lkml.org 
[lkml]   [2021]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] dt-bindings: display: bridge: Add documentation for LT8912
On Sun, Jan 24, 2021 at 04:08:34PM +0100, Adrien Grassein wrote:
> Lontium LT8912 is a DSI to HDMI bridge.
>
> Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
> ---
> .../display/bridge/lontium,lt8912.yaml | 92 +++++++++++++++++++
> MAINTAINERS | 5 +
> 2 files changed, 97 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> new file mode 100644
> index 000000000000..ed1a6ddaab2f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/lontium,lt8912.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Lontium LT8912 MIPI to HDMI Bridge
> +
> +maintainers:
> + - Adrien Grassein <adrien.grassein@gmail.com>
> +
> +description: |
> + The LT8912 is a bridge device which convert DSI to HDMI
> +
> +properties:
> + compatible:
> + enum:
> + - lontium,lt8912
> +
> + reg:
> + maxItems: 1
> +
> + ddc-i2c-bus:

This belongs in an hdmi-connector node.

> + maxItems: 1
> + description: i2c bus used to read EDID of the connected display.
> +
> + dsi-lanes:
> + maxItems: 1
> + description: dsi lanes count interconnected with lt8912.

'data-lanes' in the graph is the standard way to do this.

You'll need video-interfaces.yaml which is pending in the media tree.

> +
> + reset-gpios:
> + maxItems: 1
> + description: GPIO connected to active high RESET pin.
> +
> + ports:
> + $ref: /schemas/graph.yaml#/properties/ports
> +
> + properties:
> + port@0:
> + $ref: /schemas/graph.yaml#/properties/port
> + description:
> + Primary MIPI port-1 for MIPI input

You're going to need a port for the connector.

> +
> + required:
> + - port@0
> +
> +required:
> + - compatible
> + - ddc-i2c-bus
> + - dsi-lanes
> + - reg
> + - reset-gpios
> + - ports
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/gpio/gpio.h>
> +
> + i2c4 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + hdmi-bridge@48 {
> + compatible = "lontium,lt8912";
> + reg = <0x48>;
> + reset-gpios = <&max7323 0 GPIO_ACTIVE_LOW>;
> + dsi-lanes = <4>;
> + ddc-i2c-bus = <&ddc_i2c_bus>;
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> +
> + hdmi_out_in: endpoint {
> + remote-endpoint = <&mipi_dsi_out>;
> + };
> + };
> + };
> + };
> + };
> +
> + ddc_i2c_bus: i2c5 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + };
> +
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 5aa18cbfb883..01e7e356bfac 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10472,6 +10472,11 @@ S: Maintained
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
> F: drivers/hid/hid-lg-g15.c
>
> +LONTIUM LT8912 MIPI TO HDMI BRIDGE
> +M: Adrien Grassein <adrien.grassein@gmail.com>
> +S: Maintained
> +F: Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> +
> LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
> M: Sathya Prakash <sathya.prakash@broadcom.com>
> M: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
> --
> 2.25.1
>

\
 
 \ /
  Last update: 2021-02-09 17:40    [W:0.046 / U:0.456 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site