Hi,

On Mon, Sep 27, 2021 at 06:44:21PM +0200, H. Nikolaus Schaller wrote:
> From: Sam Ravnborg <sam@ravnborg.org>
> 
> Add DT bindings for the hdmi driver for the Ingenic JZ4780 SoC.
> Based on .txt binding from Zubair Lutfullah Kakakhel
> 
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> ---
>  .../bindings/display/ingenic-jz4780-hdmi.yaml | 85 +++++++++++++++++++
>  1 file changed, 85 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> new file mode 100644
> index 000000000000..5e60cdac4f63
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> @@ -0,0 +1,85 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/ingenic-jz4780-hdmi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Bindings for Ingenic JZ4780 HDMI Transmitter
> +
> +maintainers:
> +  - H. Nikolaus Schaller <hns@goldelico.com>
> +
> +description: |
> +  The HDMI Transmitter in the Ingenic JZ4780 is a Synopsys DesignWare HDMI 1.4
> +  TX controller IP with accompanying PHY IP.
> +
> +allOf:
> +  - $ref: panel/panel-common.yaml#

Is it a panel though?

> +properties:
> +  compatible:
> +    items:
> +      - const: ingenic,jz4780-dw-hdmi

This can just be a const, there's no need for the items

> +
> +  reg:
> +    maxItems: 1
> +    description: the address & size of the LCD controller registers

There's no need for that description, it's obvious enough

> +  reg-io-width:
> +    const: 4

If it's fixed, why do you need it in the first place?

> +  interrupts:
> +    maxItems: 1
> +    description: Specifies the interrupt provided by parent

There's no need for that description, it's obvious enough

> +  clocks:
> +    maxItems: 2
> +    description: Clock specifiers for isrf and iahb clocks

This can be defined as

clocks:
  items:
    - description: isrf
    - description: iahb

A better description about what these clocks are would be nice as well

> +  clock-names:
> +    items:
> +      - const: isfr

Is it isfr or isrf?

> +      - const: iahb
> +
> +  hdmi-regulator: true
> +    description: Optional regulator to provide +5V at the connector

regulators need to be suffixed by -supply

You also can just provide the description, you don't need the true there

> +  ddc-i2c-bus: true

ditto

> +    description: An I2C interface if the internal DDC I2C driver is not to be used
> +  ports: true

If there's a single port, you don't need ports

You should also include /schemas/graph.yaml#/$defs/port-base

Maxime