From: Viktar Simanenka <viteosen@gmail.com>
To: David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Viktar Simanenka <viteosen@gmail.com>,
dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Subject: [PATCH v4 1/2 RESEND] dt-bindings: display: add bindings for pcd8544 displays
Date: Mon, 7 Aug 2023 15:10:21 +0300 [thread overview]
Message-ID: <20230807121022.1871-1-viteosen@gmail.com> (raw)
Add device tree binding documentation for PCD8544 LCD display controller.
Signed-off-by: Viktar Simanenka <viteosen@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
v4:remove reference to panel/panel-common.yaml
add optional backlight property
v3 link: https://lore.kernel.org/linux-devicetree/20230720124026.356603-1-viteosen@gmail.com/
.../bindings/display/nxp,pcd8544.yaml | 100 ++++++++++++++++++
1 file changed, 100 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/nxp,pcd8544.yaml
diff --git a/Documentation/devicetree/bindings/display/nxp,pcd8544.yaml b/Documentation/devicetree/bindings/display/nxp,pcd8544.yaml
new file mode 100644
index 000000000000..236eb4f4b3a8
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/nxp,pcd8544.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/nxp,pcd8544.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Philips Semiconductors PCD8544 LCD Display Controller
+
+maintainers:
+ - Viktar Simanenka <viteosen@gmail.com>
+
+description: |
+ Philips Semiconductors PCD8544 LCD Display Controller with SPI control bus.
+ Designed to drive a graphic display of 48 rows and 84 columns,
+ such as Nokia 5110/3310 LCDs.
+
+allOf:
+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+ compatible:
+ enum:
+ - nxp,pcd8544
+
+ dc-gpios:
+ maxItems: 1
+ description: Data/Command selection pin (D/CX).
+
+ reset-gpios:
+ maxItems: 1
+ description: Display Reset pin (RST).
+
+ backlight:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: |
+ Phandle of the backlight device. The display may have an LED pin that
+ controls the backlight through GPIO or PWM.
+
+ nxp,inverted:
+ type: boolean
+ description: Display color inversion.
+
+ nxp,voltage-op:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 127
+ description: |
+ Liquid crystall voltage operation coefficient. Determines the LCD
+ controlling voltage on display segments. Should be adjusted according
+ to the ambient temperature. Adjusts the contrast of the display.
+
+ nxp,temperature-coeff:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 3
+ description: |
+ Display temperature compensation coefficient. Increases LCD controlling
+ voltage at lower temperatures to maintain optimum contrast.
+
+ nxp,bias:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 7
+ description: |
+ Display bias system coefficient. Should only be changed if an external
+ oscillator is used for the display.
+
+required:
+ - compatible
+ - reg
+ - dc-gpios
+ - reset-gpios
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+
+ spi {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ display@0 {
+ compatible = "nxp,pcd8544";
+ reg = <0>;
+ spi-max-frequency = <8000000>;
+
+ dc-gpios = <&pio 0 3 GPIO_ACTIVE_HIGH>; /* DC=PA3 */
+ reset-gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* RESET=PA1 */
+ backlight = <&backlight>;
+
+ nxp,inverted;
+ nxp,voltage-op = <0>;
+ nxp,bias = <4>;
+ nxp,temperature-coeff = <0>;
+ };
+ };
+
+...
--
2.34.1
next reply other threads:[~2023-08-07 12:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-07 12:10 Viktar Simanenka [this message]
2023-08-07 12:10 ` [PATCH v4 2/2 RESEND] drm/tiny: add display driver for philips pcd8544 display controller Viktar Simanenka
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