Re: [PATCH v1 04/17] dt-bindings: display: mediatek: add MT8195 hdmi bindings

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 19/09/2022 18:56, Guillaume Ranquet wrote:
> Add mt8195 SoC bindings for hdmi and hdmi-ddc
> 
> Make port1 optional for mt8195 as it only supports HDMI tx for now.
> Requires a ddc-i2c-bus phandle.
> Requires a power-domains phandle.
> 
> Signed-off-by: Guillaume Ranquet <granquet@baylibre.com>
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
> index bdaf0b51e68c..abb231a0694b 100644
> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,hdmi.yaml
> @@ -21,6 +21,10 @@ properties:
>        - mediatek,mt7623-hdmi
>        - mediatek,mt8167-hdmi
>        - mediatek,mt8173-hdmi
> +      - mediatek,mt8195-hdmi
> +
> +  clocks: true
> +  clock-names: true

????
Why is this moved?

>  
>    reg:
>      maxItems: 1
> @@ -28,20 +32,6 @@ properties:
>    interrupts:
>      maxItems: 1
>  
> -  clocks:
> -    items:
> -      - description: Pixel Clock
> -      - description: HDMI PLL
> -      - description: Bit Clock
> -      - description: S/PDIF Clock
> -
> -  clock-names:
> -    items:
> -      - const: pixel
> -      - const: pll
> -      - const: bclk
> -      - const: spdif

Clock definition with constraints should stay here. You just customize
it per variant.

> -
>    phys:
>      maxItems: 1
>  
> @@ -58,6 +48,16 @@ properties:
>      description: |
>        phandle link and register offset to the system configuration registers.
>  
> +  ddc-i2c-bus:
> +    $ref: '/schemas/types.yaml#/definitions/phandle'

Drop quotes

> +    description: Phandle to the ddc-i2c device

Isn't this property of panel?

> +
> +  power-domains:
> +    description:
> +      A phandle and PM domain specifier as defined by bindings
> +      of the power controller specified by phandle. See
> +      Documentation/devicetree/bindings/power/power-domain.yaml for details.

No need for this text. This is standard property. You miss maxItems.


> +
>    ports:
>      $ref: /schemas/graph.yaml#/properties/ports
>  
> @@ -76,7 +76,6 @@ properties:
>  
>      required:
>        - port@0
> -      - port@1
>  
>  required:
>    - compatible
> @@ -86,9 +85,55 @@ required:
>    - clock-names
>    - phys
>    - phy-names
> -  - mediatek,syscon-hdmi
>    - ports
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: mediatek,mt8195-hdmi
> +    then:
> +      properties:
> +        clocks:
> +          items:
> +            - description: APB
> +            - description: HDCP
> +            - description: HDCP 24M
> +            - description: Split HDMI
> +        clock-names:
> +          items:
> +            - const: hdmi_apb_sel
> +            - const: hdcp_sel
> +            - const: hdcp24_sel
> +            - const: split_hdmi

Clocks are entirely different. I am not sure there is benefit in keeping
these devices in one bindings.

> +
> +      required:
> +        - power-domains
> +        - ddc-i2c-bus

Blank line,

> +    else:
> +      properties:
> +        clocks:
> +          items:
> +            - description: Pixel Clock
> +            - description: HDMI PLL
> +            - description: Bit Clock
> +            - description: S/PDIF Clock
> +
> +        clock-names:
> +          items:
> +            - const: pixel
> +            - const: pll
> +            - const: bclk
> +            - const: spdif
> +
> +        ports:
> +          required:
> +            - port@1
> +
> +      required:
> +        - mediatek,syscon-hdmi
> +
>  additionalProperties: false
>  
>  examples:
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml
> new file mode 100644
> index 000000000000..3c80bcebe6d3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/mediatek/mediatek,mt8195-hdmi-ddc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek HDMI DDC Device Tree Bindings for mt8195

Drop Device Tree Bindings

> +
> +maintainers:
> +  - CK Hu <ck.hu@mediatek.com>
> +  - Jitao shi <jitao.shi@mediatek.com>
> +
> +description: |
> +  The HDMI DDC i2c controller is used to interface with the HDMI DDC pins.

Why is this different than existing ddc bindings?

> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt8195-hdmi-ddc
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    items:
> +      - const: ddc-i2c
> +
> +required:
> +  - compatible
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    hdmiddc0: ddc_i2c {

No underscores in node names. Generic node names.


Best regards,
Krzysztof