linux-kernel - Re: [PATCH v2 8/8] ARM: dts: sun6i: hummingbird-a31: Enable display output through VGA bridge

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Date:   Tue, 25 Oct 2016 13:43:33 +0530
From:   Archit Taneja <architt@...eaurora.org>
To:     Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 8/8] ARM: dts: sun6i: hummingbird-a31: Enable display
 output through VGA bridge



On 10/20/2016 09:13 AM, Chen-Yu Tsai wrote:
> The Hummingbird A31 board has a RGB-to-VGA bridge which converts RGB
> output from the LCD interface to VGA signals.
>
> Enable this part of the display pipeline.

I couldn't find the enable-gpios binding for the bridge that you
introduced in the previous patch. Is that intentional?

Thanks,
Archit

>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  arch/arm/boot/dts/sun6i-a31-hummingbird.dts | 56 +++++++++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun6i-a31-hummingbird.dts b/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> index 9a74637f677f..05a49b2147f1 100644
> --- a/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> +++ b/arch/arm/boot/dts/sun6i-a31-hummingbird.dts
> @@ -63,6 +63,49 @@
>  		stdout-path = "serial0:115200n8";
>  	};
>
> +	bridge {
> +		compatible = "dumb-vga-dac";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				reg = <0>;
> +
> +				vga_bridge_in: endpoint@0 {
> +					reg = <0>;
> +					remote-endpoint = <&tcon0_out_vga>;
> +				};
> +			};
> +
> +			port@1 {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				reg = <1>;
> +
> +				vga_bridge_out: endpoint@0 {
> +					reg = <0>;
> +					remote-endpoint = <&vga_con_in>;
> +				};
> +			};
> +		};
> +	};
> +
> +	vga {
> +		compatible = "vga-connector";
> +
> +		port {
> +			vga_con_in: endpoint {
> +				remote-endpoint = <&vga_bridge_out>;
> +			};
> +		};
> +	};
> +
>  	wifi_pwrseq: wifi_pwrseq {
>  		compatible = "mmc-pwrseq-simple";
>  		reset-gpios = <&pio 6 10 GPIO_ACTIVE_LOW>; /* PG10 */
> @@ -245,6 +288,19 @@
>  	status = "okay";
>  };
>
> +&tcon0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&lcd0_rgb888_pins>;
> +	status = "okay";
> +};
> +
> +&tcon0_out {
> +	tcon0_out_vga: endpoint@0 {
> +		reg = <0>;
> +		remote-endpoint = <&vga_bridge_in>;
> +	};
> +};
> +
>  &uart0 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&uart0_pins_a>;
>

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