linux-kernel - [PATCH v1 1/5] dt-bindings: add parallel data bus (pardata)

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Date:   Thu,  2 Aug 2018 21:45:32 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Noralf T <noralf@...nnes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:     Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH v1 1/5] dt-bindings: add parallel data bus (pardata)

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 <sam@...nborg.org>
---
 .../bindings/pardata/parallel-data-bus.txt         | 60 ++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 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
new file mode 100644
index 000000000000..fa33b5bb8302
--- /dev/null
+++ b/Documentation/devicetree/bindings/pardata/parallel-data-bus.txt
@@ -0,0 +1,60 @@
+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