =
+			"Internal Microphone", "MICBIAS1",
+			"MIC1", "Internal Microphone";
+
+		simple-audio-card,cpu {
+			sound-dai = <&i2s_8ch_2>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&codec>;
+		};
+	};
+
 	vcc_1v8: regulator-vcc-1v8 {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc_1v8";

@@ -117,6 +137,11 @@ vdd_core: regulator-vdd-core {
 	};
 };
 
+&codec {
+	rockchip,micbias-avdd-percent = <85>;
+	status = "okay";
+};
+
 &cpu0 {
 	cpu-supply = <&vdd_core>;
 };

@@ -131,6 +156,11 @@ &emmc {
 	status = "okay";
 };
 
+&i2s_8ch_2 {
+	#sound-dai-cells = <0>;
+	status = "okay";
+};
+
 &io_domains {
 	vccio0-supply = <&vcc_io>;
 	vccio1-supply = <&vcc_io>;

2.56.0