# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/bridge/fsl,imx8qxp-ldb.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Freescale i.MX8qm/qxp LVDS Display Bridge
maintainers:
- Liu Ying <[email protected]>
description: |
The Freescale i.MX8qm/qxp LVDS Display Bridge(LDB) has two channels.
The i.MX8qm/qxp LDB is controlled by Control and Status Registers(CSR) module.
The CSR module, as a system controller, contains the LDB's configuration
registers.
For i.MX8qxp LDB, each channel supports up to 24bpp parallel input color
format and can map the input to VESA or JEIDA standards. The two channels
cannot be used simultaneously, that is to say, the user should pick one of
them to use. Two LDB channels from two LDB instances can work together in
LDB split mode to support a dual link LVDS display. The channel indexes
have to be different. Channel0 outputs odd pixels and channel1 outputs
even pixels.
For i.MX8qm LDB, each channel additionally supports up to 30bpp parallel
input color format. The two channels can be used simultaneously, either
in dual mode or split mode. In dual mode, the two channels output identical
data. In split mode, channel0 outputs odd pixels and channel1 outputs even
pixels.
A side note is that i.MX8qm/qxp LDB is officially called pixel mapper in
the SoC reference manuals. The pixel mapper uses logic of LDBs embedded in
i.MX6qdl/sx SoCs, i.e., it is essentially based on them. To keep the naming
consistency, this binding calls it LDB.
properties:
compatible:
enum:
- fsl,imx8qm-ldb
- fsl,imx8qxp-ldb
"#address-cells":
const: 1
"#size-cells":
const: 0
clocks:
items:
- description: pixel clock
- description: bypass clock
clock-names:
items:
- const: pixel
- const: bypass
power-domains:
maxItems: 1
fsl,companion-ldb:
$ref: /schemas/types.yaml#/definitions/phandle
description: |
A phandle which points to companion LDB which is used in LDB split mode.
patternProperties:
"^channel@[0-1]$":
type: object
description: Represents a channel of LDB.
properties:
"#address-cells":
const: 1
"#size-cells":
const: 0
reg:
description: The channel index.
enum: [ 0, 1 ]
phys:
description: A phandle to the phy module representing the LVDS PHY.
maxItems: 1
phy-names:
const: lvds_phy
port@0:
$ref: /schemas/graph.yaml#/properties/port
description: Input port of the channel.
port@1:
$ref: /schemas/graph.yaml#/properties/port
description: Output port of the channel.
required:
- "#address-cells"
- "#size-cells"
- reg
- phys
- phy-names
additionalProperties: false
required:
- compatible
- "#address-cells"
- "#size-cells"
- clocks
- clock-names
- power-domains
- channel@0
- channel@1
allOf:
- if:
properties:
compatible:
contains:
const: fsl,imx8qm-ldb
then:
properties:
fsl,companion-ldb: false
additionalProperties: false
examples:
- |
#include <dt-bindings/firmware/imx/rsrc.h>
ldb {
#address-cells = <1>;
#size-cells = <0>;
compatible = "fsl,imx8qxp-ldb";
clocks = <&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_MISC2>,
<&clk IMX_SC_R_LVDS_0 IMX_SC_PM_CLK_BYPASS>;
clock-names = "pixel", "bypass";
power-domains = <&pd IMX_SC_R_LVDS_0>;
channel@0 {
#address-cells = <1>;
#size-cells = <0>;
reg = <0>;
phys = <&mipi_lvds_0_phy>;
phy-names = "lvds_phy";
port@0 {
reg = <0>;
mipi_lvds_0_ldb_ch0_mipi_lvds_0_pxl2dpi: endpoint {
remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch0>;
};
};
};
channel@1 {
#address-cells = <1>;
#size-cells = <0>;
reg = <1>;
phys = <&mipi_lvds_0_phy>;
phy-names = "lvds_phy";
port@0 {
reg = <0>;
mipi_lvds_0_ldb_ch1_mipi_lvds_0_pxl2dpi: endpoint {
remote-endpoint = <&mipi_lvds_0_pxl2dpi_mipi_lvds_0_ldb_ch1>;
};
};
};
};
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