dsi-controller.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/display/dsi-controller.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Common Properties for DSI Display Panels
    8 
    9 maintainers:
   10   - Linus Walleij <linus.walleij@linaro.org>
   11 
   12 description: |
   13   This document defines device tree properties common to DSI, Display
   14   Serial Interface controllers and attached panels. It doesn't constitute
   15   a device tree binding specification by itself but is meant to be referenced
   16   by device tree bindings.
   17 
   18   When referenced from panel device tree bindings the properties defined in
   19   this document are defined as follows. The panel device tree bindings are
   20   responsible for defining whether each property is required or optional.
   21 
   22   Notice: this binding concerns DSI panels connected directly to a master
   23   without any intermediate port graph to the panel. Each DSI master
   24   can control one to four virtual channels to one panel. Each virtual
   25   channel should have a node "panel" for their virtual channel with their
   26   reg-property set to the virtual channel number, usually there is just
   27   one virtual channel, number 0.
   28 
   29 properties:
   30   $nodename:
   31     pattern: "^dsi(@.*)?$"
   32 
   33   "#address-cells":
   34     const: 1
   35 
   36   "#size-cells":
   37     const: 0
   38 
   39 patternProperties:
   40   "^panel@[0-3]$":
   41     description: Panels connected to the DSI link
   42     type: object
   43 
   44     properties:
   45       reg:
   46         minimum: 0
   47         maximum: 3
   48         description:
   49           The virtual channel number of a DSI peripheral. Must be in the range
   50           from 0 to 3, as DSI uses a 2-bit addressing scheme. Some DSI
   51           peripherals respond to more than a single virtual channel. In that
   52           case the reg property can take multiple entries, one for each virtual
   53           channel that the peripheral responds to.
   54 
   55       clock-master:
   56         type: boolean
   57         description:
   58           Should be enabled if the host is being used in conjunction with
   59           another DSI host to drive the same peripheral. Hardware supporting
   60           such a configuration generally requires the data on both the busses
   61           to be driven by the same clock. Only the DSI host instance
   62           controlling this clock should contain this property.
   63 
   64       enforce-video-mode:
   65         type: boolean
   66         description:
   67           The best option is usually to run a panel in command mode, as this
   68           gives better control over the panel hardware. However for different
   69           reasons like broken hardware, missing features or testing, it may be
   70           useful to be able to force a command mode-capable panel into video
   71           mode.
   72 
   73     required:
   74       - reg
   75 
   76 additionalProperties: true
   77 
   78 examples:
   79   - |
   80     #include <dt-bindings/gpio/gpio.h>
   81     dsi@a0351000 {
   82         reg = <0xa0351000 0x1000>;
   83         #address-cells = <1>;
   84         #size-cells = <0>;
   85         panel@0 {
   86             compatible = "sony,acx424akp";
   87             reg = <0>;
   88             vddi-supply = <&ab8500_ldo_aux1_reg>;
   89             reset-gpios = <&gpio2 1 GPIO_ACTIVE_LOW>;
   90         };
   91     };
   92 
   93 ...

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