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dt-bindings: display: add panel-timing.yaml

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Add meta-schema variant of panel-timing and
reference it from panel-common.yaml.

Part of this came form other files with other
licenses - original commits:

commit cc3f414cf2 ("video: add of helper for display timings/videomode")
commit 86f46565df ("dt-bindings: display: display-timing: Add property to configure sync drive edge")
commit 9cad9c95d7 ("Documentation: DocBook DRM framework documentation")

The original authors acked the license change to:
(GPL-2.0-only OR BSD-2-Clause)

v2:
  - Got OK from original authors for re-license
    Huge thanks for the quick replies!
  - Typo fixes (Oleksandr)
  - Drop -array variant when not needed (Maxime)
  - Replace oneOf:... with enum (Maxime)
  - Drop type from clock-frequency (Rob)
  - Drop "|" when not needed (Rob)

v3:
  - Added comment to acks that are only for the license change
  - Add yaml document terminator "..."
  - Updated description (removed reference to native-mode)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> [license change]
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> [license change]
Acked-by: Steffen Trumtrar <s.trumtrar@pengutronix.de> [license change]
Acked-by: Philipp Zabel <p.zabel@pengutronix.de> [license change]
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: devicetree@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20200216181513.28109-2-sam@ravnborg.org
This commit is contained in:
Sam Ravnborg 2020-02-16 19:15:09 +01:00
parent 899f24ed8d
commit 3aa31ced2f
2 changed files with 230 additions and 4 deletions
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7
Documentation/devicetree/bindings/display/panel/panel-common.yaml
View File

@ -54,13 +54,12 @@ properties:
# Display Timings
panel-timing:
type: object
description:
Most display panels are restricted to a single resolution and
require specific display timings. The panel-timing subnode expresses those
timings as specified in the timing subnode section of the display timing
bindings defined in
Documentation/devicetree/bindings/display/panel/display-timing.txt.
timings.
allOf:
- $ref: panel-timing.yaml#
# Connectivity
port:

227
Documentation/devicetree/bindings/display/panel/panel-timing.yaml Normal file
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@ -0,0 +1,227 @@
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/panel/panel-timing.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: panel timing bindings
maintainers:
- Thierry Reding <thierry.reding@gmail.com>
- Sam Ravnborg <sam@ravnborg.org>
description: |
There are different ways of describing the timing data of a panel. The
devicetree representation corresponds to the one commonly found in datasheets
for panels.
The parameters are defined as seen in the following illustration.
+----------+-------------------------------------+----------+-------+
| | ^ | | |
| | |vback_porch | | |
| | v | | |
+----------#######################################----------+-------+
| # ^ # | |
| # | # | |
| hback # | # hfront | hsync |
| porch # | hactive # porch | len |
|<-------->#<-------+--------------------------->#<-------->|<----->|
| # | # | |
| # |vactive # | |
| # | # | |
| # v # | |
+----------#######################################----------+-------+
| | ^ | | |
| | |vfront_porch | | |
| | v | | |
+----------+-------------------------------------+----------+-------+
| | ^ | | |
| | |vsync_len | | |
| | v | | |
+----------+-------------------------------------+----------+-------+
The following is the panel timings shown with time on the x-axis.
This matches the timing diagrams often found in data sheets.
Active Front Sync Back
Region Porch Porch
<-----------------------><----------------><-------------><-------------->
//////////////////////|
////////////////////// |
////////////////////// |.................. ................
_______________
Timing can be specified either as a typical value or as a tuple
of min, typ, max values.
properties:
clock-frequency:
description: Panel clock in Hz
hactive:
$ref: /schemas/types.yaml#/definitions/uint32
description: Horizontal panel resolution in pixels
vactive:
$ref: /schemas/types.yaml#/definitions/uint32
description: Vertical panel resolution in pixels
hfront-porch:
description: Horizontal front porch panel timing
oneOf:
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- maxItems: 1
items:
description: typical number of pixels
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- minItems: 3
maxItems: 3
items:
description: min, typ, max number of pixels
hback-porch:
description: Horizontal back porch timing
oneOf:
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- maxItems: 1
items:
description: typical number of pixels
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- minItems: 3
maxItems: 3
items:
description: min, typ, max number of pixels
hsync-len:
description: Horizontal sync length panel timing
oneOf:
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- maxItems: 1
items:
description: typical number of pixels
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- minItems: 3
maxItems: 3
items:
description: min, typ, max number of pixels
vfront-porch:
description: Vertical front porch panel timing
oneOf:
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- maxItems: 1
items:
description: typical number of lines
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- minItems: 3
maxItems: 3
items:
description: min, typ, max number of lines
vback-porch:
description: Vertical back porch panel timing
oneOf:
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- maxItems: 1
items:
description: typical number of lines
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- minItems: 3
maxItems: 3
items:
description: min, typ, max number of lines
vsync-len:
description: Vertical sync length panel timing
oneOf:
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32
- maxItems: 1
items:
description: typical number of lines
- allOf:
- $ref: /schemas/types.yaml#/definitions/uint32-array
- minItems: 3
maxItems: 3
items:
description: min, typ, max number of lines
hsync-active:
description: |
Horizontal sync pulse.
0 selects active low, 1 selects active high.
If omitted then it is not used by the hardware
enum: [0, 1]
vsync-active:
description: |
Vertical sync pulse.
0 selects active low, 1 selects active high.
If omitted then it is not used by the hardware
enum: [0, 1]
de-active:
description: |
Data enable.
0 selects active low, 1 selects active high.
If omitted then it is not used by the hardware
enum: [0, 1]
pixelclk-active:
description: |
Data driving on rising or falling edge.
Use 0 to drive pixel data on falling edge and
sample data on rising edge.
Use 1 to drive pixel data on rising edge and
sample data on falling edge
enum: [0, 1]
syncclk-active:
description: |
Drive sync on rising or sample sync on falling edge.
If not specified then the setup is as specified by pixelclk-active.
Use 0 to drive sync on falling edge and
sample sync on rising edge of pixel clock.
Use 1 to drive sync on rising edge and
sample sync on falling edge of pixel clock
enum: [0, 1]
interlaced:
type: boolean
description: Enable interlaced mode
doublescan:
type: boolean
description: Enable double scan mode
doubleclk:
type: boolean
description: Enable double clock mode
required:
- clock-frequency
- hactive
- vactive
- hfront-porch
- hback-porch
- hsync-len
- vfront-porch
- vback-porch
- vsync-len
additionalProperties: false
...