From 86356a59b7688f8080aab516f1723f2ffbf15090 Mon Sep 17 00:00:00 2001
From: Mark Williams <mwp@mwp.id.au>
Date: Thu, 8 Dec 2022 04:58:05 -0700
Subject: [PATCH] overlays: Add crystalfontz-cfa050_pi_m

Add support for the Crystalfontz CFA050-PI-M series of Raspberry Pi
CM4-based modules using the CFAF7201280A0_050Tx TFT LCD displays.

Signed-off-by: Mark Williams <mwp@mwp.id.au>
---
 arch/arm/boot/dts/overlays/Makefile           |   1 +
 arch/arm/boot/dts/overlays/README             |   9 ++
 .../crystalfontz-cfa050_pi_m-overlay.dts      | 124 ++++++++++++++++++
 3 files changed, 134 insertions(+)
 create mode 100644 arch/arm/boot/dts/overlays/crystalfontz-cfa050_pi_m-overlay.dts

--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -40,6 +40,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	chipdip-dac.dtbo \
 	cirrus-wm5102.dtbo \
 	cma.dtbo \
+	crystalfontz-cfa050_pi_m.dtbo \
 	cutiepi-panel.dtbo \
 	dacberry400.dtbo \
 	dht11.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -804,6 +804,15 @@ Params: cma-512                 CMA is 5
         cma-default             Use upstream's default value
 
 
+Name:   crystalfontz-cfa050_pi_m
+Info:   Configures the Crystalfontz CFA050-PI-M series of Raspberry Pi CM4
+        based modules using the CFA7201280A0_050Tx 7" TFT LCD displays,
+        with or without capacitive touch screen.
+        Requires use of vc4-kms-v3d.
+Load:   dtoverlay=crystalfontz-cfa050_pi_m,<param>=<val>
+Params: captouch                Enable capacitive touch display
+
+
 Name:   cutiepi-panel
 Info:   8" TFT LCD display and touch panel used by cutiepi.io
 Load:   dtoverlay=cutiepi-panel
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/crystalfontz-cfa050_pi_m-overlay.dts
@@ -0,0 +1,124 @@
+/*
+ * crystalfontz-cfa050_pi_m-overlay.dts
+ * Configures the Crystalfontz CFA050-PI-M series of modules
+ * using CFAF7201280A0-050TC/TN panels with RaspberryPi CM4 DSI1
+ */
+/dts-v1/;
+/plugin/;
+/{
+// RaspberryPi CM4
+	compatible = "brcm,bcm2835";
+// PCF8574 I2C GPIO EXPANDER
+	fragment@0 {
+		target = <&i2c_csi_dsi>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			pcf8574a: pcf8574a@38 {
+				reg = <0x38>;
+				compatible = "nxp,pcf8574";
+				gpio-controller;
+				#gpio-cells = <2>;
+				ngpios = <8>;
+				gpio-line-names = "TFT_RESET", "TOUCH_RESET", "EXT_P2", "EXT_P3",
+					"EXT_P4", "EXT_P5", "EXT_P6", "EXT_P7";
+			};
+		};
+	};
+// LM3630a BACKLIGHT LED CONTROLLER
+	fragment@1 {
+		target = <&i2c_csi_dsi>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			lm3630a: backlight@36 {
+				reg = <0x36>;
+				compatible = "ti,lm3630a";
+				#address-cells = <1>;
+				#size-cells = <0>;
+				led@0 {
+					reg = <0>;
+					led-sources = <0 1>;
+					label = "lcd-backlight";
+					default-brightness = <128>;
+					max-brightness = <255>;
+				};
+			};
+		};
+	};
+// CFAF7201280A0_050Tx TFT DSI PANEL
+	fragment@2 {
+		target = <&dsi1>;
+		__overlay__  {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			port {
+				dsi_out: endpoint {
+					remote-endpoint = <&panel_in>;
+				};
+			};
+			dsi_panel: dsi_panel@0 {
+				compatible = "crystalfontz,cfaf7201280a0_050tx";
+				reg = <0>;
+				reset-gpios = <&pcf8574a 0 1>;
+				backlight = <&lm3630a>;
+				fps = <60>;
+				port {
+					panel_in: endpoint {
+						remote-endpoint = <&dsi_out>;
+					};
+				};
+			};
+		};
+	};
+// rPI GPIO INPUT FOR TOUCH IC IRQ
+	fragment@3 {
+		target = <&gpio>;
+		__dormant__ {
+			gt928intpins: gt928intpins {
+				brcm,pins = <26>;
+				brcm,function = <0>;
+				brcm,pull = <1>;
+			};
+		};
+	};
+// GT928 TOUCH CONTROLLER IC
+	fragment@4 {
+		target = <&i2c_csi_dsi>;
+		__dormant__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			gt928@5d {
+				compatible = "goodix,gt928";
+				reg = <0x5d>;
+				interrupt-parent = <&gpio>;
+				interrupts = <26 2>;
+				irq-gpios = <&gpio 26 0>;
+				reset-gpios = <&pcf8574a 1 1>;
+				touchscreen-inverted-x;
+				touchscreen-inverted-y;
+			};
+		};
+	};
+// PCF85063A RTC on I2C
+	fragment@5 {
+		target = <&i2c_csi_dsi>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+			pcf85063a@51 {
+				compatible = "nxp,pcf85063a";
+				reg = <0x51>;
+			};
+		};
+	};
+// CAPACITIVE TOUCH OPTION FOR TFT PANEL
+	__overrides__ {
+		captouch = <0>,"+3+4";
+	};
+};