[PATCH v4 2/2] arm64: dts: rockchip: add RK3588 DP carrier from Theobroma Systems

[Heiko Stuebner <heiko@sntech.de>]

From: Heiko Stuebner <heiko.stuebner@cherry.de>

The DisplayPort carrier is a very simple baseboard only providing serial,
ethernet and a displayport output.

But its main functionality is that it routes the Analogix eDP controller
to this DisplayPort output, which allows to test that controller simply
by hooking it up to a suitable monitor.

The Analogix-DP controller supports eDP 1.3 and DP 1.2, so can drive
both eDP displays as well as full DP monitors. It does not support DP+
so passive DP-to-HDMI adapters won't work.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Link: https://lore.kernel.org/r/20250723190904.37792-3-heiko@sntech.de
---
 arch/arm64/boot/dts/rockchip/Makefile         |   1 +
 .../rk3588-tiger-displayport-carrier.dts      | 119 ++++++++++++++++++
 2 files changed, 120 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3588-tiger-displayport-carrier.dts

diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index ad684e3831bc..3a1739b8f167 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -188,6 +188,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b-pcie-ep.dtbo
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b-pcie-srns.dtbo
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5b-plus.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-rock-5t.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-tiger-displayport-carrier.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-tiger-haikou.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-tiger-haikou-video-demo.dtbo
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-toybrick-x0.dtb
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-tiger-displayport-carrier.dts b/arch/arm64/boot/dts/rockchip/rk3588-tiger-displayport-carrier.dts
new file mode 100644
index 000000000000..c14718bc4fda
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3588-tiger-displayport-carrier.dts
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2024 Cherry Embedded Solutions GmbH
+ */
+
+/dts-v1/;
+#include <dt-bindings/soc/rockchip,vop2.h>
+#include "rk3588-tiger.dtsi"
+
+/ {
+	model = "Theobroma Systems RK3588-Q7 SoM on Tiger Displayport Carrier v1";
+	compatible = "tsd,rk3588-tiger-displayport-carrier", "tsd,rk3588-tiger", "rockchip,rk3588";
+
+	aliases {
+		ethernet0 = &gmac0;
+	};
+
+	chosen {
+		stdout-path = "serial2:115200n8";
+	};
+
+	dp-connector {
+		compatible = "dp-connector";
+		dp-pwr-supply = <&vcc3v3_baseboard>;
+		label = "dp0";
+		type = "full-size";
+
+		port {
+			dp_con_in: endpoint {
+				remote-endpoint = <&edp0_out_con>;
+			};
+		};
+	};
+
+	vcc3v3_baseboard: regulator-vcc3v3-baseboard {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc3v3_baseboard";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc5v0_baseboard>;
+	};
+
+	vcc5v0_baseboard: regulator-vcc5v0-baseboard {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_baseboard";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
+};
+
+&edp0 {
+	/*
+	 * Q7_DP_HPD# but Q7_HDMI_HPD# could be used too
+	 *
+	 * HPD handling in the Analogix-DP not in dp-connector, because
+	 * "Detecting the monitor for DisplayPort targets is more
+	 *  complicated than just reading the HPD pin level" so the
+	 * "actual DP driver (should) perform detection".
+	 * For reference see commit cb640b2ca546 ("drm/bridge:
+	 * display-connector: don't set OP_DETECT for DisplayPorts")
+	 * in the Linux-kernel.
+	 */
+	hpd-gpios = <&gpio4 RK_PB5 GPIO_ACTIVE_LOW>;
+	pinctrl-0 = <&edp0_hpd_l>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&edp0_in {
+	edp0_in_vp2: endpoint {
+		remote-endpoint = <&vp2_out_edp0>;
+	};
+};
+
+&edp0_out {
+	edp0_out_con: endpoint {
+		remote-endpoint = <&dp_con_in>;
+	};
+};
+
+&gmac0 {
+	status = "okay";
+};
+
+&hdptxphy0 {
+	status = "okay";
+};
+
+&pinctrl {
+	edp0 {
+		edp0_hpd_l: edp0-hpd-l-pin {
+			rockchip,pins = <4 RK_PB5 RK_FUNC_GPIO &pcfg_pull_up>;
+		};
+	};
+};
+
+&uart2 {
+	pinctrl-0 = <&uart2m2_xfer>;
+	status = "okay";
+};
+
+&vop {
+	status = "okay";
+};
+
+&vop_mmu {
+	status = "okay";
+};
+
+&vp2 {
+	vp2_out_edp0: endpoint@ROCKCHIP_VOP2_EP_EDP0 {
+		reg = <ROCKCHIP_VOP2_EP_EDP0>;
+		remote-endpoint = <&edp0_in_vp2>;
+	};
+};
-- 
2.47.2