arm64:dts:pconxs: Adapt touch, backlight and display enable

arch/arm64/boot/dts/seconorth/pconxs.dtsi

@@ -185,23 +185,19 @@ &pwm1 {
 	status = "okay";
 };
 
-&backlight1{
-	status = "okay";
-	pinctrl-0 = <&pinctrl_backlight_enable>;
-	enable-gpios = <spin73_gpio GPIO_ACTIVE_HIGH>;    
-	brightness-levels = < 100 
-				99 98 97 96 95 94 93 92 91 90
-				89 88 87 86 85 84 83 82 81 80
-				79 78 77 76 75 74 73 72 71 70
-				69 68 67 66 65 64 63 62 61 60
-				59 58 57 56 55 54 53 52 51 50
-				49 48 47 46 45 44 43 42 41 40
-				39 38 37 36 35 34 33 32 31 30
-				29 28 27 26 25 24 23 22 21 20
-				19 18 17 16 15 14 13 12 11 10
-				 9  8  7  6  5  4  3  2  1  0>;    
-};
+/*
+  The backlight is provided by the SOM, so it should be defined in the SOM's
+  DTSI file. If a display needs reversed brightness levels, this should be
+  overridden by the display's DTSI file.
+*/
 
+/*
+  The touch is part of the display, not the baseboard.
+  But if a touch is present, some configurations are almost the same,
+  at least when the pins to be used are defined somewhere else.
+  Furthermore to move the touch definition to the display will break
+  lots of existing device trees (believe me, I tried to do so).
+*/
 #ifdef TOUCH_INT
 i2c_touch: &i2c1 { /* Touch */
 	clock-frequency = <400000>;
@@ -213,9 +209,7 @@ cap_touch: cap_touch_controller@0{
 		interrupt-parent = <touch_int_parent>;
 		interrupts = <touch_int_pin IRQ_TYPE_LEVEL_LOW>;
 		irq-gpio = <touch_int GPIO_ACTIVE_LOW>;
-	#ifdef TRIZEPS8MINI // on plus the reset is not connected
 		reset-gpio = <touch_enable GPIO_ACTIVE_LOW>;
-	#endif
 
 		status = "disabled";
 	};
@@ -300,6 +294,8 @@ &gpio1 10 (KK_RSRVD_IN    |KK_RSRVD_EXPORT|KK_RSRVD_REQUEST(2)) /* CAN1_TX */
 };
 #endif
 
+// the touch is part of the display, not the baseboard
+#if 0
 &iomuxc {
 
 #ifdef DISPLAY_ENABLE
@@ -308,6 +304,31 @@ pinctrl_display_enable: display-enable 	{
 	};
 #endif
 
+#ifdef TOUCH_INT
+	pinctrl_captouch: captouchgrp {
+		fsl,pins = <
+	#ifdef TRIZEPS8MINI // on plus the reset is not connected
+			// yes it is, but is is a mcu-gpio
+				 TOUCH_RESET	PAD_GPIO /* WAKE */
+	#endif
+#if defined(TOUCH_USE_INT2) && (TOUCH_USE_INT2==1)
+				 TOUCH_INT2 	PAD_GPIO /* IRQ */
+#else
+				 TOUCH_INT  	PAD_GPIO /* IRQ */
+#endif
+			TOUCH_INT	PAD_GPIO
+		>;
+	};
+#endif
+
+};
+#else
+&iomuxc {
+#ifdef DISPLAY_ENABLE
+	pinctrl_display_enable: display-enable 	{
+		fsl,pins = < DISPLAY_ENABLE		PAD_GPIO_PU >; /* DISPLAY_ENABLE */
+	};
+#endif
 #ifdef TOUCH_INT
 	pinctrl_captouch: captouchgrp {
 		fsl,pins = <
@@ -320,6 +341,8 @@ TOUCH_INT	PAD_GPIO
 		>;
 	};
 #endif
-
 };
+
+#endif
+
 #endif