linux-kernel - Re: [PATCH v1 1/2] dt-bindings: display: add sc7180 panel variant

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Message-ID: <20191213214719.GA11149@bogus>
Date:   Fri, 13 Dec 2019 15:47:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Harigovindan P <harigovi@...eaurora.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        abhinavk@...eaurora.org, jsanka@...eaurora.org,
        chandanu@...eaurora.org, nganji@...eaurora.org
Subject: Re: [PATCH v1 1/2] dt-bindings: display: add sc7180 panel variant

On Fri, Nov 29, 2019 at 12:25:44PM +0530, Harigovindan P wrote:
> Add a compatible string to support sc7180 panel version.
> 
> Signed-off-by: Harigovindan P <harigovi@...eaurora.org>
> ---
>  .../bindings/display/visionox,rm69299.txt          | 68 ++++++++++++++++++++++
>  1 file changed, 68 insertions(+)
>  create mode 100755 Documentation/devicetree/bindings/display/visionox,rm69299.txt

Source files should not have execute permission.

New bindings should be in DT schema format.

checkpatch.pl will tell you both of these things.

> 
> diff --git a/Documentation/devicetree/bindings/display/visionox,rm69299.txt b/Documentation/devicetree/bindings/display/visionox,rm69299.txt
> new file mode 100755
> index 0000000..4622191
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/visionox,rm69299.txt
> @@ -0,0 +1,68 @@
> +Visionox model RM69299 DSI display driver
> +
> +The Visionox RM69299 is a generic display driver, currently only configured
> +for use in the 1080p display on the Qualcomm SC7180 MTP board.
> +
> +Required properties:
> +- compatible: should be "visionox,rm69299-1080p-display"

RM69299 may be generic, but 1080p sounds like a specific panel.

Is there anything besides a 'display'? If not, '-display' is redundant.

> +- vdda-supply: phandle of the regulator that provides the supply voltage
> +  Power IC supply
> +- vdd3p3-supply: phandle of the regulator that provides the supply voltage
> +  Power IC supply
> +- reset-gpios: phandle of gpio for reset line
> +  This should be 8mA, gpio can be configured using mux, pinctrl, pinctrl-names
> +  (active low)
> +- mode-gpios: phandle of the gpio for choosing the mode of the display
> +  for single DSI

The modes are what?

> +- ports: This device has one video port driven by one DSI. Their connections
> +  are modeled using the OF graph bindings specified in
> +  Documentation/devicetree/bindings/graph.txt.
> +  - port@0: DSI input port driven by master DSI
> +
> +Example:
> +
> +	dsi@...4000 {
> +		panel@0 {
> +			compatible = "visionox,rm69299-1080p-display";
> +			reg = <0>;
> +
> +			vdda-supply = <&src_pp1800_l8c>;
> +			vdd3p3-supply = <&src_pp2800_l18a>;
> +
> +			pinctrl-names = "default", "suspend";
> +			pinctrl-0 = <&disp_pins_default>;
> +			pinctrl-1 = <&disp_pins_default>;
> +
> +			reset-gpios = <&pm6150l_gpios 3 0>;
> +
> +			display-timings {
> +				timing0: timing-0 {
> +					/* originally
> +					 * 268316160 Mhz,
> +					 * but value below fits
> +					 * better w/ downstream
> +					 */
> +					clock-frequency = <158695680>;
> +					hactive = <1080>;
> +					vactive = <2248>;
> +					hfront-porch = <26>;
> +					hback-porch = <36>;
> +					hsync-len = <2>;
> +					vfront-porch = <56>;
> +					vback-porch = <4>;
> +					vsync-len = <4>;
> +				};
> +			};
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				port@0 {
> +					reg = <0>;
> +					panel0_in: endpoint {
> +						remote-endpoint = <&dsi0_out>;
> +					};
> +				};
> +			};
> +		};
> +	};
> -- 
> 2.7.4
>