linux-kernel - Re: [PATCH v3 1/3] dt-bindings: display: bridge: add it66121 bindings

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Message-ID: <YHX8cLQyt+LbzqT8@pendragon.ideasonboard.com>
Date:   Tue, 13 Apr 2021 23:17:52 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Neil Armstrong <narmstrong@...libre.com>, a.hajda@...sung.com,
        robert.foss@...aro.org, devicetree@...r.kernel.org,
        jonas@...boo.se, jernej.skrabec@...l.net,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Phong LE <ple@...libre.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: display: bridge: add it66121 bindings

Hi Paul,

On Tue, Apr 13, 2021 at 07:09:17PM +0100, Paul Cercueil wrote:
> Le lun. 12 avril 2021 à 17:46, Neil Armstrong a écrit :
> > From: Phong LE <ple@...libre.com>
> > 
> > Add the ITE bridge HDMI it66121 bindings.
> > 
> > Signed-off-by: Phong LE <ple@...libre.com>
> > Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> > ---
> >  .../bindings/display/bridge/ite,it66121.yaml  | 123 ++++++++++++++++++
> >  1 file changed, 123 insertions(+)
> >  create mode 100644 
> > Documentation/devicetree/bindings/display/bridge/ite,it66121.yaml
> > 
> > diff --git 
> > a/Documentation/devicetree/bindings/display/bridge/ite,it66121.yaml 
> > b/Documentation/devicetree/bindings/display/bridge/ite,it66121.yaml
> > new file mode 100644
> > index 000000000000..61ed6dc7740b
> > --- /dev/null
> > +++ 
> > b/Documentation/devicetree/bindings/display/bridge/ite,it66121.yaml
> > @@ -0,0 +1,123 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/bridge/ite,it66121.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ITE it66121 HDMI bridge Device Tree Bindings
> > +
> > +maintainers:
> > +  - Phong LE <ple@...libre.com>
> > +  - Neil Armstrong <narmstrong@...libre.com>
> > +
> > +description: |
> > +  The IT66121 is a high-performance and low-power single channel HDMI
> > +  transmitter, fully compliant with HDMI 1.3a, HDCP 1.2 and backward 
> > compatible
> > +  to DVI 1.0 specifications.
> > +
> > +properties:
> > +  compatible:
> > +    const: ite,it66121
> > +
> > +  reg:
> > +    maxItems: 1
> > +    description: base I2C address of the device
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +    description: GPIO connected to active low reset
> > +
> > +  vrf12-supply:
> > +    description: Regulator for 1.2V analog core power.
> > +
> > +  vcn33-supply:
> > +    description: Regulator for 3.3V digital core power.
> > +
> > +  vcn18-supply:
> > +    description: Regulator for 1.8V IO core power.
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  ports:
> > +    $ref: /schemas/graph.yaml#/properties/ports
> > +
> > +    properties:
> > +      port@0:
> > +        $ref: /schemas/graph.yaml#/$defs/port-base
> > +        unevaluatedProperties: false
> > +        description: DPI input port.
> > +
> > +        properties:
> > +          endpoint:
> > +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> > +            unevaluatedProperties: false
> > +
> > +            properties:
> > +              bus-width:
> > +                description:
> > +                  Endpoint bus width.
> > +                enum:
> > +                  - 12  # 12 data lines connected and dual-edge mode
> > +                  - 24  # 24 data lines connected and single-edge 
> > mode
> > +                default: 24
> > +
> > +      port@1:
> > +        $ref: /schemas/graph.yaml#/properties/port
> > +        description: HDMI Connector port.
> > +
> > +    required:
> > +      - port@0
> > +      - port@1
> 
> Should port@1 really be required? Since the chip itself handles the 
> hotplug detection and stuff like DCC, I'm not sure what to connect here.

It should be connected to a DT node that models the connector
(Documentation/devicetree/bindings/display/connector/*).

> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - reset-gpios
> > +  - vrf12-supply
> > +  - vcn33-supply
> > +  - vcn18-supply
> > +  - interrupts
> > +  - ports
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      it66121hdmitx: it66121hdmitx@4c {
> > +        compatible = "ite,it66121";
> > +        pinctrl-names = "default";
> > +        pinctrl-0 = <&ite_pins_default>;
> > +        vcn33-supply = <&mt6358_vcn33_wifi_reg>;
> > +        vcn18-supply = <&mt6358_vcn18_reg>;
> > +        vrf12-supply = <&mt6358_vrf12_reg>;
> > +        reset-gpios = <&pio 160 1 /* GPIO_ACTIVE_LOW */>;
> > +        interrupt-parent = <&pio>;
> > +        interrupts = <4 8 /* IRQ_TYPE_LEVEL_LOW */>;
> > +        reg = <0x4c>;
> > +
> > +        ports {
> > +          #address-cells = <1>;
> > +          #size-cells = <0>;
> > +
> > +          port@0 {
> > +            reg = <0>;
> > +            it66121_in: endpoint {
> > +              bus-width = <12>;
> > +              remote-endpoint = <&display_out>;
> > +            };
> > +          };
> > +
> > +          port@1 {
> > +            reg = <1>;
> > +            hdmi_conn_out: endpoint {
> > +              remote-endpoint = <&hdmi_conn_in>;
> > +            };
> > +          };
> > +        };
> > +      };
> > +    };

-- 
Regards,

Laurent Pinchart