arm64: dts: apple: t6020-j474,t6021-j475: Enable dcpext0/dptx-phy/dp2hdmi

After all parts are in place enable the DCP on the M2 Pro Mac Mini and
the M2 Max Mac Studio for HDMI output. Use dcpext0 for HDMI out.

dcp on t8112 and t602x does not wake up after sleep + reset but dcpext*
does. Use dcpext0 for sharing the code with M1* devices.
My interpretation of the tea leaves from Apple's marketing department
suggests that dcpext is more capable (6k 60Hz vs 5k 60Hz) so use dcpext
as long as only one is used.

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

Author: jannau

arch/arm64/boot/dts/apple/t6020-j474s.dts

@@ -63,6 +63,57 @@
 	model = "Mac mini J474";
 };
 
+&lpdptxphy {
+	status = "okay";
+};
+
+#define USE_DCPEXT0 1
+
+#if USE_DCPEXT0
+/ {
+	aliases {
+		dcpext0 = &dcpext0;
+		/delete-property/ dcp;
+	};
+};
+
+&framebuffer0 {
+	power-domains = <&ps_dispext0_cpu0>, <&ps_dptx_phy_ps>;
+};
+
+&dcp {
+	status = "disabled";
+};
+&display {
+	iommus = <&dispext0_dart 0>;
+};
+&dispext0_dart {
+	status = "okay";
+};
+&dcpext0_dart {
+	status = "okay";
+};
+&dcpext0_mbox {
+	status = "okay";
+};
+&dcpext0 {
+#else
+&dcp {
+#endif
+	status = "okay";
+	apple,connector-type = "HDMI-A";
+
+	/*  HDMI HPD gpio, used as interrupt*/
+	hdmi-hpd-gpios = <&pinctrl_aop 25 GPIO_ACTIVE_HIGH>;
+
+	hdmi-pwren-gpios = <&smc_gpio 23 GPIO_ACTIVE_HIGH>;
+	dp2hdmi-pwren-gpios = <&smc_gpio 25 GPIO_ACTIVE_HIGH>;
+
+	phys = <&lpdptxphy>;
+	phy-names = "dp-phy";
+	apple,dptx-phy = <4>;
+};
+
 &gpu {
 	/* Apple does not do this, but they probably should */
 	apple,perf-base-pstate = <3>;

arch/arm64/boot/dts/apple/t6021-j475c.dts

@@ -58,6 +58,58 @@
 	model = "Mac Studio J475";
 };
 
+&lpdptxphy {
+	status = "okay";
+};
+
+
+#define USE_DCPEXT0 1
+
+#if USE_DCPEXT0
+/ {
+	aliases {
+		dcpext0 = &dcpext0;
+		/delete-property/ dcp;
+	};
+};
+
+&framebuffer0 {
+	power-domains = <&ps_dispext0_cpu0>, <&ps_dptx_phy_ps>;
+};
+
+&dcp {
+	status = "disabled";
+};
+&display {
+	iommus = <&dispext0_dart 0>;
+};
+&dispext0_dart {
+	status = "okay";
+};
+&dcpext0_dart {
+	status = "okay";
+};
+&dcpext0_mbox {
+	status = "okay";
+};
+&dcpext0 {
+#else
+&dcp {
+#endif
+	status = "okay";
+	apple,connector-type = "HDMI-A";
+
+	/*  HDMI HPD gpio, used as interrupt*/
+	hdmi-hpd-gpios = <&pinctrl_aop 25 GPIO_ACTIVE_HIGH>;
+
+	hdmi-pwren-gpios = <&smc_gpio 23 GPIO_ACTIVE_HIGH>;
+	dp2hdmi-pwren-gpios = <&smc_gpio 25 GPIO_ACTIVE_HIGH>;
+
+	phys = <&lpdptxphy>;
+	phy-names = "dp-phy";
+	apple,dptx-phy = <4>;
+};
+
 &gpu {
 	apple,idleoff-standby-timer = <3000>;
 	apple,perf-base-pstate = <5>;

arch/arm64/boot/dts/apple/t602x-j474-j475.dtsi

@@ -21,11 +21,6 @@
 	power-domains = <&ps_dispext0_cpu0>, <&ps_dptx_phy_ps>;
 };
 
-/* disable dcp until it is supported */
-&dcp {
-	status = "disabled";
-};
-
 &hpm0 {
 	interrupts = <44 IRQ_TYPE_LEVEL_LOW>;
 };