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-DT bindings for the Hitachi HD44780 Character LCD Controller
-
-The Hitachi HD44780 Character LCD Controller is commonly used on character LCDs
-that can display one or more lines of text. It exposes an M6800 bus interface,
-which can be used in either 4-bit or 8-bit mode.
-
-Required properties:
- - compatible: Must contain "hit,hd44780",
- - data-gpios: Must contain an array of either 4 or 8 GPIO specifiers,
- referring to the GPIO pins connected to the data signal lines DB0-DB7
- (8-bit mode) or DB4-DB7 (4-bit mode) of the LCD Controller's bus interface,
- - enable-gpios: Must contain a GPIO specifier, referring to the GPIO pin
- connected to the "E" (Enable) signal line of the LCD Controller's bus
- interface,
- - rs-gpios: Must contain a GPIO specifier, referring to the GPIO pin
- connected to the "RS" (Register Select) signal line of the LCD Controller's
- bus interface,
- - display-height-chars: Height of the display, in character cells,
- - display-width-chars: Width of the display, in character cells.
-
-Optional properties:
- - rw-gpios: Must contain a GPIO specifier, referring to the GPIO pin
- connected to the "RW" (Read/Write) signal line of the LCD Controller's bus
- interface,
- - backlight-gpios: Must contain a GPIO specifier, referring to the GPIO pin
- used for enabling the LCD's backlight,
- - internal-buffer-width: Internal buffer width (default is 40 for displays
- with 1 or 2 lines, and display-width-chars for displays with more than 2
- lines).
-
-Example:
-
- auxdisplay {
- compatible = "hit,hd44780";
-
- data-gpios = <&hc595 0 GPIO_ACTIVE_HIGH>,
- <&hc595 1 GPIO_ACTIVE_HIGH>,
- <&hc595 2 GPIO_ACTIVE_HIGH>,
- <&hc595 3 GPIO_ACTIVE_HIGH>;
- enable-gpios = <&hc595 4 GPIO_ACTIVE_HIGH>;
- rs-gpios = <&hc595 5 GPIO_ACTIVE_HIGH>;
-
- display-height-chars = <2>;
- display-width-chars = <16>;
- };