linux-kernel - Re: [PATCH v7 4/5] ARM: dts: stm32: add display support on stm32f769-disco

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Message-ID: <3552f3e5-01cc-4e95-a055-f7aea0f8dc4b@foss.st.com>
Date: Fri, 12 Jan 2024 14:52:24 +0100
From: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>,
        <linux-kernel@...r.kernel.org>
CC: Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <linux-amarula@...rulasolutions.com>, Lee Jones <lee@...nel.org>,
        Conor
 Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Maxime Coquelin
	<mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: Re: [PATCH v7 4/5] ARM: dts: stm32: add display support on
 stm32f769-disco


On 1/11/24 12:31, Dario Binacchi wrote:
> The patch adds display support on the stm32f769-disco board.
>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
> ---
>
> (no changes since v1)
>
>  arch/arm/boot/dts/st/stm32f769-disco.dts | 72 +++++++++++++++++++++++-
>  1 file changed, 71 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boot/dts/st/stm32f769-disco.dts b/arch/arm/boot/dts/st/stm32f769-disco.dts
> index 8632bd866272..d1eb5f9c78bf 100644
> --- a/arch/arm/boot/dts/st/stm32f769-disco.dts
> +++ b/arch/arm/boot/dts/st/stm32f769-disco.dts
> @@ -41,7 +41,7 @@
>   */
>  
>  /dts-v1/;
> -#include "stm32f746.dtsi"
> +#include "stm32f769.dtsi"
>  #include "stm32f769-pinctrl.dtsi"
>  #include <dt-bindings/input/input.h>
>  #include <dt-bindings/gpio/gpio.h>
> @@ -60,6 +60,19 @@ memory@...00000 {
>  		reg = <0xC0000000 0x1000000>;
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		linux,dma {
> +			compatible = "shared-dma-pool";
> +			linux,dma-default;
> +			no-map;
> +			size = <0x100000>;
> +		};
> +	};
> +
>  	aliases {
>  		serial0 = &usart1;
>  	};
> @@ -85,6 +98,13 @@ button-0 {
>  		};
>  	};
>  
> +	panel_backlight: panel-backlight {
> +		compatible = "gpio-backlight";
> +		gpios = <&gpioi 14 GPIO_ACTIVE_HIGH>;
> +		default-on;
> +		status = "okay";
> +	};
> +
>  	usbotg_hs_phy: usb-phy {
>  		#phy-cells = <0>;
>  		compatible = "usb-nop-xceiv";
> @@ -114,6 +134,46 @@ &clk_hse {
>  	clock-frequency = <25000000>;
>  };
>  
> +&dsi {
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	status = "okay";
> +
> +	ports {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		port@0 {
> +			reg = <0>;
> +			dsi_in: endpoint {
> +				remote-endpoint = <&ltdc_out_dsi>;
> +			};
> +		};
> +
> +		port@1 {
> +			reg = <1>;
> +			dsi_out: endpoint {
> +				remote-endpoint = <&dsi_panel_in>;
> +			};
> +		};
> +	};
> +
> +	panel0: panel-dsi@0 {
> +		compatible = "orisetech,otm8009a";
> +		reg = <0>; /* dsi virtual channel (0..3) */
> +		reset-gpios = <&gpioj 15 GPIO_ACTIVE_LOW>;
> +		power-supply = <&vcc_3v3>;
> +		backlight = <&panel_backlight>;
> +		status = "okay";
> +
> +		port {
> +			dsi_panel_in: endpoint {
> +				remote-endpoint = <&dsi_out>;
> +			};
> +		};
> +	};
> +};
> +
>  &i2c1 {
>  	pinctrl-0 = <&i2c1_pins_b>;
>  	pinctrl-names = "default";
> @@ -122,6 +182,16 @@ &i2c1 {
>  	status = "okay";
>  };
>  
> +&ltdc {
> +	status = "okay";
> +
> +	port {
> +		ltdc_out_dsi: endpoint@0 {

Hi Dario,

There is no need for unit name on this endpoint since it is alone.

Otherwise it triggers this warning at build time :

../arch/arm/boot/dts/st/stm32f769-disco.dts:189.28-191.5: Warning
(unit_address_vs_reg): /soc/display-controller@...16800/port/endpoint@0: node
has a unit name, but no reg or ranges property

../arch/arm/boot/dts/st/stm32f769-disco.dts:189.28-191.5: Warning
(unit_address_vs_reg): /soc/display-controller@...16800/port/endpoint@0: node
has a unit name, but no reg or ranges property


Regards,

Raphaël

> +			remote-endpoint = <&dsi_in>;
> +		};
> +	};
> +};
> +
>  &rtc {
>  	status = "okay";
>  };