linux-kernel - Re: [PATCH 10/12] dt-bindings: drm/bridge: Document Cadence MHDP bridge bindings

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Message-ID: <20180716211440.GA29964@rob-hp-laptop>
Date:   Mon, 16 Jul 2018 15:14:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     Damian Kos <dkos@...ence.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, ltyrala@...ence.com,
        pgaj@...ence.com, stelford@...ence.com
Subject: Re: [PATCH 10/12] dt-bindings: drm/bridge: Document Cadence MHDP
 bridge bindings

On Tue, Jul 03, 2018 at 11:02:21AM +0100, Damian Kos wrote:
> Document the bindings used for the Cadence MHDP DPI/DP bridge.
> 
> Signed-off-by: Damian Kos <dkos@...ence.com>
> ---
>  .../bindings/display/bridge/cdns,mhdp.txt          |   39 ++++++++++++++++++++
>  1 files changed, 39 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/cdns,mhdp.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/cdns,mhdp.txt b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp.txt
> new file mode 100644
> index 0000000..d872e26
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/cdns,mhdp.txt
> @@ -0,0 +1,39 @@
> +Cadence MHDP bridge
> +==========================
> +
> +The Cadence MHDP bridge is a DPI to DP bridge.
> +
> +Required properties:
> + - compatible: should be "cdns,mhdp",

Not very specific. Only 1 version of this block?

> + - reg: physical base address and length of the controller's registers,
> + - clocks: DP bridge clock, it's used by the IP to know how to translate
> +	   a number of clock cycles into a time (which is used to comply
> +	   with DP standard timings and delays),
> + - clock-names: must be "clk",

Not a useful name. With only 1 clock, you can just drop this.

> +
> +Required subnodes:
> + - ports: Ports as described in Documentation/devictree/bindings/graph.txt
> +   Currently contains a single input port at address 0 representing the DPI
> +   input.

Currently? You should have a port connecting to a connector node.

> +   Port 0 should be connected to a DPI encoder output.
> +
> +Example:
> +
> +	mhdp: mhdp@...0fb000000 {

dp-bridge@...b000000

> +		compatible = "cdns,mhdp";
> +		reg = <0xf0 0xfb000000 0x0 0x1000000>;
> +		clocks = <&mhdp_clock>;
> +		clock-names = "clk";
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +				mhdp0_dpi_input: endpoint {
> +					remote-endpoint = <&xxx_dpi_output>;
> +				};
> +			};
> +		};
> +	};
> -- 
> 1.7.1
> 
> --
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