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Message-Id: <20200514113003.19067-1-geert@linux-m68k.org>
Date: Thu, 14 May 2020 13:30:02 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
Rob Herring <robh+dt@...nel.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH] dt-bindings: auxdisplay: hd44780: Convert to json-schema
Convert the Hitachi HD44780 Character LCD Controller Device Tree binding
documentation to json-schema.
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
.../bindings/auxdisplay/hit,hd44780.txt | 45 ---------
.../bindings/auxdisplay/hit,hd44780.yaml | 96 +++++++++++++++++++
2 files changed, 96 insertions(+), 45 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt
create mode 100644 Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
diff --git a/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt
deleted file mode 100644
index 2aa24b8899236882..0000000000000000
--- a/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.txt
+++ /dev/null
@@ -1,45 +0,0 @@
-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/hit,hd44780.yaml b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
new file mode 100644
index 0000000000000000..9222b06e93a042e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/auxdisplay/hit,hd44780.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/auxdisplay/hit,hd44780.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Hitachi HD44780 Character LCD Controller
+
+maintainers:
+ - Geert Uytterhoeven <geert@...ux-m68k.org>
+
+description:
+ 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.
+
+properties:
+ compatible:
+ const: hit,hd44780
+
+ data-gpios:
+ description:
+ 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.
+ oneOf:
+ - maxItems: 4
+ - maxItems: 8
+
+ enable-gpios:
+ description:
+ GPIO pin connected to the "E" (Enable) signal line of the LCD
+ Controller's bus interface.
+ maxItems: 1
+
+ rs-gpios:
+ description:
+ GPIO pin connected to the "RS" (Register Select) signal line of the LCD
+ Controller's bus interface.
+ maxItems: 1
+
+ rw-gpios:
+ description:
+ GPIO pin connected to the "RW" (Read/Write) signal line of the LCD
+ Controller's bus interface.
+ maxItems: 1
+
+ backlight-gpios:
+ description: GPIO pin used for enabling the LCD's backlight.
+ maxItems: 1
+
+ display-height-chars:
+ description: Height of the display, in character cells,
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 4
+
+ display-width-chars:
+ description: Width of the display, in character cells.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 64
+
+ internal-buffer-width:
+ description:
+ Internal buffer width (default is 40 for displays with 1 or 2 lines, and
+ display-width-chars for displays with more than 2 lines).
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 1
+ maximum: 64
+
+required:
+ - compatible
+ - data-gpios
+ - enable-gpios
+ - rs-gpios
+ - display-height-chars
+ - display-width-chars
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ 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>;
+ };
--
2.17.1
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