linux-kernel - [PATCH 1/6] arm64: dts: imx8mn-beacon: Enable Digitial Microphone

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Date:   Sun, 17 Jul 2022 13:09:55 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Adam Ford <aford173@...il.com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.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>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] arm64: dts: imx8mn-beacon: Enable Digitial Microphone

There is a PDM microphone on the baseboard which is connected to the
micfil controller.  Create a new sound card to support this interface.

Signed-off-by: Adam Ford <aford173@...il.com>

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi
index 9e82069c941f..fa66cc9bf455 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-beacon-baseboard.dtsi
@@ -63,7 +63,7 @@ reg_usb_otg_vbus: regulator-usb {
 		enable-active-high;
 	};
 
-	sound {
+	sound-codec {
 		compatible = "fsl,imx-audio-wm8962";
 		model = "wm8962-audio";
 		audio-cpu = <&sai3>;
@@ -76,6 +76,18 @@ sound {
 			"AMIC", "MICBIAS",
 			"IN3R", "AMIC";
 	};
+
+	sound-micfil {
+		compatible = "fsl,imx-audio-card";
+		model = "imx-audio-micfil";
+		pri-dai-link {
+			link-name = "micfil hifi";
+			format = "i2s";
+			cpu {
+				sound-dai = <&micfil>;
+			};
+		};
+	};
 };
 
 &ecspi2 {
@@ -150,6 +162,16 @@ &easrc {
 	status = "okay";
 };
 
+&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 = <196608000>;
+	status = "okay";
+	#sound-dai-cells = <0>;
+};
+
 &sai3 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_sai3>;
@@ -232,6 +254,13 @@ 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
-- 
2.34.1