BCM270X_DT: Add PaPiRus overlay

Add Device Tree overlay for the PaPiRus ePaper Screens by Pi Supply.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

arch/arm/boot/dts/overlays/Makefile

@@ -64,6 +64,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
 	mmc.dtbo \
 	mpu6050.dtbo \
 	mz61581.dtbo \
+	papirus.dtbo \
 	pi3-act-led.dtbo \
 	pi3-disable-bt.dtbo \
 	pi3-disable-wifi.dtbo \

arch/arm/boot/dts/overlays/README

@@ -1001,6 +1001,17 @@ Params: speed                   Display SPI bus speed
         xohms                   Touchpanel sensitivity (X-plate resistance)
 
 
+Name:   papirus
+Info:   PaPiRus ePaper Screen by Pi Supply (both HAT and pHAT)
+Load:   dtoverlay=papirus,model=<val>
+Params: model                   Display panel (required):
+                                1.44": e1144cs021
+                                2.0":  e2200cs021
+                                2.7":  e2271cs021
+
+        speed                   Display SPI bus speed
+
+
 [ The pcf2127-rtc overlay has been deleted. See i2c-rtc. ]
 
 

arch/arm/boot/dts/overlays/papirus-overlay.dts

@@ -0,0 +1,89 @@
+/* PaPiRus ePaper Screen by Pi Supply */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "brcm,bcm2708";
+
+	fragment@0 {
+		target = <&i2c_arm>;
+		__overlay__ {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "okay";
+
+			display_temp: lm75@48 {
+				compatible = "lm75b";
+				reg = <0x48>;
+				status = "okay";
+				#thermal-sensor-cells = <0>;
+			};
+		};
+	};
+
+	fragment@1 {
+		target-path = "/";
+		__overlay__ {
+			thermal-zones {
+				display {
+					polling-delay-passive = <0>;
+					polling-delay = <0>;
+					thermal-sensors = <&display_temp>;
+				};
+			};
+		};
+	};
+
+	fragment@2 {
+		target = <&spi0>;
+		__overlay__ {
+			status = "okay";
+
+			spidev@0{
+				status = "disabled";
+			};
+		};
+	};
+
+	fragment@3 {
+		target = <&gpio>;
+		__overlay__ {
+			repaper_pins: repaper_pins {
+				brcm,pins = <14 15 23 24 25>;
+				brcm,function = <1 1 1 1 0>; /* out out out out in */
+			};
+		};
+	};
+
+	fragment@4 {
+		target = <&spi0>;
+		__overlay__ {
+			/* needed to avoid dtc warning */
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			repaper: repaper@0{
+				compatible = "not_set";
+				reg = <0>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&repaper_pins>;
+
+				spi-max-frequency = <8000000>;
+
+				panel-on-gpios = <&gpio 23 0>;
+				border-gpios = <&gpio 14 0>;
+				discharge-gpios = <&gpio 15 0>;
+				reset-gpios = <&gpio 24 0>;
+				busy-gpios = <&gpio 25 0>;
+
+				repaper-thermal-zone = "display";
+			};
+		};
+	};
+
+	__overrides__ {
+		model = <&repaper>, "compatible";
+		speed = <&repaper>, "spi-max-frequency:0";
+	};
+};