1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 $id: http://devicetree.org/schemas/display/panel/panel-mipi-dbi-spi.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MIPI DBI SPI Panel
10 - Noralf Trønnes <noralf@tronnes.org>
13 This binding is for display panels using a MIPI DBI compatible controller
16 The MIPI Alliance Standard for Display Bus Interface defines the electrical
17 and logical interfaces for display controllers historically used in mobile
18 phones. The standard defines 4 display architecture types and this binding is
19 for type 1 which has full frame memory. There are 3 interface types in the
20 standard and type C is the serial interface.
22 The standard defines the following interface signals for type C:
24 - Vdd: Power supply for display module
25 Called power-supply in this binding.
26 - Vddi: Logic level supply for interface signals
27 Called io-supply in this binding.
33 - SDA: Bidrectional in/out
34 - D/CX: Data/command selection, high=data, low=command
35 Called dc-gpios in this binding.
36 - RESX: Reset when low
37 Called reset-gpios in this binding.
39 The type C interface has 3 options:
41 - Option 1: 9-bit mode and D/CX as the 9th bit
42 | Command | the next command or following data |
43 |<0><D7><D6><D5><D4><D3><D2><D1><D0>|<D/CX><D7><D6><D5><D4><D3><D2><D1><D0>|
45 - Option 2: 16-bit mode and D/CX as a 9th bit
47 |<X><X><X><X><X><X><X><D/CX><D7><D6><D5><D4><D3><D2><D1><D0>|
49 - Option 3: 8-bit mode and D/CX as a separate interface line
51 |<D7><D6><D5><D4><D3><D2><D1><D0>|
53 The panel resolution is specified using the panel-timing node properties
54 hactive (width) and vactive (height). The other mandatory panel-timing
55 properties should be set to zero except clock-frequency which can be
56 optionally set to inform about the actual pixel clock frequency.
58 If the panel is wired to the controller at an offset specify this using
59 hback-porch (x-offset) and vback-porch (y-offset).
62 - $ref: panel-common.yaml#
63 - $ref: /schemas/spi/spi-peripheral-props.yaml#
72 - const: panel-mipi-dbi-spi
77 Controller is not readable (ie. Din (MISO on the SPI interface) is not
83 Controller data/command selection (D/CX) in 4-line SPI mode.
84 If not set, the controller is in 3-line SPI mode.
88 Logic level supply for interface signals (Vddi).
89 No need to set if this is the same as power-supply.
100 unevaluatedProperties: false
104 #include <dt-bindings/gpio/gpio.h>
107 #address-cells = <1>;
111 compatible = "sainsmart18", "panel-mipi-dbi-spi";
113 spi-max-frequency = <40000000>;
115 dc-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
116 reset-gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
119 backlight = <&backlight>;
129 clock-frequency = <0>;