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The RG28XX panel is a display panel of the Anbernic RG28XX, a handheld gaming device from Anbernic. It is 2.8 inches in size (diagonally) with a resolution of 480x640. This panel is driven by a variant of the ST7701 driver IC internally, confirmed by dumping and analyzing its BSP initialization sequence by using a logic analyzer. It is very similar to the existing densitron,dmt028vghmcmi-1a panel, but differs in some unknown register values, so add a new entry for the panel to distinguish them. Additionally, the panel only has an SPI instead of MIPI DSI. So add and modify for SPI as well. Although a panel connected via SPI with a D/CX pin theoretically exists, no such panels have been found for this driver yet. Therefore, disable the use of the dc-gpios property for all currently known devices. Signed-off-by: Hironori KIKUCHI <kikuchan98@gmail.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com> Link: https://lore.kernel.org/r/20240804061503.881283-4-kikuchan98@gmail.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240804061503.881283-4-kikuchan98@gmail.com
144 lines
3.4 KiB
YAML
144 lines
3.4 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/display/panel/sitronix,st7701.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Sitronix ST7701 based LCD panels
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maintainers:
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- Jagan Teki <jagan@amarulasolutions.com>
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description: |
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ST7701 designed for small and medium sizes of TFT LCD display, is
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capable of supporting up to 480RGBX864 in resolution. It provides
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several system interfaces like MIPI/RGB/SPI.
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Techstar TS8550B is 480x854, 2-lane MIPI DSI LCD panel which has
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inbuilt ST7701 chip.
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Densitron DMT028VGHMCMI-1A is 480x640, 2-lane MIPI DSI LCD panel
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which has built-in ST7701 chip.
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properties:
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compatible:
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items:
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- enum:
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- anbernic,rg-arc-panel
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- anbernic,rg28xx-panel
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- densitron,dmt028vghmcmi-1a
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- elida,kd50t048a
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- techstar,ts8550b
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- const: sitronix,st7701
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reg:
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description: DSI / SPI channel used by that screen
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maxItems: 1
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VCC-supply:
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description: analog regulator for MIPI circuit
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IOVCC-supply:
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description: I/O system regulator
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dc-gpios:
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maxItems: 1
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description:
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Controller data/command selection (D/CX) in 4-line SPI mode.
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If not set, the controller is in 3-line SPI mode.
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Disallowed for DSI.
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port: true
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reset-gpios: true
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rotation: true
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backlight: true
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required:
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- compatible
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- reg
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- VCC-supply
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- IOVCC-supply
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- port
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- reset-gpios
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allOf:
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- $ref: panel-common.yaml#
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- if:
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properties:
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compatible:
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contains:
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# SPI connected panels
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enum:
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- anbernic,rg28xx-panel
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then:
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$ref: /schemas/spi/spi-peripheral-props.yaml#
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- if:
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properties:
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compatible:
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not:
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contains:
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# DSI or SPI without D/CX pin
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enum:
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- anbernic,rg-arc-panel
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- anbernic,rg28xx-panel
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- densitron,dmt028vghmcmi-1a
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- elida,kd50t048a
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- techstar,ts8550b
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then:
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required:
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- dc-gpios
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else:
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properties:
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dc-gpios: false
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/gpio/gpio.h>
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dsi {
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#address-cells = <1>;
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#size-cells = <0>;
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panel@0 {
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compatible = "techstar,ts8550b", "sitronix,st7701";
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reg = <0>;
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VCC-supply = <®_dldo2>;
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IOVCC-supply = <®_dldo2>;
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reset-gpios = <&pio 3 24 GPIO_ACTIVE_HIGH>; /* LCD-RST: PD24 */
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backlight = <&backlight>;
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port {
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mipi_in_panel: endpoint {
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remote-endpoint = <&mipi_out_panel>;
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};
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};
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};
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};
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- |
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#include <dt-bindings/gpio/gpio.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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panel@0 {
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compatible = "anbernic,rg28xx-panel", "sitronix,st7701";
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reg = <0>;
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spi-max-frequency = <3125000>;
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VCC-supply = <®_lcd>;
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IOVCC-supply = <®_lcd>;
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reset-gpios = <&pio 8 14 GPIO_ACTIVE_HIGH>; /* LCD-RST: PI14 */
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backlight = <&backlight>;
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port {
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panel_in_rgb: endpoint {
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remote-endpoint = <&tcon_lcd0_out_lcd>;
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};
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};
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};
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};
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