[SANTINO][OVERLAY] Add 800x480 LCD and touch screen

LCD:
Add reg-userspace-consumer to let the user handle the LCD panel.

Test procedure:
i) switch off the panel:
```
echo "disabled" > /sys/class/regulator/regulator.7/reg_rgb_panel_on_consumer-rgb_panel_on/state
echo 0 > /sys/class/backlight/backlight/brightness
```
ii) switch on the panel:
```
echo 255 > /sys/class/backlight/backlight/brightness
echo "enabled" > /sys/class/regulator/regulator.7/reg_rgb_panel_on_consumer-rgb_panel_on/state
```

TOUCH:
Calibration needed at OS level. For weston:
```
weston-touch-calibrator /dev/fb0
```

JIRA Reference: [SANTINO-19]

arch/arm/boot/dts/seco/overlays/Makefile

@@ -37,7 +37,8 @@ dtbo-$(CONFIG_SOC_IMX6Q) += \
 	seco-imx6qdl-a75-video-lvds-hdmi.dtbo \
 	seco-imx6qdl-a75-video-lvds.dtbo \
 	seco-imx6qdl-a75-video-lvdsx2-clone.dtbo \
-	seco-imx6qdl-a75-video-lvdsx2-dual.dtbo
+	seco-imx6qdl-a75-video-lvdsx2-dual.dtbo \
+	seco-imx6dl-santino-video-rgb-touch-ad7879.dtbo
 	
 
 dtbo-$(CONFIG_SOC_IMX6SX) += \

arch/arm/boot/dts/seco/overlays/seco-imx6dl-santino-video-rgb-touch-ad7879-overlay.dts

+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/display/media-bus-format.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+
+    fragment@0 {
+        target = <&mxcfb1>;
+        __overlay__ {
+            status = "okay";
+        };
+    };
+
+    fragment@1 {
+        target-path = "/";
+
+        __overlay__ {
+            // FANNAL, FN0700D083A
+            lcd@0 {
+                compatible = "fsl,lcd";
+                ipu_id = <0>;
+                disp_id = <0>;
+                default_ifmt = "RGB666";
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_ipu1_lcdif18bpp>;
+                status = "okay";
+            };
+
+            // Do not add a label to the backlight node. Due to the driver,
+            // the label causes functional failures
+            backlight {
+                compatible = "pwm-backlight";
+                power-supply = <&reg_5P0>;
+                pwms = <&pwm1 0 50000 0>;
+                brightness-levels = <0x0000 0x0281 0x06E1 0x0E56 0x1B0D 0x30B8 0x55A9 0x94A0 0xFFFF>;
+                num-interpolated-steps = <32>;
+                default-brightness-level = <0x94A0>;
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_bl_on1>;
+                enable-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>;
+                status = "okay";
+            };
+
+            reg_rgb_panel_on: reg_rgb_panel_on {
+                compatible              = "regulator-fixed";
+                regulator-name          = "rgb_panel_on";
+                regulator-min-microvolt = <3300000>;
+                regulator-max-microvolt = <3300000>;
+                gpio                    = <&gpio5 21 GPIO_ACTIVE_HIGH>;
+                enable-active-high;
+                regulator-boot-on;
+            };
+
+            // The properties:
+            // power-supply = <&reg_rgb_panel_on>
+            // vcc-supply = <&reg_rgb_panel_on>
+            // have been tested in the lcd@0 node but no consumer is detected
+            // and the regulator is switched-off after a while.
+            // This consumer has been added to let the user enable/disable the
+            // display from the userspace, overcoming the described issue.
+            reg_rgb_panel_on_consumer {
+                compatible = "reg-userspace-consumer";
+                regulator-name = "LCD_ENA";
+                regulator-boot-on;
+                regulator-supplies = "rgb_panel_on";
+                rgb_panel_on-supply = <&reg_rgb_panel_on>;
+            };
+        };
+    };
+
+    fragment@2 {
+        target = <&i2c3>;
+
+        __overlay__ {
+            #address-cells = <1>;
+            #size-cells = <0>;
+            ad7879@2c {
+                adi,conversion-interval = /bits/ 8 <255>;
+                adi,averaging = /bits/ 8 <1>;
+                adi,median-filter-size = /bits/ 8 <2>;
+                adi,acquisition-time = /bits/ 8 <1>;
+                adi,first-conversion-delay = /bits/ 8 <3>;
+                adi,resistance-plate-x = <120>;
+                touchscreen-max-pressure = <4096>;
+                status = "okay";
+                interrupt-parent = <&gpio4>;
+                interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
+                pinctrl-0 = <&pinctrl_rtouch_int2>;
+                pinctrl-names = "default";
+                compatible = "adi,ad7879-1";
+                reg = <0x2c>;
+            };
+        };
+    };
+
+    fragment@3 {
+        target-path = "/";
+
+        __overlay__ {
+            serial-number = "03879390";
+        };
+    };
+
+    fragment@4 {
+        target = <&fec>;
+
+        __overlay__ {
+            local-mac-address = [00 07 8e 3b 31 de];
+        };
+    };
+
+    fragment@5 {
+        target = <&spreadspectrum>;
+
+        __overlay__ {
+            enabled = <1>;
+            denom = <400>;
+            stop = <241>;
+            step = <1>;
+        };
+    };
+};

arch/arm/boot/dts/seco/seco-imx6dl-santino.dtsi

@@ -18,47 +18,19 @@
 		reg = <0x10000000 0x20000000>;
 	};
 
-	lcd_display: disp0 {
-		compatible = "fsl,imx-parallel-display";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		interface-pix-fmt = "rgb666";
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_ipu1_lcdif18bpp>;
-		status = "okay";
-
-		port@0 {
-			reg = <0>;
-
-			lcd_display_in: endpoint {
-				remote-endpoint = <&ipu1_di0_disp0>;
-			};
-		};
-
-		port@1 {
-			reg = <1>;
-
-			lcd_display_out: endpoint {
-				remote-endpoint = <&lcd_panel_in>;
-			};
-		};
+	aliases {
+		mxcfb0 = &mxcfb1;
 	};
 
-	panel: panel {
-		compatible = "guf,panel-dt";
-		backlight = <&backlight>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_lcd_enable1>;
-		power-supply = <&reg_SW4_3V3>;
-
-		enable-gpios = <&gpio5 21 GPIO_ACTIVE_HIGH>;
-		status = "okay";
-
-		port {
-			lcd_panel_in: endpoint {
-				remote-endpoint = <&lcd_display_out>;
-			};
-		};
+	mxcfb1: fb@0 {
+		compatible = "fsl,mxc_sdc_fb";
+		disp_dev = "lcd";
+		interface_pix_fmt = "RGB666";
+		mode_str ="CLAA-WVGA";
+		default_bpp = <16>;
+		int_clk = <0>;
+		late_init = <0>;
+		status = "disabled";
 	};
 
 	reg_5P0_CAN_RS485: regulator_5P0_CAN_RS485 {
@@ -82,13 +54,6 @@
 	};
 };
 
-&backlight {
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_bl_on1>;
-	enable-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>;
-	status = "okay";
-};
-
 &can1 {
 	xceiver-supply = <&reg_5P0_CAN_RS485>;
 };
@@ -183,10 +148,6 @@
 	status = "disabled";
 };
 
-&ipu1_di0_disp0 {
-	remote-endpoint = <&lcd_display_in>;
-};
-
 &lm75 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lm75_1>;

arch/arm/boot/dts/seco/seco-imx6qdl-san.dtsi

@@ -110,16 +110,6 @@
 		assigned-clock-rates = <12000000>, <12000000>, <12000000>;
 	};
 
-	backlight: backlight {
-		compatible = "pwm-backlight";
-		power-supply = <&reg_5P0>;
-		pwms = <&pwm1 0 50000 0>;
-		brightness-levels = <0x0000 0x0281 0x06E1 0x0E56 0x1B0D 0x30B8 0x55A9 0x94A0 0xFFFF>;
-		num-interpolated-steps = <32>;
-		default-brightness-level = <0x94A0>;
-		status = "okay";
-	};
-
 	gfplatdetect: gfplatdetect {
 		compatible = "guf,imx6q-platdetect";
 		pinctrl-names = "default";

arch/arm/configs/seco_imx6_linux_defconfig

@@ -287,6 +287,7 @@ CONFIG_MFD_SI476X_CORE=y
 CONFIG_MFD_STMPE=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
+CONFIG_REGULATOR_USERSPACE_CONSUMER=y
 CONFIG_REGULATOR_ANATOP=y
 CONFIG_REGULATOR_DA9052=y
 CONFIG_REGULATOR_DA9062=y