1DT bindings for the Hitachi HD44780 Character LCD Controller 2 3The Hitachi HD44780 Character LCD Controller is commonly used on character LCDs 4that can display one or more lines of text. It exposes an M6800 bus interface, 5which can be used in either 4-bit or 8-bit mode. 6 7Required properties: 8 - compatible: Must contain "hit,hd44780", 9 - data-gpios: Must contain an array of either 4 or 8 GPIO specifiers, 10 referring to the GPIO pins connected to the data signal lines DB0-DB7 11 (8-bit mode) or DB4-DB7 (4-bit mode) of the LCD Controller's bus interface, 12 - enable-gpios: Must contain a GPIO specifier, referring to the GPIO pin 13 connected to the "E" (Enable) signal line of the LCD Controller's bus 14 interface, 15 - rs-gpios: Must contain a GPIO specifier, referring to the GPIO pin 16 connected to the "RS" (Register Select) signal line of the LCD Controller's 17 bus interface, 18 - display-height-chars: Height of the display, in character cells, 19 - display-width-chars: Width of the display, in character cells. 20 21Optional properties: 22 - rw-gpios: Must contain a GPIO specifier, referring to the GPIO pin 23 connected to the "RW" (Read/Write) signal line of the LCD Controller's bus 24 interface, 25 - backlight-gpios: Must contain a GPIO specifier, referring to the GPIO pin 26 used for enabling the LCD's backlight, 27 - internal-buffer-width: Internal buffer width (default is 40 for displays 28 with 1 or 2 lines, and display-width-chars for displays with more than 2 29 lines). 30 31Example: 32 33 auxdisplay { 34 compatible = "hit,hd44780"; 35 36 data-gpios = <&hc595 0 GPIO_ACTIVE_HIGH>, 37 <&hc595 1 GPIO_ACTIVE_HIGH>, 38 <&hc595 2 GPIO_ACTIVE_HIGH>, 39 <&hc595 3 GPIO_ACTIVE_HIGH>; 40 enable-gpios = <&hc595 4 GPIO_ACTIVE_HIGH>; 41 rs-gpios = <&hc595 5 GPIO_ACTIVE_HIGH>; 42 43 display-height-chars = <2>; 44 display-width-chars = <16>; 45 }; 46