diff options
Diffstat (limited to 'dts/Bindings/auxdisplay')
| -rw-r--r-- | dts/Bindings/auxdisplay/arm,versatile-lcd.yaml | 44 | ||||
| -rw-r--r-- | dts/Bindings/auxdisplay/arm-charlcd.txt | 18 | ||||
| -rw-r--r-- | dts/Bindings/auxdisplay/hit,hd44780.yaml | 31 | ||||
| -rw-r--r-- | dts/Bindings/auxdisplay/img,ascii-lcd.yaml | 55 | ||||
| -rw-r--r-- | dts/Bindings/auxdisplay/img-ascii-lcd.txt | 17 |
5 files changed, 129 insertions, 36 deletions
diff --git a/dts/Bindings/auxdisplay/arm,versatile-lcd.yaml b/dts/Bindings/auxdisplay/arm,versatile-lcd.yaml new file mode 100644 index 0000000000..5d02bd032a --- /dev/null +++ b/dts/Bindings/auxdisplay/arm,versatile-lcd.yaml @@ -0,0 +1,44 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/auxdisplay/arm,versatile-lcd.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ARM Versatile Character LCD + +maintainers: + - Linus Walleij <linus.walleij@linaro.org> + - Rob Herring <robh@kernel.org> + +description: + This binding defines the character LCD interface found on ARM Versatile AB + and PB reference platforms. + +properties: + compatible: + const: arm,versatile-lcd + + reg: + maxItems: 1 + + clocks: + maxItems: 1 + + clock-names: + maxItems: 1 + + interrupts: + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + lcd@10008000 { + compatible = "arm,versatile-lcd"; + reg = <0x10008000 0x1000>; + }; diff --git a/dts/Bindings/auxdisplay/arm-charlcd.txt b/dts/Bindings/auxdisplay/arm-charlcd.txt deleted file mode 100644 index e28e2aac47..0000000000 --- a/dts/Bindings/auxdisplay/arm-charlcd.txt +++ /dev/null @@ -1,18 +0,0 @@ -ARM Versatile Character LCD ------------------------------------------------------ -This binding defines the character LCD interface found on ARM Versatile AB -and PB reference platforms. - -Required properties: -- compatible : "arm,versatile-clcd" -- reg : Location and size of character LCD registers - -Optional properties: -- interrupts - single interrupt for character LCD. The character LCD can - operate in polled mode without an interrupt. - -Example: - lcd@10008000 { - compatible = "arm,versatile-lcd"; - reg = <0x10008000 0x1000>; - }; diff --git a/dts/Bindings/auxdisplay/hit,hd44780.yaml b/dts/Bindings/auxdisplay/hit,hd44780.yaml index 9222b06e93..fde07e4b11 100644 --- a/dts/Bindings/auxdisplay/hit,hd44780.yaml +++ b/dts/Bindings/auxdisplay/hit,hd44780.yaml @@ -12,7 +12,10 @@ maintainers: 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. + interface, which can be used in either 4-bit or 8-bit mode. By using a + GPIO expander it is possible to use the driver with one of the popular I2C + expander boards based on the PCF8574 available for these displays. For + an example see below. properties: compatible: @@ -94,3 +97,29 @@ examples: display-height-chars = <2>; display-width-chars = <16>; }; + - | + #include <dt-bindings/gpio/gpio.h> + i2c { + #address-cells = <1>; + #size-cells = <0>; + + pcf8574: pcf8574@27 { + compatible = "nxp,pcf8574"; + reg = <0x27>; + gpio-controller; + #gpio-cells = <2>; + }; + }; + hd44780 { + compatible = "hit,hd44780"; + display-height-chars = <2>; + display-width-chars = <16>; + data-gpios = <&pcf8574 4 0>, + <&pcf8574 5 0>, + <&pcf8574 6 0>, + <&pcf8574 7 0>; + enable-gpios = <&pcf8574 2 0>; + rs-gpios = <&pcf8574 0 0>; + rw-gpios = <&pcf8574 1 0>; + backlight-gpios = <&pcf8574 3 0>; + }; diff --git a/dts/Bindings/auxdisplay/img,ascii-lcd.yaml b/dts/Bindings/auxdisplay/img,ascii-lcd.yaml new file mode 100644 index 0000000000..1899b23de7 --- /dev/null +++ b/dts/Bindings/auxdisplay/img,ascii-lcd.yaml @@ -0,0 +1,55 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/auxdisplay/img,ascii-lcd.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: ASCII LCD displays on Imagination Technologies boards + +maintainers: + - Paul Burton <paulburton@kernel.org> + +properties: + compatible: + enum: + - img,boston-lcd + - mti,malta-lcd + - mti,sead3-lcd + + reg: + maxItems: 1 + + offset: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + Offset in bytes to the LCD registers within the system controller + +required: + - compatible + +oneOf: + - required: + - reg + - required: + - offset + +if: + properties: + compatible: + contains: + const: img,boston-lcd +then: + required: + - reg +else: + required: + - offset + +additionalProperties: false + +examples: + - | + lcd: lcd@17fff000 { + compatible = "img,boston-lcd"; + reg = <0x17fff000 0x8>; + }; diff --git a/dts/Bindings/auxdisplay/img-ascii-lcd.txt b/dts/Bindings/auxdisplay/img-ascii-lcd.txt deleted file mode 100644 index b69bb68992..0000000000 --- a/dts/Bindings/auxdisplay/img-ascii-lcd.txt +++ /dev/null @@ -1,17 +0,0 @@ -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. |