linux-kernel - Re: [PATCH 02/22] dt-bindings: mediatek,dp: Add Display Port binding

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Message-ID: <21791df4-d983-36a1-001d-42a3176e9700@kernel.org>
Date:   Fri, 25 Mar 2022 18:43:17 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Guillaume Ranquet <granquet@...libre.com>, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, airlied@...ux.ie, daniel@...ll.ch,
        robh+dt@...nel.org, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, tzimmermann@...e.de, matthias.bgg@...il.com,
        chunfeng.yun@...iatek.com, kishon@...com, vkoul@...nel.org,
        deller@....de, ck.hu@...iatek.com, jitao.shi@...iatek.com,
        angelogioacchino.delregno@...labora.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, linux-fbdev@...r.kernel.org,
        markyacoub@...gle.com,
        Markus Schneider-Pargmann <msp@...libre.com>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 02/22] dt-bindings: mediatek,dp: Add Display Port binding

On 25/03/2022 18:14, Guillaume Ranquet wrote:
> From: Markus Schneider-Pargmann <msp@...libre.com>
> 
> This controller is present on several mediatek hardware. Currently
> mt8195 and mt8395 have this controller without a functional difference,
> so only one compatible field is added.
> 
> The controller can have two forms, as a normal display port and as an
> embedded display port.
> 
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
> ---
>  .../display/mediatek/mediatek,dp.yaml         | 97 +++++++++++++++++++
>  1 file changed, 97 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> new file mode 100644
> index 000000000000..74db5c4e0f73
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> @@ -0,0 +1,97 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/mediatek/mediatek,dp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Mediatek Display Port Controller
> +
> +maintainers:
> +  - CK Hu <ck.hu@...iatek.com>
> +  - Jitao shi <jitao.shi@...iatek.com>
> +
> +description: |
> +  Device tree bindings for the Mediatek (embedded) Display Port controller
> +  present on some Mediatek SoCs.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - mediatek,mt8195-dp-tx
> +      - syscon

This is wrong, should be a list. Are you sure you got Rob's review? I
see now v8 with his Reviewed-by tag, but without syscon, so he looked at
something else.

Please drop his tag and please test your changes. This would be easily
spotted with dt_binding_check.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: faxi clock
> +
> +  clock-names:
> +    items:
> +      - const: faxi
> +
> +  phys:
> +    maxItems: 1
> +
> +  phy-names:
> +    items:
> +      - const: dp
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Input endpoint of the controller, usually dp_intf
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/properties/port
> +        description: Output endpoint of the controller

None of the ports are required?

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - ports
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/power/mt8195-power.h>
> +    edp_tx: edp_tx@...00000 {

generic node name, so I guess "dp" as display-port.

> +        compatible = "mediatek,mt8195-dp-tx","syscon";
> +        reg = <0 0x1c500000 0 0x8000>;
> +        interrupts = <GIC_SPI 676 IRQ_TYPE_LEVEL_HIGH 0>;
> +        power-domains = <&spm MT8195_POWER_DOMAIN_EPD_TX>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&edp_pin>;
> +        phys = <&dp_phy>;
> +        phy-names = "dp";
> +
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                reg = <0>;
> +                edp_in: endpoint {
> +                    remote-endpoint = <&dp_intf0_out>;
> +                };
> +            };
> +            port@1 {
> +                reg = <1>;
> +                edp_out: endpoint {
> +                	remote-endpoint = <&panel_in>;
> +                };
> +            };
> +        };
> +    };


Best regards,
Krzysztof