arm64: dts: librem5-devkit: add the simcom 7100 modem and audio

Add the simcom SIM7100 modem and the sai6 interface that connects it.
Signed-off-by: NAngus Ainslie (Purism) <angus@akkea.ca>
Signed-off-by: NMartin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts

@@ -148,6 +148,11 @@
 		regulator-always-on;
 	};
 
+	wwan_codec: sound-wwan-codec {
+		compatible = "option,gtm601";
+		#sound-dai-cells = <0>;
+	};
+
 	sound {
 		compatible = "simple-audio-card";
 		simple-audio-card,name = "sgtl5000";
@@ -176,6 +181,22 @@
 		};
 	};
 
+	sound-wwan {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "SIMCom SIM7100";
+		simple-audio-card,format = "dsp_a";
+
+		simple-audio-card,cpu {
+			sound-dai = <&sai6>;
+		};
+
+		telephony_link_master: simple-audio-card,codec {
+			sound-dai = <&wwan_codec>;
+			frame-master;
+			bitclock-master;
+		};
+	};
+
 	vibrator {
 		compatible = "gpio-vibrator";
 		pinctrl-names = "default";
@@ -618,6 +639,15 @@
 		>;
 	};
 
+	pinctrl_sai6: sai6grp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_SAI1_RXD5_SAI6_RX_DATA0	0xd6
+			MX8MQ_IOMUXC_SAI1_RXD6_SAI6_RX_SYNC	0xd6
+			MX8MQ_IOMUXC_SAI1_TXD4_SAI6_RX_BCLK     0xd6
+			MX8MQ_IOMUXC_SAI1_TXD5_SAI6_TX_DATA0	0xd6
+		>;
+	};
+
 	pinctrl_typec: typecgrp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_NAND_DATA06_GPIO3_IO12		0x16
@@ -802,6 +832,16 @@
 	status = "okay";
 };
 
+&sai6 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_sai6>;
+	assigned-clocks = <&clk IMX8MQ_CLK_SAI6>;
+	assigned-clock-parents = <&clk IMX8MQ_AUDIO_PLL1_OUT>;
+	assigned-clock-rates = <24576000>;
+	fsl,sai-synchronous-rx;
+	status = "okay";
+};
+
 &uart1 { /* console */
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;