arm64: dts: fsl: librem5 add the simcom 7100 modem

Add the simcom 7100 on sai6 of the librem5 devkit
Signed-off-by: Angus Ainslie (Purism) <angus@akkea.ca>

arch/arm64/boot/dts/freescale/librem5-evk.dtsi

@@ -109,6 +109,26 @@
                 };
         };
 
+	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 = <&sim7100_codec>;
+                        frame-master;
+                        bitclock-master;
+		};
+	};
+
+	sim7100_codec: sound-wwan-codec {
+		compatible = "simcom,sim7100", "option,gtm601";
+		#sound-dai-cells = <0>;
+	};
+
 #if TODO
 	sound-hdmi {
 		compatible = "fsl,imx-audio-cdnhdmi";
@@ -1122,6 +1142,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_sai6>;
 
+	#sound-dai-cells = <0>;
 	assigned-clocks = <&clk IMX8MQ_CLK_SAI6_ROOT>,
 			<&clk IMX8MQ_CLK_SAI6_DIV>;
 	assigned-clock-parents = <&clk IMX8MQ_CLK_SAI6_DIV>;

arch/arm64/configs/librem5-evk_defconfig

@@ -402,6 +402,7 @@ CONFIG_SND_SOC_FSL_SAI=y
 CONFIG_SND_SOC_FSL_SPDIF=y
 CONFIG_SND_IMX_SOC=y
 CONFIG_SND_SOC_IMX_SGTL5000=y
+CONFIG_SND_SOC_GTM601=m
 CONFIG_SND_SIMPLE_CARD=m
 CONFIG_SND_AUDIO_GRAPH_CARD=m
 # CONFIG_HID_REDRAGON is not set