[Letux-kernel] [RFC v3 4/8] dt-bindings: display: add ingenic-jz4780-hdmi DT Schema

Sam Ravnborg sam at ravnborg.org
Thu Apr 9 09:12:37 CEST 2020


Hi Nikolaus.

On Sun, Mar 29, 2020 at 07:35:50PM +0200, H. Nikolaus Schaller wrote:
> From: Sam Ravnborg <sam at 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 at ravnborg.org>
> Signed-off-by: H. Nikolaus Schaller <hns at goldelico.com>
> Cc: Rob Herring <robh at kernel.org>
> Cc: devicetree at vger.kernel.org

There is a few mistakes that originate from my original patch - sorry.

> ---
>  .../bindings/display/ingenic-jz4780-hdmi.yaml | 82 +++++++++++++++++++
>  1 file changed, 82 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..a545ff8704eb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/ingenic-jz4780-hdmi.yaml
> @@ -0,0 +1,82 @@
> +# 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 at 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#
panel-common is only supposed to be used by panels.
There is a few users in display/ but this is bindings that are
candidates to be moved to panel/ - and this binding describes a
display controller and not a panel.

> +
> +properties:
> +  compatible:
> +    items:
> +      - const: ingenic,jz4780-hdmi
> +
> +  reg:
> +    maxItems: 1
> +    description: the address & size of the LCD controller registers
> +
> +  reg-io-width:
> +    const: 4
> +
> +  interrupts:
> +    maxItems: 1
> +    description: Specifies the interrupt provided by parent
> +
> +  clocks:
> +    maxItems: 2
> +    description: Clock specifiers for isrf and iahb clocks
> +
> +  clock-names:
> +    items:
> +      - const: isfr
> +      - const: iahb
> +
> +  ddc-i2c-bus: true
> +  ports: true
As we no longer rely on panel-common this needs to be fully specified -
for example like this:

  ddc-i2c-bus:
    $ref: /schemas/types.yaml#/definitions/phandle
    description: phandle to the I2C bus that is connected to DDC

  ports:
    type: object
    description: |
      A ports node with endpoint definitions as defined in
      Documentation/devicetree/bindings/media/video-interfaces.txt.


Thanks for taking care of this binding.

	Sam


> +
> +required:
> +    - compatible
> +    - clocks
> +    - clock-names
> +    - ports
> +    - reg-io-width
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/jz4780-cgu.h>
> +
> +    hdmi: hdmi at 10180000 {
> +        compatible = "ingenic,jz4780-hdmi";
> +        reg = <0x10180000 0x8000>;
> +        reg-io-width = <4>;
> +        ddc-i2c-bus = <&i2c4>;
> +        interrupt-parent = <&intc>;
> +        interrupts = <3>;
> +        clocks = <&cgu JZ4780_CLK_HDMI>, <&cgu JZ4780_CLK_AHB0>;
> +        clock-names = "isfr", "iahb";
> +
> +        ports {
> +            hdmi_in: port {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                hdmi_in_lcd: endpoint at 0 {
> +                    reg = <0>;
> +                    remote-endpoint = <&jz4780_out_hdmi>;
> +                };
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.25.1
> 
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