linux-kernel - Re: [PATCH 2/2] ARM: dts: Add bcm2711-rpi-4-b-7inch-ts-dsi.dts

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Date:   Wed, 9 Feb 2022 18:10:12 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Detlev Casanova <detlev.casanova@...labora.com>,
        linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        "maintainer:ARM AND ARM64 SoC SUB-ARCHITECTURES (COMMON PARTS)" 
        <soc@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:ARM AND ARM64 SoC SUB-ARCHITECTURES (COMMON PARTS)" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] ARM: dts: Add bcm2711-rpi-4-b-7inch-ts-dsi.dts

Hi Detlev,

Am 09.02.22 um 17:25 schrieb Detlev Casanova:
> Add a device tree to support the official Raspberrypi 7" touchscreen for
> the Raspberry Pi 4 B
>
> The panel is connected on the DSI 1 port and uses the simple-panel
> driver.
>
> The device tree also makes sure to activate:
>  * dvp: bcm2711 clock driver
>  * hvs: Hardware Video Scaler
>  * pixelvalve[0-4]: CRTC modules
>  * txp: CRTC Writeback
>
> Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> ---
>  arch/arm/boot/dts/Makefile                    |   1 +
>  .../boot/dts/bcm2711-rpi-4-b-7inch-ts-dsi.dts | 129 ++++++++++++++++++
>  arch/arm64/boot/dts/broadcom/Makefile         |   1 +
>  .../broadcom/bcm2711-rpi-4-b-7inch-ts-dsi.dts |   2 +
>  4 files changed, 133 insertions(+)
>  create mode 100644 arch/arm/boot/dts/bcm2711-rpi-4-b-7inch-ts-dsi.dts
>  create mode 100644 arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b-7inch-ts-dsi.dts
>
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 0de64f237cd8..b46daf2df4ce 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -94,6 +94,7 @@ dtb-$(CONFIG_ARCH_BCM2835) += \
>  	bcm2837-rpi-cm3-io3.dtb \
>  	bcm2711-rpi-400.dtb \
>  	bcm2711-rpi-4-b.dtb \
> +	bcm2711-rpi-4-b-7inch-ts-dsi.dtb \
>  	bcm2711-rpi-cm4-io.dtb \
>  	bcm2835-rpi-zero.dtb \
>  	bcm2835-rpi-zero-w.dtb
> diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b-7inch-ts-dsi.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b-7inch-ts-dsi.dts
> new file mode 100644
> index 000000000000..62e986358c2a
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b-7inch-ts-dsi.dts
i think this should be an overlay because this board can be connected to
different boards and we want to avoid copy & paste. Unfortunately i
don't know where this should be stored in the kernel tree.
> @@ -0,0 +1,129 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include "bcm2711-rpi-4-b.dts"
> +
> +/ {
> +	model = "Raspberry Pi 4 Model B + Rpi 7inch touchscreen";
> +
> +	panel_disp1: panel_disp1@0 {
> +		reg = <0 0 0>;
> +		compatible = "raspberrypi,7inch-dsi", "simple-panel";
> +		backlight = <&reg_display>;
> +		power-supply = <&reg_display>;
> +		status = "okay";
> +
> +		port {
> +			panel_in: endpoint {
> +				remote-endpoint = <&bridge_out>;
> +			};
> +		};
> +	};
> +
> +	reg_bridge: reg_bridge@0 {
> +		reg = <0 0 0>;
> +		compatible = "regulator-fixed";
> +		regulator-name = "bridge_reg";
> +		gpio = <&reg_display 0 0>;
> +		vin-supply = <&reg_display>;
> +		enable-active-high;
> +		status = "okay";
> +	};
> +};
> +
> +&i2c_csi_dsi {
> +	ft5406: ts@38 {
s/ts/touchscreen/
> +		compatible = "edt,edt-ft5506";
> +		reg = <0x38>;
> +		status = "okay";
> +
> +		vcc-supply = <&reg_display>;
> +		reset-gpio = <&reg_display 1 1>;
> +
> +		touchscreen-size-x = < 800 >;
> +		touchscreen-size-y = < 480 >;
> +
> +		touchscreen-inverted-x;
> +		touchscreen-inverted-y;
> +	};
> +
> +	reg_display: reg_display@45 {
node name should be regulator
> +		compatible = "raspberrypi,7inch-touchscreen-panel-regulator";
> +		reg = <0x45>;
> +		gpio-controller;
> +		#gpio-cells = <2>;
> +		status = "okay";
> +	};
> +
> +};
> +
> +&dsi1 {
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	status = "okay";
> +
> +	port {
> +		dsi_out: endpoint {
> +			remote-endpoint = <&bridge_in>;
> +		};
> +	};
> +
> +	bridge@0 {
> +		reg = <0>;
> +		compatible = "toshiba,tc358762";
> +		vddc-supply = <&reg_bridge>;
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +				bridge_in: endpoint {
> +					remote-endpoint = <&dsi_out>;
> +				};
> +			};
> +
> +			port@1 {
> +				reg = <1>;
> +				bridge_out: endpoint {
> +					remote-endpoint = <&panel_in>;
> +				};
> +			};
> +		};
> +	};
> +};
> +
> +&aon_intr {
> +	status = "okay";
> +};
> +
> +&dvp {
> +	status = "okay";
> +};
> +
> +&hvs {
> +	status = "okay";
> +};
>From my understanding these three are not necessary
> +
> +&pixelvalve0 {
> +	status = "okay";
> +};
> +
> +&pixelvalve1 {
> +	status = "okay";
> +};
> +
> +&pixelvalve2 {
> +	status = "okay";
> +};
> +
> +&pixelvalve3 {
> +	status = "okay";
> +};
> +
> +&pixelvalve4 {
> +	status = "okay";
> +};
> +
> +&txp {
> +	status = "okay";
> +};

Also txp doesn't need to be enabled explicit.

Best regards

> diff --git a/arch/arm64/boot/dts/broadcom/Makefile b/arch/arm64/boot/dts/broadcom/Makefile
> index c6882032a428..965361bff829 100644
> --- a/arch/arm64/boot/dts/broadcom/Makefile
> +++ b/arch/arm64/boot/dts/broadcom/Makefile
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  dtb-$(CONFIG_ARCH_BCM2835) += bcm2711-rpi-400.dtb \
>  			      bcm2711-rpi-4-b.dtb \
> +			      bcm2711-rpi-4-b-7inch-ts-dsi.dtb \
>  			      bcm2711-rpi-cm4-io.dtb \
>  			      bcm2837-rpi-3-a-plus.dtb \
>  			      bcm2837-rpi-3-b.dtb \
> diff --git a/arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b-7inch-ts-dsi.dts b/arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b-7inch-ts-dsi.dts
> new file mode 100644
> index 000000000000..c325adc4f874
> --- /dev/null
> +++ b/arch/arm64/boot/dts/broadcom/bcm2711-rpi-4-b-7inch-ts-dsi.dts
> @@ -0,0 +1,2 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "arm/bcm2711-rpi-4-b-7inch-ts-dsi.dts"