shields: Add a GDEW042T2 with fast partial refresh

Add GoodDisplay GDEW042T2 with fast partial refresh. Based on
configuration from GoodDisplay's Arduino example.

Signed-off-by: Andreas Sandberg <[email protected]>

Author: andysan

boards/shields/waveshare_epaper/Kconfig.defconfig

@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-if SHIELD_WAVESHARE_EPAPER_GDEH029A1 || SHIELD_WAVESHARE_EPAPER_GDEH0213B1 || SHIELD_WAVESHARE_EPAPER_GDEH0213B72 || SHIELD_WAVESHARE_EPAPER_GDEW075T7 || SHIELD_WAVESHARE_EPAPER_GDEH0154A07 || SHIELD_WAVESHARE_EPAPER_GDEW042T2
+if SHIELD_WAVESHARE_EPAPER_GDEH029A1 || SHIELD_WAVESHARE_EPAPER_GDEH0213B1 || SHIELD_WAVESHARE_EPAPER_GDEH0213B72 || SHIELD_WAVESHARE_EPAPER_GDEW075T7 || SHIELD_WAVESHARE_EPAPER_GDEH0154A07 || SHIELD_WAVESHARE_EPAPER_GDEW042T2 || SHIELD_WAVESHARE_EPAPER_GDEW042T2_P
 
 
 if DISPLAY

boards/shields/waveshare_epaper/Kconfig.shield

@@ -18,3 +18,6 @@ config SHIELD_WAVESHARE_EPAPER_GDEH0154A07
 
 config SHIELD_WAVESHARE_EPAPER_GDEW042T2
 	def_bool $(shields_list_contains,waveshare_epaper_gdew042t2)
+
+config SHIELD_WAVESHARE_EPAPER_GDEW042T2_P
+	def_bool $(shields_list_contains,waveshare_epaper_gdew042t2-p)

boards/shields/waveshare_epaper/doc/index.rst

@@ -63,7 +63,7 @@ Current supported displays
 | GDEH0154D67  |                 | ssd16xx      |                              |
 +--------------+-----------------+--------------+------------------------------+
 | Good Display | WFT0420CZ15     | UC8176 /     | waveshare_epaper_gdew042t2   |
-| GDEW042T2    |                 | gd7965       |                              |
+| GDEW042T2    |                 | gd7965       | waveshare_epaper_gdew042t2-p |
 +--------------+-----------------+--------------+------------------------------+
 
 

boards/shields/waveshare_epaper/waveshare_epaper_gdew042t2-p.overlay

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2022 Andreas Sandberg
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "waveshare_epaper_common.dtsi"
+
+/ {
+	chosen {
+		zephyr,display = &uc8176;
+	};
+};
+
+&arduino_spi {
+	/*
+	 * GoodDisplay GDEW042T2 with fast partial refresh. Based on
+	 * configuration from GoodDisplay's Arduino example.
+	 */
+	uc8176: uc8176@0 {
+		compatible = "gooddisplay,gdew042t2", "ultrachip,uc8176";
+		spi-max-frequency = <4000000>;
+		reg = <0>;
+		width = <400>;
+		height = <300>;
+		dc-gpios = <&arduino_header 15 GPIO_ACTIVE_LOW>;	/* D9 */
+		reset-gpios = <&arduino_header 14 GPIO_ACTIVE_LOW>;	/* D8 */
+		busy-gpios = <&arduino_header 13 GPIO_ACTIVE_LOW>;	/* D7 */
+
+		softstart = [ 17 17 17 ];
+
+		full {
+			cdi = <0x07>;
+		};
+
+		partial {
+			pwr = [ 03 02 2b 2b ];
+			cdi = <0x07>;
+			pll = <0x3c>;
+			vdcs = <0x08>;
+
+			lutc = [
+				00 01 0E 00 00 01
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00
+			];
+
+			lutww = [
+				00 01 0E 00 00 01
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+			];
+
+			lutkw = [
+				20 01 0E 00 00 01
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+			];
+
+			lutwk = [
+				10 01 0E 00 00 01
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+			];
+
+			lutkk = [
+				00 01 0E 00 00 01
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+				00 00 00 00 00 00
+			];
+		};
+	};
+};