shields: display: Added generic shield for ST7789V

Added a generic display shield for boards based on the ST7789V
display controller.

Signed-off-by: Jan Van Winkel <[email protected]>

Author: vanwinkeljan

boards/shields/st7789v_generic/doc/index.rst

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+.. _st7789v_generic:
+
+Generic ST7789V Display Shield
+##############################
+
+Overview
+********
+
+This is a generic shield for display shields based on ST7789V display
+controller. More information about the controller can be found in
+`ST7789V Datasheet`_.
+
+Pins Assignment of the Generic ST7789V Display Shield
+=====================================================
+
++-----------------------+---------------------------------------------+
+| Arduino Connector Pin | Function                                    |
++=======================+=============================================+
+| D8                    | ST7789V Reset                               |
++-----------------------+---------------------------------------------+
+| D9                    | ST7789V DC       (Data/Command)             |
++-----------------------+---------------------------------------------+
+| D10                   | SPI SS           (Serial Slave Select)      |
++-----------------------+---------------------------------------------+
+| D11                   | SPI MOSI         (Serial Data Input)        |
++-----------------------+---------------------------------------------+
+| D12                   | SPI MISO         (Serial Data Out)          |
++-----------------------+---------------------------------------------+
+| D13                   | SPI SCK          (Serial Clock Input)       |
++-----------------------+---------------------------------------------+
+
+Requirements
+************
+
+This shield can only be used with a board that provides a configuration
+for Arduino connectors and defines node aliases for SPI and GPIO interfaces
+(see :ref:`shields` for more details).
+
+Programming
+***********
+
+Set ``-DSHIELD=st7789v_generic`` when you invoke ``west build``. For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/gui/lvgl
+   :board: nrf52840_pca10056
+   :shield: st7789v_generic
+   :goals: build
+
+References
+**********
+
+.. target-notes::
+
+.. _ST7789V Datasheet:
+   https://www.newhavendisplay.com/appnotes/datasheets/LCDs/ST7789V.pdf
+

boards/shields/st7789v_generic/st7789v_generic.conf

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+CONFIG_SPI=y
+CONFIG_DISPLAY=y
+CONFIG_ST7789V=y
+
+CONFIG_ST7789V_RGB888=y
+CONFIG_LVGL_BITS_PER_PIXEL=24
+CONFIG_LVGL_HOR_RES=320
+CONFIG_LVGL_VER_RES=170
+
+CONFIG_LVGL_DISPLAY_DEV_NAME="ST7789V"

boards/shields/st7789v_generic/st7789v_generic.overlay

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+/*
+ * Copyright (c) 2019 Jan Van Winkel <[email protected]>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&arduino_spi {
+	status = "okay";
+	cs-gpios = <&arduino_header 16 0>;	/* D10 */
+
+	st7789v@0 {
+		compatible = "sitronix,st7789v";
+		label = "ST7789V";
+		spi-max-frequency = <20000000>;
+		reg = <0>;
+		cmd-data-gpios = <&arduino_header 15 0>;	/* D9 */
+		reset-gpios = <&arduino_header 14 0>;	/* D8 */
+		width = <320>;
+		height = <170>;
+		y-offset = <35>;
+	};
+};