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20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
177 lines
5.3 KiB
Diff
177 lines
5.3 KiB
Diff
From e39c2eeca4868a7cf34e34fb9a9ca7119c30372a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
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Date: Sun, 27 Feb 2022 13:47:09 +0100
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Subject: [PATCH] dt-bindings: display: add bindings for MIPI DBI
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compatible SPI panels
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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commit 2f3468b upstream.
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Add binding for MIPI DBI compatible SPI panels.
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v6:
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- Fix indentation (Rob)
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v5:
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- Add sainsmart18 to compatible items (Rob)
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- Expand write-only description (Sam)
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v4:
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- There should only be two compatible (Maxime)
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- s/panel-dbi-spi/panel-mipi-dbi-spi/in compatible
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v3:
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- Move properties to Device Tree (Maxime)
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- Use contains for compatible (Maxime)
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- Add backlight property to example
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- Flesh out description
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v2:
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- Fix path for panel-common.yaml
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- Use unevaluatedProperties
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- Drop properties which are in the allOf section
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- Drop model property (Rob)
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Acked-by: Maxime Ripard <maxime@cerno.tech>
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Acked-by: Sam Ravnborg <sam@ravnborg.org>
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Reviewed-by: Rob Herring <robh@kernel.org>
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Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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Link: https://patchwork.freedesktop.org/patch/msgid/20220227124713.39766-2-noralf@tronnes.org
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---
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.../display/panel/panel-mipi-dbi-spi.yaml | 126 ++++++++++++++++++
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1 file changed, 126 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/display/panel/panel-mipi-dbi-spi.yaml
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/display/panel/panel-mipi-dbi-spi.yaml
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@@ -0,0 +1,126 @@
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+# 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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+$id: http://devicetree.org/schemas/display/panel/panel-mipi-dbi-spi.yaml#
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+$schema: http://devicetree.org/meta-schemas/core.yaml#
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+
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+title: MIPI DBI SPI Panel
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+
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+maintainers:
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+ - Noralf Trønnes <noralf@tronnes.org>
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+
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+description: |
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+ This binding is for display panels using a MIPI DBI compatible controller
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+ in SPI mode.
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+
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+ The MIPI Alliance Standard for Display Bus Interface defines the electrical
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+ and logical interfaces for display controllers historically used in mobile
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+ phones. The standard defines 4 display architecture types and this binding is
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+ for type 1 which has full frame memory. There are 3 interface types in the
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+ standard and type C is the serial interface.
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+
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+ The standard defines the following interface signals for type C:
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+ - Power:
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+ - Vdd: Power supply for display module
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+ - Vddi: Logic level supply for interface signals
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+ Combined into one in this binding called: power-supply
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+ - Interface:
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+ - CSx: Chip select
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+ - SCL: Serial clock
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+ - Dout: Serial out
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+ - Din: Serial in
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+ - SDA: Bidrectional in/out
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+ - D/CX: Data/command selection, high=data, low=command
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+ Called dc-gpios in this binding.
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+ - RESX: Reset when low
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+ Called reset-gpios in this binding.
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+
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+ The type C interface has 3 options:
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+
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+ - Option 1: 9-bit mode and D/CX as the 9th bit
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+ | Command | the next command or following data |
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+ |<0><D7><D6><D5><D4><D3><D2><D1><D0>|<D/CX><D7><D6><D5><D4><D3><D2><D1><D0>|
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+
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+ - Option 2: 16-bit mode and D/CX as a 9th bit
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+ | Command or data |
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+ |<X><X><X><X><X><X><X><D/CX><D7><D6><D5><D4><D3><D2><D1><D0>|
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+
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+ - Option 3: 8-bit mode and D/CX as a separate interface line
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+ | Command or data |
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+ |<D7><D6><D5><D4><D3><D2><D1><D0>|
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+
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+ The panel resolution is specified using the panel-timing node properties
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+ hactive (width) and vactive (height). The other mandatory panel-timing
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+ properties should be set to zero except clock-frequency which can be
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+ optionally set to inform about the actual pixel clock frequency.
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+
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+ If the panel is wired to the controller at an offset specify this using
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+ hback-porch (x-offset) and vback-porch (y-offset).
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+
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+allOf:
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+ - $ref: panel-common.yaml#
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+ - $ref: /schemas/spi/spi-peripheral-props.yaml#
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+
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+properties:
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+ compatible:
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+ items:
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+ - enum:
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+ - sainsmart18
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+ - const: panel-mipi-dbi-spi
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+
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+ write-only:
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+ type: boolean
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+ description:
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+ Controller is not readable (ie. Din (MISO on the SPI interface) is not
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+ wired up).
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+
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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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+
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+required:
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+ - compatible
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+ - reg
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+ - panel-timing
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+
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+unevaluatedProperties: false
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+
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+examples:
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+ - |
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+ #include <dt-bindings/gpio/gpio.h>
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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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+
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+ display@0{
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+ compatible = "sainsmart18", "panel-mipi-dbi-spi";
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+ reg = <0>;
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+ spi-max-frequency = <40000000>;
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+
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+ dc-gpios = <&gpio 24 GPIO_ACTIVE_HIGH>;
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+ reset-gpios = <&gpio 25 GPIO_ACTIVE_HIGH>;
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+ write-only;
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+
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+ backlight = <&backlight>;
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+
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+ width-mm = <35>;
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+ height-mm = <28>;
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+
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+ panel-timing {
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+ hactive = <160>;
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+ vactive = <128>;
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+ hback-porch = <0>;
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+ vback-porch = <0>;
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+ clock-frequency = <0>;
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+ hfront-porch = <0>;
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+ hsync-len = <0>;
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+ vfront-porch = <0>;
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+ vsync-len = <0>;
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+ };
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+ };
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+ };
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+
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+...
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