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Date:   Fri, 22 Nov 2019 17:57:31 -0600
From:   Rob Herring <robh@kernel.org>
To:     allen <allen.chen@ite.com.tw>
Cc:     Mark Rutland <mark.rutland@arm.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, Pi-Hsun Shih <pihsun@chromium.org>,
        Jau-Chih Tseng <Jau-Chih.Tseng@ite.com.tw>,
        David Airlie <airlied@linux.ie>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 3/4] dt-bindings: Add binding for IT6505.
Message-ID: <20191122235731.GB7738@bogus>
References: <1573811564-320-1-git-send-email-allen.chen@ite.com.tw>
 <1573811564-320-4-git-send-email-allen.chen@ite.com.tw>
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On Fri, Nov 15, 2019 at 05:52:19PM +0800, allen wrote:
> From: Allen Chen <allen.chen@ite.com.tw>
> 
> Add a DT binding documentation for IT6505.
> 
> Signed-off-by: Allen Chen <allen.chen@ite.com.tw>
> Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org>
> ---
>  .../bindings/display/bridge/ite,it6505.txt         | 28 ++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/ite,it6505.txt

Please make this a DT schema. See 
Documentation/devicetree/writing-schema.rst.
 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.txt b/Documentation/devicetree/bindings/display/bridge/ite,it6505.txt
> new file mode 100644
> index 00000000..72da0c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.txt
> @@ -0,0 +1,28 @@
> +iTE it6505 DP bridge bindings
> +
> +Required properties:
> +        - compatible: "ite,it6505"
> +        - reg: i2c address of the bridge
> +        - ovdd-supply: I/O voltage
> +        - pwr18-supply: Core voltage
> +        - interrupts: interrupt specifier of INT pin
> +        - reset-gpios: gpio specifier of RESET pin
> +	- hpd-gpios:
> +		Hotplug detect GPIO.
> +		Indicates which GPIO should be used for hotplug detection

Indentation is not consistent.

> +	- port@[x]: SoC specific port nodes with endpoint definitions as defined
> +		in Documentation/devicetree/bindings/display/mediatek/mediatek,dpi.txt

You need to define what each port is. With the schema, that will be 
'port@0' and 'port@1' properties.

> +
> +Example:
> +	dp-bridge@5c {
> +                compatible = "ite,it6505";
> +                interrupts = <152 IRQ_TYPE_EDGE_RISING 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>;
> +                hpd-gpios = <&pio 9 0>;
> +                extcon = <&usbc_extcon>;

Not documented plus it's deprecated.

You're missing ports here and they are required.

Rob