arm64: dts: apple: Fill device node for dp2hdmi on Macbook Pros

The HDMI output on the 14 and 16 inch Macbook Pros with M1/M2 Pro/Max is
driven by an unused ATC port using the phy and crossbar. The DP output
from any dcpext display controller is routed to a Kinetic DP2HDMI
converter (MCDP2920 and a unknown HDMI 2.1 capable variant).

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

arch/arm64/boot/dts/apple/t600x-j314-j316.dtsi

@@ -21,6 +21,7 @@
 		atcphy3 = &atcphy3;
 		bluetooth0 = &bluetooth0;
 		dcp = &dcp;
+		dcpext0 = &dcpext0;
 		disp0 = &display;
 		disp0_piodma = &disp0_piodma;
 		serial0 = &serial0;
@@ -73,6 +74,44 @@
 	};
 };
 
+&display {
+	iommus = <&disp0_dart 0>, <&dispext0_dart 0>;
+};
+
+&dispext0_dart {
+	status = "okay";
+};
+
+&dcpext0_dart {
+	status = "okay";
+};
+
+&dcpext0_mbox {
+	status = "okay";
+};
+
+&dcpext0 {
+	/* enabled by the loader */
+	apple,connector-type = "HDMI-A";
+
+	/*  HDMI HPD gpio, used as interrupt*/
+	hdmi-hpd-gpios = <&pinctrl_nub 15 GPIO_ACTIVE_HIGH>;
+
+	hdmi-pwren-gpios = <&smc_gpio 23 GPIO_ACTIVE_HIGH>;
+	dp2hdmi-pwren-gpios = <&smc_gpio 6 GPIO_ACTIVE_HIGH>;
+
+	phys = <&atcphy3 PHY_TYPE_DP>;
+	phy-names = "dp-phy";
+	mux-controls = <&atcphy3_xbar 0>;
+	mux-control-names = "dp-xbar";
+	mux-index = <0>;
+	apple,dptx-phy = <3>;
+};
+
+&atcphy3_xbar {
+	status = "okay";
+};
+
 /* USB Type C */
 &i2c0 {
 	hpm0: usb-pd@38 {

arch/arm64/boot/dts/apple/t602x-j414-j416.dtsi

@@ -34,6 +34,11 @@
 	apple,always-on;
 };
 
+&dcpext0 {
+	/*  HDMI HPD gpio, used as interrupt*/
+	hdmi-hpd-gpios = <&pinctrl_aop 25 GPIO_ACTIVE_HIGH>;
+};
+
 &hpm0 {
 	interrupts = <44 IRQ_TYPE_LEVEL_LOW>;
 };