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Diffstat (limited to 'Documentation/devicetree/bindings/auxdisplay')
| -rw-r--r-- | Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt | 45 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/auxdisplay/img-ascii-lcd.txt | 17 |
2 files changed, 62 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt new file mode 100644 index 000000000000..2aa24b889923 --- /dev/null +++ b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt @@ -0,0 +1,45 @@ +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>; + }; diff --git a/Documentation/devicetree/bindings/auxdisplay/img-ascii-lcd.txt b/Documentation/devicetree/bindings/auxdisplay/img-ascii-lcd.txt new file mode 100644 index 000000000000..b69bb68992fd --- /dev/null +++ b/Documentation/devicetree/bindings/auxdisplay/img-ascii-lcd.txt @@ -0,0 +1,17 @@ +Binding for ASCII LCD displays on Imagination Technologies boards + +Required properties: +- compatible : should be one of: + "img,boston-lcd" + "mti,malta-lcd" + "mti,sead3-lcd" + +Required properties for "img,boston-lcd": +- reg : memory region locating the device registers + +Required properties for "mti,malta-lcd" or "mti,sead3-lcd": +- regmap: phandle of the system controller containing the LCD registers +- offset: offset in bytes to the LCD registers within the system controller + +The layout of the registers & properties of the display are determined +from the compatible string, making this binding somewhat trivial. |