linux-kernel - Re: [PATCH v8 2/3] dt-bindings: Add binding for IT6505.

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Date:   Thu, 26 Mar 2020 13:10:12 -0600
From:   Rob Herring <robh@...nel.org>
To:     allen <allen.chen@....com.tw>
Cc:     Pi-Hsun Shih <pihsun@...omium.org>,
        Jau-Chih Tseng <Jau-Chih.Tseng@....com.tw>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 2/3] dt-bindings: Add binding for IT6505.

On Mon, Mar 23, 2020 at 01:21:53PM +0800, allen wrote:
> Add a DT binding documentation for IT6505.
> 
> Acked-by: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: Allen Chen <allen.chen@....com.tw>
> Signed-off-by: Pi-Hsun Shih <pihsun@...omium.org>
> ---
> cros-ec does not have an associated driver that uses the standard Linux USB-C driver class.
> extcon is used to model the Type-C connector.(crbug.com/982932)

That's nice, but doesn't matter for upstream. And sounds like a driver 
problem, not a binding issue.

> ---
>  .../bindings/display/bridge/ite,it6505.yaml        | 91 ++++++++++++++++++++++
>  1 file changed, 91 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> new file mode 100644
> index 00000000..13feeef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/bridge/ite,it6505.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ITE it6505 Device Tree Bindings
> +
> +maintainers:
> +  - Allen Chen <allen.chen@....com.tw>
> +
> +description: |
> +  The IT6505 is a high-performance DisplayPort 1.1a transmitter,
> +  fully compliant with DisplayPort 1.1a, HDCP 1.3 specifications.
> +  The IT6505 supports color depth of up to 36 bits (12 bits/color)
> +  and ensures robust transmission of high-quality uncompressed video
> +  content, along with uncompressed and compressed digital audio content.
> +
> +  Aside from the various video output formats supported, the IT6505
> +  also encodes and transmits up to 8 channels of I2S digital audio,
> +  with sampling rate up to 192kHz and sample size up to 24 bits.
> +  In addition, an S/PDIF input port takes in compressed audio of up to
> +  192kHz frame rate.
> +
> +  Each IT6505 chip comes preprogrammed with an unique HDCP key,
> +  in compliance with the HDCP 1.3 standard so as to provide secure
> +  transmission of high-definition content. Users of the IT6505 need not
> +  purchase any HDCP keys or ROMs.
> +
> +properties:
> +  compatible:
> +    const: ite,it6505
> +
> +  ovdd-supply:
> +    maxItems: 1
> +    description: I/O voltage
> +
> +  pwr18-supply:
> +    maxItems: 1
> +    description: core voltage
> +
> +  interrupts:
> +    maxItems: 1
> +    description: interrupt specifier of INT pin
> +
> +  reset-gpios:
> +    maxItems: 1
> +    description: gpio specifier of RESET pin
> +
> +  extcon:

Think I said this already, but don't use extcon and define an output 
port to a DP or USB connector.

> +    maxItems: 1
> +    description: extcon specifier for the Power Delivery
> +
> +  port:
> +    type: object
> +    description: A port node pointing to DPI host port node
> +
> +required:
> +  - compatible
> +  - ovdd-supply
> +  - pwr18-supply
> +  - interrupts
> +  - reset-gpios
> +  - extcon
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c3 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        dp-bridge@5c {
> +            compatible = "ite,it6505";
> +            interrupts = <152 IRQ_TYPE_EDGE_FALLING 152 0>;
> +            reg = <0x5c>;
> +            pinctrl-names = "default";
> +            pinctrl-0 = <&it6505_pins>;
> +            ovdd-supply = <&mt6358_vsim1_reg>;
> +            pwr18-supply = <&it6505_pp18_reg>;
> +            reset-gpios = <&pio 179 1>;
> +            extcon = <&usbc_extcon>;
> +
> +            port {
> +                it6505_in: endpoint {
> +                    remote-endpoint = <&dpi_out>;
> +                };
> +            };
> +        };
> +    };
> -- 
> 1.9.1
>