MLK-16929-3: dts: arm64: fsl imx8mq evk pdm mic support

Add pdm mic support on imx8mq evk platform
Hardware modifications connect PDM mic:

PDM pin    SAI-3 pad    Test point
------------------------------------
BCLK       SAI3_RXC     TP1802
DATA       SAI3_RXD     TP1804

Signed-off-by: Adrian Alonso <adrian.alonso@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>

3 files changed, 65 insertions, 1 deletions

diff --git a/Documentation/devicetree/bindings/sound/imx-pdm-mic.txt b/Documentation/devicetree/bindings/sound/imx-pdm-mic.txt
new file mode 100644
index 000000000000..bde8313cba7e
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/imx-pdm-mic.txt
@@ -0,0 +1,16 @@
+Freescale i.MX audio complex PDM microphone
+
+Required properties:
+- compatible: "fsl,imx-pdm-mic"
+- model: The user-visible name of this sound complex
+- audio-cpu : The phandle of the i.MX SAI controller
+- decimation : The PDM decimation factor <64>
+
+Example:
+
+sound-pdm {
+	compatible = "fsl,imx-pdm-mic";
+	model = "imx-pdm-audio";
+	audio-cpu = <&sai3>;
+	decimation = <64>;
+};
diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index d27b51b730be..69ae9481424d 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -47,7 +47,8 @@ dtb-$(CONFIG_ARCH_FSL_IMX8MQ) += fsl-imx8mq-evk.dtb \
 				 fsl-imx8mq-evk-pcie1-m2.dtb \
 				 fsl-imx8mq-evk-lcdif-adv7535.dtb \
 				 fsl-imx8mq-evk-lcdif-rm67191.dtb \
-				 fsl-imx8mq-evk-mipi-csi2.dtb
+				 fsl-imx8mq-evk-mipi-csi2.dtb \
+				 fsl-imx8mq-evk-pdm.dtb
 
 always		:= $(dtb-y)
 subdir-y	:= $(dts-dirs)
diff --git a/arch/arm64/boot/dts/freescale/fsl-imx8mq-evk-pdm.dts b/arch/arm64/boot/dts/freescale/fsl-imx8mq-evk-pdm.dts
new file mode 100644
index 000000000000..a2e84eea463b
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/fsl-imx8mq-evk-pdm.dts
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017 NXP
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "fsl-imx8mq-evk.dts"
+
+/ {
+	sound-pdm {
+		compatible = "fsl,imx-pdm-mic";
+		model = "imx-pdm-audio";
+		audio-cpu = <&sai3>;
+		decimation = <64>;
+		status = "okay";
+	};
+};
+
+&iomuxc {
+	imx8mq-evk {
+		pinctrl_sai3: sai3grp {
+			fsl,pins = <
+				MX8MQ_IOMUXC_SAI3_RXC_SAI3_RX_BCLK	0xd6
+				MX8MQ_IOMUXC_SAI3_RXD_SAI3_RX_DATA0	0xd6
+			>;
+		};
+	};
+};
+
+&sai3 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai3>;
+	assigned-clocks = <&clk IMX8MQ_CLK_SAI3_SRC>,
+			<&clk IMX8MQ_CLK_SAI3_DIV>;
+	assigned-clock-parents = <&clk IMX8MQ_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <0>, <24576000>;
+	status = "okay";
+};