S195xDTS: define dabfm input

Add a definition of DAB/FM sound card:
 - SPI on ECSPI1, reset on GPIO05_I09 (torvalds#105)
 - DAI link on SAI6
 - bit & ws clocks from ADC
 - SAI2 enabled to provide MCLK for ADC, but bit & ws clocks slave

Based on: POC by Tony Gao <[email protected]>

For this to work reliably, only the ADC should provide I2S clocks,
SAI1, SAI2 and SAI6 being slaves on RX side. All three, or at least
two (depending on AUX/HDMI_SWITCH) are connected to ADC in StreamKit
1955.
At the same time, SAI2 has to provide continuous master clock for ADC.

Signed-off-by: Andriy Danylovskyy <[email protected]>

Author: ada-streamunlimited

arch/arm64/boot/dts/streamunlimited/fsl-imx8mm-sue-stream195x-kit1955-dabfm.dtsi

@@ -0,0 +1,127 @@
+/*
+ * arch/arm64/boot/dts/streamunlimited/fsl-imx8mm-sue-stream195x-kit1955-dabfm.dtsi
+ *
+ * Copyright (C) 2021 StreamUnlimited, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ */
+
+/*
+ * DT for the removable dabfm module.
+ */
+
+/ {
+	sue {
+		daughterboard = "dabfm";
+	};
+
+	sound-dabfm {
+		compatible = "sue,stream195x-audio";
+		sue-card,name = "dabfm";
+
+		sue-card,dai-link@2 {
+			format = "i2s";
+
+			frame-master = <&dailink2_codec>;
+			bitclock-master = <&dailink2_codec>;
+
+			dailink2_cpu: cpu {
+				sound-dai = <&sai6>;
+				dai-tdm-slot-num = <2>;
+				dai-tdm-slot-width = <32>;
+			};
+
+			dailink2_codec: codec {
+				use-dummy-codec;
+			};
+		};
+	};
+
+	sound-sai2 {
+		compatible = "sue,stream195x-audio";
+		sue-card,name = "sai2card";
+
+		sue-card,dai-link@4 {
+			format = "i2s";
+
+			frame-master = <&dailink4_codec>;
+			bitclock-master = <&dailink4_codec>;
+
+			continuous-clock;
+
+			dailink4_cpu: cpu {
+				sound-dai = <&sai2>;
+				dai-tdm-slot-num = <2>;
+				dai-tdm-slot-width = <32>;
+			};
+
+			dailink4_codec: codec {
+				use-dummy-codec;
+			};
+		};
+	};
+
+};
+
+&ecspi1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1_cs>;
+	num-cs = <1>;
+	cs-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
+	status = "okay";
+
+	dabfm: dabfm@0 {
+		status = "okay";
+		reg = <0>;
+		compatible = "sue,dabfm";
+		/* It's set to 10MHz which is 1MHz more than dabfm driver,
+		 * which is different from stream1832 where they are same
+		 */
+		spi-max-frequency = <10000000>;
+	};
+};
+
+&sai6 {
+	#sound-dai-cells = <0>;	/* This is required for the simple-audio-card to work */
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai6_rx>;
+	/* override interrupt since it's using same one as SAI5 by default */
+	interrupts = <GIC_SPI 50 IRQ_TYPE_LEVEL_HIGH>;
+
+	status = "okay";
+
+	/*
+	 * This is conjunction with `dai-tdm-slot-num = <2>;` makes sure that
+	 * for 8 channel playback 8 ch / 2 slots = 4 pins are used with a mask
+	 * of 0xf.
+	 * /
+	/* first number is pins, second is rx mask, third is tx mask */
+	fsl,dataline = <
+		1 0x1 0x1
+		2 0x3 0x3
+		3 0x7 0x7
+		4 0xf 0xf
+	>;
+	fsl,sai-asynchronous;
+};
+
+&sai2 {
+	#sound-dai-cells = <0>;	/* This is required for the simple-audio-card to work */
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai2_rx &pinctrl_sai2_clk>;
+
+	assigned-clocks = <&clk IMX8MM_CLK_SAI2>;
+	assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <24576000>;
+
+	status = "okay";
+};

arch/arm64/boot/dts/streamunlimited/fsl-imx8mm-sue-stream195x-kit1955.dtsi

@@ -203,6 +203,20 @@
 			>;
 		};
 
+		pinctrl_ecspi1: ecspi1grp {
+			fsl,pins = <
+				MX8MM_IOMUXC_ECSPI1_SCLK_ECSPI1_SCLK	(PAD_CTL_PE_DOWN | PAD_CTL_FAST | PAD_CTL_HYS | PAD_CTL_DSE4x)
+				MX8MM_IOMUXC_ECSPI1_MOSI_ECSPI1_MOSI	(PAD_CTL_PE_DOWN | PAD_CTL_FAST | PAD_CTL_HYS | PAD_CTL_DSE4x)
+				MX8MM_IOMUXC_ECSPI1_MISO_ECSPI1_MISO	(PAD_CTL_PE_DOWN | PAD_CTL_FAST | PAD_CTL_HYS)
+			>;
+		};
+
+		pinctrl_ecspi1_cs: ecspi1cs {
+			fsl,pins = <
+				MX8MM_IOMUXC_ECSPI1_SS0_GPIO5_IO9		(PAD_CTL_PE_DOWN | PAD_CTL_HYS)
+			>;
+		};
+
 		pinctrl_sai1_rx: sai1rxgrp {
 			fsl,pins = <
 				MX8MM_IOMUXC_SAI1_RXFS_SAI1_RX_SYNC		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST)
@@ -227,6 +241,20 @@
 			>;
 		};
 
+		pinctrl_sai2_rx: sai2rxgrp {
+			fsl,pins = <
+				MX8MM_IOMUXC_SAI2_RXD0_SAI2_RX_DATA0		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST)
+				MX8MM_IOMUXC_SAI2_RXC_SAI2_RX_BCLK		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST | PAD_CTL_DSE4x)
+				MX8MM_IOMUXC_SAI2_RXFS_SAI2_RX_SYNC		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST | PAD_CTL_DSE4x)
+			>;
+		};
+
+		pinctrl_sai2_clk: sai2clkgrp {
+			fsl,pins = <
+				MX8MM_IOMUXC_SAI2_MCLK_SAI2_MCLK		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST | PAD_CTL_DSE4x)
+			>;
+		};
+
 		pinctrl_sai5_rx: sai5rxgrp {
 			fsl,pins = <
 				MX8MM_IOMUXC_SAI5_RXD0_SAI5_RX_DATA0		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST)
@@ -238,6 +266,14 @@
 			>;
 		};
 
+		pinctrl_sai6_rx: sai6rxgrp {
+			fsl,pins = <
+				MX8MM_IOMUXC_SAI1_RXD5_SAI6_RX_DATA0		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST)
+				MX8MM_IOMUXC_SAI1_RXD4_SAI6_RX_BCLK		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST | PAD_CTL_DSE4x)
+				MX8MM_IOMUXC_SAI1_RXD6_SAI6_RX_SYNC		(PAD_CTL_PE_DOWN | PAD_CTL_HYS | PAD_CTL_FAST | PAD_CTL_DSE4x)
+			>;
+		};
+
 		pinctrl_uart1: uart1grp {
 			fsl,pins = <
 				MX8MM_IOMUXC_UART1_RXD_UART1_DCE_RX	(PAD_CTL_PE_DOWN | PAD_CTL_HYS)

arch/arm64/boot/dts/streamunlimited/fsl-imx8mm-sue-stream195x-l0-kit1955.dts

@@ -5,3 +5,4 @@
 #include "fsl-imx8mm-sue-stream195x-kit-lcd.dtsi"
 #include "fsl-imx8mm-sue-stream195x-kit1955-touchscreen.dtsi"
 #include "fsl-imx8mm-sue-stream195x-kit1955-pcmd3180.dtsi"
+#include "fsl-imx8mm-sue-stream195x-kit1955-dabfm.dtsi"