The parallel data bus is a simple parallel bus
that may be used to drive displays.
It is mostly used in simple embedded systems
but is also used in some desings utilising Linux.
Signed-off-by: Sam Ravnborg <s...@ravnborg.org>
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.../bindings/pardata/parallel-data-bus.txt | 60 ++++++++++++++++++++++
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Documentation/devicetree/bindings/pardata/parallel-data-bus.txt
diff --git a/Documentation/devicetree/bindings/pardata/parallel-data-bus.txt
b/Documentation/devicetree/bindings/pardata/parallel-data-bus.txt
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+DT binding for parallel data bus
+
+Required properties:
+- compatible: "parallel-data-bus"
+- data-gpios: array of 8 GPIO specifiers, referring to the GPIO pins
+ connected to the data signal lines DB0-DB7
+ (8-bit mode) of the LCD Controller's bus interface,
+- enable-gpios: GPIO specifier, referring to the GPIO pin connected to
+ the "E" (Enable) signal line of the controller's bus interface,
+- rs-gpios: GPIO specifier, referring to the GPIO pin
+ connected to the "RS" (Register Select) controller's bus interface,
+
+Required properties for 8080 interface:
+- readwrite-gpios: For chips with 8080 interface list the GPIO
+ pin connected to the controllers read/write pin
+
+Required properties for 6800 interface:
+- read-gpios: For chips with 6800 interface list the GPIO
+ pin connected to the controllers read pin
+- write-gpios: For chips with 6800 interface list the GPIO
+ pin connected to the controllers write pin
+
+Required property for child node(s):
+- reg: numeric identifier for the display
+
+Example:
+
+ backlight: backlight {
+ compatible = "gpio-backlight";
+ }
+
+ power: regulator@0 {
+ }
+
+ pardatabus {
+ compatible = "parallel-data-bus";
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_pardata>;
+ data-gpios = <&pioe 0 GPIO_ACTIVE_HIGH
+ &pioe 1 GPIO_ACTIVE_HIGH
+ &pioe 2 GPIO_ACTIVE_HIGH
+ &pioe 3 GPIO_ACTIVE_HIGH
+ &pioe 4 GPIO_ACTIVE_HIGH
+ &pioe 5 GPIO_ACTIVE_HIGH
+ &pioe 6 GPIO_ACTIVE_HIGH
+ &pioe 7 GPIO_ACTIVE_HIGH>;
+ enable-gpios = <&pioe 8 GPIO_ACTIVE_HIGH>;
+ rs-gpios = <&pioe 12 GPIO_ACTIVE_HIGH>;
+ readdwrite-gpios = <&pioe 11 GPIO_ACTIVE_HIGH>;
+
+ wg160160@0 {
+ compatible = "winstar,wg160160";
+ reg = <1>;
+ reset-gpios = <&pioe 13 GPIO_ACTIVE_LOW>;
+ chipselect-gpios = <&pioe 9 GPIO_ACTIVE_LOW>;
+ backlight = &backlight;
+ power = &power;
+ }
+ }
+
--
2.12.0
