[PATCH v6] arch: arm64: dts: sm8650-hdk: add support for the Display Card overlay

[Neil Armstrong]

With the SM8650-HDK, a Display Card kit can be connected to provide
a VTDR6130 display with Goodix Berlin Touch controller.

In order to route the DSI lanes to the connector for the Display
Card kit, a switch must be changed on the board.

The HDMI nodes are disabled since the DSI lanes are shared with
the DSI to HDMI transceiver.

Add support for this card as an overlay and apply it it at
build-time to the sm8650-hdk dtb.

Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@xxxxxxxxxx>
Tested-by: Vladimir Zapolskiy <vladimir.zapolskiy@xxxxxxxxxx>
Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
---
The SM8650-HDK is an embedded development platforms for the
Snapdragon 8 Gen 3 SoC aka SM8650, with the following features:
- Qualcomm SM8650 SoC
- 16GiB On-board LPDDR5
- On-board WiFi 7 + Bluetooth 5.3/BLE
- On-board UFS4.0
- M.2 Key B+M Gen3x2 PCIe Slot
- HDMI Output
- USB-C Connector with DP Almode & Audio Accessory mode
- Micro-SDCard Slot
- Audio Jack with Playback and Microphone
- 2 On-board Analog microphones
- 2 On-board Speakers
- 96Boards Compatible Low-Speed and High-Speed connectors [1]
- For Camera, Sensors and external Display cards
- Compatible with the Linaro Debug board [2]
- SIM Slot for Modem
- Debug connectors
- 6x On-Board LEDs

An optional Display Card kit can be connected on top,
an overlay is handled to add support for the DSI Display
and Touch Controller.

Product Page: [3]

Dependencies: None

[1] https://www.96boards.org/specifications/
[2] https://git.codelinaro.org/linaro/qcomlt/debugboard
[3] https://www.lantronix.com/products/snapdragon-8-gen-3-mobile-hardware-development-kit/

To: Bjorn Andersson <andersson@xxxxxxxxxx>
To: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
To: Rob Herring <robh@xxxxxxxxxx>
To: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
To: Conor Dooley <conor+dt@xxxxxxxxxx>
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>

Changes in v6:
- added comment explaining why we disable nodes
- removed useles comment on why we add the port/endpoint/address/size-cells
- added Konrad's review
- Link to v5: https://lore.kernel.org/r/20240606-topic-sm8650-upstream-hdk-v5-1-5d878f3047e3@xxxxxxxxxx

Changes in v5:
- Resend the display card overlay now the I2C crash is fixed
- Link to v4: https://lore.kernel.org/r/20240422-topic-sm8650-upstream-hdk-v4-0-b33993eaa2e8@xxxxxxxxxx

Changes in v4:
- Rebased on next and fixed the apply failures
- Link to v3: https://lore.kernel.org/r/20240325-topic-sm8650-upstream-hdk-v3-0-4f365d7932af@xxxxxxxxxx

Changes in v3:
- fixed regulator node name to fix ordering
- deleted pcie_1_phy_aux clock
- removed undeeded mdss_mdp status okay
- collected revied & tested tags
- Link to v2: https://lore.kernel.org/r/20240318-topic-sm8650-upstream-hdk-v2-0-b63a5d45a784@xxxxxxxxxx

Changes in v2:
- Fixed commit messages with links, and recently added product page URL
- Swapped i2c3/i2c6 nodes
- Moved pcie_1_phy_aux_clk under pcie1_phy
- Removed duplicate mdp_vsync pinctrl state
- Collected review & tested tags
- Link to v1: https://lore.kernel.org/r/20240223-topic-sm8650-upstream-hdk-v1-0-ccca645cd901@xxxxxxxxxx
---
 arch/arm64/boot/dts/qcom/Makefile                  |   4 +
 .../boot/dts/qcom/sm8650-hdk-display-card.dtso     | 141 +++++++++++++++++++++
 2 files changed, 145 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 56992fc3fc59..0c1cebd16649 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -250,6 +250,10 @@ dtb-$(CONFIG_ARCH_QCOM)	+= sm8550-mtp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8550-qrd.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8550-samsung-q5q.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8550-sony-xperia-yodo-pdx234.dtb
+
+sm8650-hdk-display-card-dtbs	:= sm8650-hdk.dtb sm8650-hdk-display-card.dtbo
+
+dtb-$(CONFIG_ARCH_QCOM)	+= sm8650-hdk-display-card.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8650-hdk.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8650-mtp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8650-qrd.dtb
diff --git a/arch/arm64/boot/dts/qcom/sm8650-hdk-display-card.dtso b/arch/arm64/boot/dts/qcom/sm8650-hdk-display-card.dtso
new file mode 100644
index 000000000000..cb102535838d
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/sm8650-hdk-display-card.dtso
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2024, Linaro Limited
+ */
+
+/*
+ * Display Card kit overlay
+ * This requires S5702 Switch 7 to be turned to OFF to route DSI0 to the display panel
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/dts-v1/;
+/plugin/;
+
+/* Disable HDMI bridge related nodes (mutually exclusive with the display card) */
+
+&i2c6 {
+	status = "disabled";
+};
+
+&lt9611_1v2 {
+	status = "disabled";
+};
+
+&lt9611_3v3 {
+	status = "disabled";
+};
+
+&vreg_bob_3v3 {
+	status = "disabled";
+};
+
+&lt9611_codec {
+	status = "disabled";
+};
+
+&mdss_dsi0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	panel@0 {
+		compatible = "visionox,vtdr6130";
+		reg = <0>;
+
+		reset-gpios = <&tlmm 133 GPIO_ACTIVE_LOW>;
+
+		vddio-supply = <&vreg_l12b_1p8>;
+		vci-supply = <&vreg_l13b_3p0>;
+		vdd-supply = <&vreg_l11b_1p2>;
+
+		pinctrl-0 = <&disp0_reset_n_active>, <&mdp_vsync>;
+		pinctrl-1 = <&disp0_reset_n_suspend>, <&mdp_vsync>;
+		pinctrl-names = "default", "sleep";
+
+		port {
+			panel0_in: endpoint {
+				remote-endpoint = <&mdss_dsi0_out>;
+			};
+		};
+	};
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@1 {
+			reg = <1>;
+
+			mdss_dsi0_out: endpoint {
+				remote-endpoint = <&panel0_in>;
+			};
+		};
+	};
+};
+
+&spi4 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	status = "okay";
+
+	touchscreen@0 {
+		compatible = "goodix,gt9916";
+		reg = <0>;
+
+		interrupt-parent = <&tlmm>;
+		interrupts = <162 IRQ_TYPE_LEVEL_LOW>;
+
+		reset-gpios = <&tlmm 161 GPIO_ACTIVE_LOW>;
+
+		avdd-supply = <&vreg_l14b_3p2>;
+
+		spi-max-frequency = <1000000>;
+
+		touchscreen-size-x = <1080>;
+		touchscreen-size-y = <2400>;
+
+		pinctrl-0 = <&ts_irq>, <&ts_reset>;
+		pinctrl-names = "default";
+	};
+};
+
+&tlmm {
+	disp0_reset_n_active: disp0-reset-n-active-state {
+		pins = "gpio133";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-disable;
+	};
+
+	disp0_reset_n_suspend: disp0-reset-n-suspend-state {
+		pins = "gpio133";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-pull-down;
+	};
+
+	mdp_vsync: mdp-vsync-state {
+		pins = "gpio86";
+		function = "mdp_vsync";
+		drive-strength = <2>;
+		bias-pull-down;
+	};
+
+	ts_irq: ts-irq-state {
+		pins = "gpio161";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-pull-up;
+		output-disable;
+	};
+
+	ts_reset: ts-reset-state {
+		pins = "gpio162";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-pull-up;
+	};
+};

---
base-commit: 234cb065ad82915ff8d06ce01e01c3e640b674d2
change-id: 20240223-topic-sm8650-upstream-hdk-e21cfd6f1de8

Best regards,
-- 
Neil Armstrong <neil.armstrong@xxxxxxxxxx>