linux-kernel - [PATCH 2/4] arm64: dts: imx8mm-beacon: Add DMIC support

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Message-Id: <20230831115128.254226-2-aford173@gmail.com>
Date:   Thu, 31 Aug 2023 06:51:26 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] arm64: dts: imx8mm-beacon: Add DMIC support

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@...il.com>

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
index 313e93663d6f..d0dd4c81a557 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-beacon-baseboard.dtsi
@@ -6,6 +6,13 @@
 #include <dt-bindings/phy/phy-imx8-pcie.h>
 
 / {
+
+	dmic_codec: dmic-codec {
+		compatible = "dmic-codec";
+		num-channels = <1>;
+		#sound-dai-cells = <0>;
+	};
+
 	leds {
 		compatible = "gpio-leds";
 
@@ -98,6 +105,22 @@ reg_usdhc2_vmmc: regulator-usdhc2 {
 		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";
@@ -228,6 +251,16 @@ pca6416_1: gpio@21 {
 	};
 };
 
+&micfil {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pdm>;
+	assigned-clocks = <&clk IMX8MM_CLK_PDM>;
+	assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <49152000>;
+	status = "okay";
+	#sound-dai-cells = <0>;
+};
+
 &mipi_csi {
 	status = "okay";
 	ports {
@@ -365,6 +398,13 @@ MX8MM_IOMUXC_SAI2_MCLK_GPIO4_IO27		0x19
 		>;
 	};
 
+	pinctrl_pdm: pdmgrp {
+		fsl,pins = <
+			MX8MM_IOMUXC_SAI5_RXC_PDM_CLK	0xd6
+			MX8MM_IOMUXC_SAI5_RXD0_PDM_DATA0	0xd6
+		>;
+	};
+
 	pinctrl_reg_usb_otg1: usbotg1grp {
 		fsl,pins = <
 			MX8MM_IOMUXC_SAI3_RXC_GPIO4_IO29     0x19
-- 
2.39.2