linux-kernel - Re: [PATCH v3 1/2] ARM: dts: da850-lcdk: add the dumb-vga-dac node

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Date:   Mon, 5 Dec 2016 14:49:50 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Sekhar Nori <nsekhar@...com>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Russell King <linux@...linux.org.uk>
CC:     LKML <linux-kernel@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-drm <dri-devel@...ts.freedesktop.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        Jyri Sarha <jsarha@...com>, David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v3 1/2] ARM: dts: da850-lcdk: add the dumb-vga-dac node

On 29/11/16 13:57, Bartosz Golaszewski wrote:
> Add the dumb-vga-dac node to the board DT together with corresponding
> ports and vga connector. This allows to retrieve the edid info from
> the display automatically.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
> ---
>  arch/arm/boot/dts/da850-lcdk.dts | 58 ++++++++++++++++++++++++++++++++++++++++
>  arch/arm/boot/dts/da850.dtsi     | 17 ++++++++++++
>  2 files changed, 75 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/da850-lcdk.dts b/arch/arm/boot/dts/da850-lcdk.dts
> index 711b9ad..d864f11 100644
> --- a/arch/arm/boot/dts/da850-lcdk.dts
> +++ b/arch/arm/boot/dts/da850-lcdk.dts
> @@ -50,6 +50,53 @@
>  			system-clock-frequency = <24576000>;
>  		};
>  	};
> +
> +	vga_bridge {
> +		compatible = "dumb-vga-dac";
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&lcd_pins>;
> +		#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 = <&display_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";
> +
> +		ddc-i2c-bus = <&i2c0>;
> +
> +		port {
> +			vga_con_in: endpoint {
> +				remote-endpoint = <&vga_bridge_out>;
> +			};
> +		};
> +	};
>  };
>  
>  &pmx_core {
> @@ -235,3 +282,14 @@
>  &memctrl {
>  	status = "okay";
>  };
> +
> +&display {
> +	status = "okay";
> +};
> +
> +&display_out {
> +	display_out_vga: endpoint@0 {
> +		reg = <0>;
> +		remote-endpoint = <&vga_bridge_in>;
> +	};
> +};
> diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
> index 4070619..5f4ba2e 100644
> --- a/arch/arm/boot/dts/da850.dtsi
> +++ b/arch/arm/boot/dts/da850.dtsi
> @@ -454,6 +454,23 @@
>  			reg = <0x213000 0x1000>;
>  			interrupts = <52>;
>  			status = "disabled";
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				display_in: port@0 {
> +					#address-cells = <1>;
> +					#size-cells = <0>;
> +					reg = <0>;
> +				};
> +
> +				display_out: port@1 {
> +					#address-cells = <1>;
> +					#size-cells = <0>;
> +					reg = <1>;
> +				};
> +			};
>  		};

It's a bit difficult to follow this as there's been so many patches
going around. But I take the above is the LCDC node in the base da850
dtsi file? In that case, what is the display_in supposed to present?
It's the first node in the "display chain", so it has no input.

Also, don't touch da850.dtsi here, just add the "ports" node in the
da850-lcdk.dts file.

If the da850.dtsi has not been merged yet, I'd change the name of the
lcdc node to something else than "display". It's rather vague. If it's
named "lcdc", reading da850-lcdk.dts becomes much easier, as you'll
refer to "lcdc".

 Tomi



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