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dt-bindings: display: convert Arm HDLCD to DT schema

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The Arm HDLCD is a display controller that scans out a framebuffer and
hands a signal to a digital encoder to generate a DVI or HDMI signal.

Convert the existing DT binding to DT schema.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220506140533.3566431-10-andre.przywara@arm.com
This commit is contained in:
Andre Przywara 2022-05-06 15:05:31 +01:00 committed by Rob Herring
parent 3f7e3653c1
commit 36fd2a65bc
2 changed files with 89 additions and 79 deletions
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79
Documentation/devicetree/bindings/display/arm,hdlcd.txt
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ARM HDLCD
This is a display controller found on several development platforms produced
by ARM Ltd and in more modern of its' Fast Models. The HDLCD is an RGB
streamer that reads the data from a framebuffer and sends it to a single
digital encoder (DVI or HDMI).
Required properties:
- compatible: "arm,hdlcd"
- reg: Physical base address and length of the controller's registers.
- interrupts: One interrupt used by the display controller to notify the
interrupt controller when any of the interrupt sources programmed in
the interrupt mask register have activated.
- clocks: A list of phandle + clock-specifier pairs, one for each
entry in 'clock-names'.
- clock-names: A list of clock names. For HDLCD it should contain:
- "pxlclk" for the clock feeding the output PLL of the controller.
Required sub-nodes:
- port: The HDLCD connection to an encoder chip. The connection is modeled
using the OF graph bindings specified in
Documentation/devicetree/bindings/graph.txt.
Optional properties:
- memory-region: phandle to a node describing memory (see
Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt) to be
used for the framebuffer; if not present, the framebuffer may be located
anywhere in memory.
Example:
/ {
...
hdlcd@2b000000 {
compatible = "arm,hdlcd";
reg = <0 0x2b000000 0 0x1000>;
interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&oscclk5>;
clock-names = "pxlclk";
port {
hdlcd_output: endpoint@0 {
remote-endpoint = <&hdmi_enc_input>;
};
};
};
/* HDMI encoder on I2C bus */
i2c@7ffa0000 {
....
hdmi-transmitter@70 {
compatible = ".....";
reg = <0x70>;
port@0 {
hdmi_enc_input: endpoint {
remote-endpoint = <&hdlcd_output>;
};
hdmi_enc_output: endpoint {
remote-endpoint = <&hdmi_1_port>;
};
};
};
};
hdmi1: connector@1 {
compatible = "hdmi-connector";
type = "a";
port {
hdmi_1_port: endpoint {
remote-endpoint = <&hdmi_enc_output>;
};
};
};
...
};

89
Documentation/devicetree/bindings/display/arm,hdlcd.yaml Normal file
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/display/arm,hdlcd.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Arm HDLCD display controller binding
maintainers:
- Liviu Dudau <Liviu.Dudau@arm.com>
- Andre Przywara <andre.przywara@arm.com>
description:
The Arm HDLCD is a display controller found on several development platforms
produced by ARM Ltd and in more modern of its Fast Models. The HDLCD is an
RGB streamer that reads the data from a framebuffer and sends it to a single
digital encoder (DVI or HDMI).
properties:
compatible:
const: arm,hdlcd
reg:
maxItems: 1
interrupts:
maxItems: 1
clock-names:
const: pxlclk
clocks:
maxItems: 1
description: The input reference for the pixel clock.
memory-region:
maxItems: 1
description:
Phandle to a node describing memory to be used for the framebuffer.
If not present, the framebuffer may be located anywhere in memory.
iommus:
maxItems: 1
port:
$ref: /schemas/graph.yaml#/properties/port
unevaluatedProperties: false
description:
Output endpoint of the controller, connecting the LCD panel signals.
additionalProperties: false
required:
- compatible
- reg
- interrupts
- clocks
- port
examples:
- |
hdlcd@2b000000 {
compatible = "arm,hdlcd";
reg = <0x2b000000 0x1000>;
interrupts = <0 85 4>;
clocks = <&oscclk5>;
clock-names = "pxlclk";
port {
hdlcd_output: endpoint {
remote-endpoint = <&hdmi_enc_input>;
};
};
};
/* HDMI encoder on I2C bus */
i2c {
#address-cells = <1>;
#size-cells = <0>;
hdmi-transmitter@70 {
compatible = "nxp,tda998x";
reg = <0x70>;
port {
hdmi_enc_input: endpoint {
remote-endpoint = <&hdlcd_output>;
};
};
};
};
...