[PATCH 3/4] arm64: dts: imx8mn-beacon: Add DMIC support

[Adam Ford]

The baseboard has a connector for a pulse density microphone.
This is connected via the micfil interface and uses the DMIC
audio codec with the simple-audio-card.

Signed-off-by: Adam Ford <aford173@xxxxxxxxx>

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi
index 16761975f56e..0b51c0c71423 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi
@@ -4,6 +4,12 @@
  */
 
 / {
+	dmic_codec: dmic-codec {
+		compatible = "dmic-codec";
+		num-channels = <1>;
+		#sound-dai-cells = <0>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -74,6 +80,22 @@ reg_usb_otg_vbus: regulator-usb {
 		enable-active-high;
 	};
 
+	sound-dmic {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "dmic";
+		simple-audio-card,format = "pdm";
+		simple-audio-card,bitclock-master = <&dailink_master>;
+		simple-audio-card,frame-master = <&dailink_master>;
+
+		dailink_master: simple-audio-card,cpu {
+			sound-dai = <&micfil>;
+		};
+
+		simple-audio-card,codec {
+			sound-dai = <&dmic_codec>;
+		};
+	};
+
 	sound-wm8962 {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "wm8962";
@@ -221,6 +243,16 @@ mipi_csi_in: endpoint {
 	};
 };
 
+&micfil {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pdm>;
+	assigned-clocks = <&clk IMX8MN_CLK_PDM>;
+	assigned-clock-parents = <&clk IMX8MN_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <49152000>;
+	status = "okay";
+	#sound-dai-cells = <0>;
+};
+
 &sai3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_sai3>;
@@ -311,6 +343,13 @@ MX8MN_IOMUXC_SAI2_MCLK_GPIO4_IO27		0x19
 		>;
 	};
 
+	pinctrl_pdm: pdmgrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_SAI5_RXC_PDM_CLK	0xd6
+			MX8MN_IOMUXC_SAI5_RXD0_PDM_BIT_STREAM0	0xd6
+		>;
+	};
+
 	pinctrl_reg_usb_otg: reg-otggrp {
 		fsl,pins = <
 			MX8MN_IOMUXC_SAI3_RXC_GPIO4_IO29     0x19
-- 
2.39.2