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The datasheet lists the minimum Serial clock cycle (Write) as 66ns which is 15MHz. Mostly it can do much better than that and is in fact often run at 32MHz. With a clever driver that runs configuration commands at a low speed and only the pixel data at the maximum speed the configuration can't be messed up by transfer errors and the speed is only limited by the amount of pixel glitches that one is able to tolerate. Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Acked-by: Rob Herring <robh@kernel.org> Acked-by: David Lechner <david@lechnology.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211124150757.17929-4-noralf@tronnes.org
77 lines
1.8 KiB
YAML
77 lines
1.8 KiB
YAML
# SPDX-License-Identifier: GPL-2.0-only
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/display/sitronix,st7735r.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Sitronix ST7735R Display Panels Device Tree Bindings
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maintainers:
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- David Lechner <david@lechnology.com>
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description:
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This binding is for display panels using a Sitronix ST7715R or ST7735R
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controller in SPI mode.
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allOf:
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- $ref: panel/panel-common.yaml#
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properties:
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compatible:
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oneOf:
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- description:
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Adafruit 1.8" 160x128 Color TFT LCD (Product ID 358 or 618)
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items:
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- enum:
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- jianda,jd-t18003-t01
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- const: sitronix,st7735r
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- description:
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Okaya 1.44" 128x128 Color TFT LCD (E.g. Renesas YRSK-LCD-PMOD)
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items:
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- enum:
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- okaya,rh128128t
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- const: sitronix,st7715r
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dc-gpios:
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maxItems: 1
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description: Display data/command selection (D/CX)
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backlight: true
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reg: true
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spi-max-frequency: true
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reset-gpios: true
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rotation: true
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required:
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- compatible
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- reg
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- dc-gpios
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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backlight: backlight {
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compatible = "gpio-backlight";
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gpios = <&gpio 44 GPIO_ACTIVE_HIGH>;
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};
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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display@0{
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compatible = "jianda,jd-t18003-t01", "sitronix,st7735r";
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reg = <0>;
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spi-max-frequency = <32000000>;
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dc-gpios = <&gpio 43 GPIO_ACTIVE_HIGH>;
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reset-gpios = <&gpio 80 GPIO_ACTIVE_HIGH>;
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rotation = <270>;
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backlight = <&backlight>;
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};
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};
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...
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