linux-kernel - Re: [PATCH v10 02/21] dt-bindings: mediatek,dp: Add Display Port binding

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Date:   Tue, 24 May 2022 11:35:46 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Guillaume Ranquet <granquet@...libre.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        "Vinod Koul" <vkoul@...nel.org>, Helge Deller <deller@....de>,
        CK Hu <ck.hu@...iatek.com>, Jitao shi <jitao.shi@...iatek.com>
CC:     Markus Schneider-Pargmann <msp@...libre.com>,
        <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>
Subject: Re: [PATCH v10 02/21] dt-bindings: mediatek,dp: Add Display Port
 binding

On Mon, 2022-05-23 at 12:47 +0200, 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>
> ---
>  .../display/mediatek/mediatek,dp.yaml         | 99
> +++++++++++++++++++
>  1 file changed, 99 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..36ae0a6df299
> --- /dev/null
> +++
> b/Documentation/devicetree/bindings/display/mediatek/mediatek,dp.yaml
> @@ -0,0 +1,99 @@
> +# 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
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: faxi clock
> +
> +  clock-names:
> +    items:
> +      - const: faxi
> +
> +  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
> +
> +  max-lanes:
> +    maxItems: 1
> +    description: maximum number of lanes supported by the hardware
> +
> +  max-linkrate:
> +    maxItems: 1
> +    description: maximum link rate supported by the hardware
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - ports
> +  - max-lanes
> +  - max-linkrate
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/power/mt8195-power.h>
> +    edp_tx: edp_tx@...00000 {
'edp_tx: ' can be removed

> +        compatible = "mediatek,mt8195-dp-tx";
> +        reg = <0 0x1c500000 0 0x8000>;
reg = <0x1c500000 0x8000>;
#address-cells, #size-cells are both 1 by default

> +        interrupts = <GIC_SPI 676 IRQ_TYPE_LEVEL_HIGH 0>;
> +        power-domains = <&spm MT8195_POWER_DOMAIN_EPD_TX>;
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&edp_pin>;
> +        max-lanes = /bits/ 8 <4>;
> +        max-linkrate = /bits/ 8 <0x1e>;
> +
> +        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>;
> +                };
> +            };
> +        };
> +    };