linux-kernel - Re: [PATCH 2/2] arm: dts: stm32f769-disco: Enable MIPI DSI display support

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Message-ID: <3efb57a1-283b-f2f0-66a4-97e88c6c02d6@st.com>
Date:   Mon, 27 Apr 2020 10:28:35 +0200
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Adrian Pop <pop.adrian61@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm: dts: stm32f769-disco: Enable MIPI DSI display
 support

Hi Adrian

On 4/24/20 8:21 PM, Adrian Pop wrote:
> STM32f769-disco features a 4" MIPI DSI display: add support for it.
> 
> Signed-off-by: Adrian Pop <pop.adrian61@...il.com>
> ---

Commit title should be ARM: dts: stm32: ...

Can you explain a bit more in your commit message why do you use a 
reserved memory pool for DMA and where this pool is located. (I assume 
it's linked to a story of DMA and cache memory attribute on cortexM7...)

Did you try this configuration with XIP boot ?

regards
alex

>   arch/arm/boot/dts/stm32f746.dtsi      | 34 ++++++++++++++++++
>   arch/arm/boot/dts/stm32f769-disco.dts | 50 +++++++++++++++++++++++++++
>   2 files changed, 84 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32f746.dtsi b/arch/arm/boot/dts/stm32f746.dtsi
> index 93c063796780..202bb6edc9f1 100644
> --- a/arch/arm/boot/dts/stm32f746.dtsi
> +++ b/arch/arm/boot/dts/stm32f746.dtsi
> @@ -48,6 +48,19 @@ / {
>   	#address-cells = <1>;
>   	#size-cells = <1>;
>   
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		linux,dma {
> +			compatible = "shared-dma-pool";
> +			linux,dma-default;
> +			no-map;
> +			size = <0x10F000>;
> +		};
> +	};
> +
>   	clocks {
>   		clk_hse: clk-hse {
>   			#clock-cells = <0>;
> @@ -75,6 +88,27 @@ clk_i2s_ckin: clk-i2s-ckin {
>   	};
>   
>   	soc {
> +		ltdc: display-controller@...16800 {
> +			compatible = "st,stm32-ltdc";
> +			reg = <0x40016800 0x200>;
> +			interrupts = <88>, <89>;
> +			resets = <&rcc STM32F7_APB2_RESET(LTDC)>;
> +			clocks = <&rcc 1 CLK_LCD>;
> +			clock-names = "lcd";
> +			status = "disabled";
> +		};
> +
> +		dsi: dsi@...16c00 {
> +			compatible = "st,stm32-dsi";
> +			reg = <0x40016c00 0x800>;
> +			interrupts = <98>;
> +			clocks = <&rcc 1 CLK_F769_DSI>, <&clk_hse>;
> +			clock-names = "pclk", "ref";
> +			resets = <&rcc STM32F7_APB2_RESET(DSI)>;
> +			reset-names = "apb";
> +			status = "disabled";
> +		};
> +
>   		timer2: timer@...00000 {
>   			compatible = "st,stm32-timer";
>   			reg = <0x40000000 0x400>;
> diff --git a/arch/arm/boot/dts/stm32f769-disco.dts b/arch/arm/boot/dts/stm32f769-disco.dts
> index 1626e00bb2cb..30ebbc193e82 100644
> --- a/arch/arm/boot/dts/stm32f769-disco.dts
> +++ b/arch/arm/boot/dts/stm32f769-disco.dts
> @@ -153,3 +153,53 @@ &usbotg_hs {
>   	pinctrl-names = "default";
>   	status = "okay";
>   };
> +
> +&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_in_panel>;
> +			};
> +		};
> +
> +	};
> +
> +	panel: panel {
> +		compatible = "orisetech,otm8009a";
> +		reg = <0>; /* dsi virtual channel (0..3) */
> +		reset-gpios = <&gpioj 15 GPIO_ACTIVE_LOW>;
> +		status = "okay";
> +
> +		port {
> +			dsi_in_panel: endpoint {
> +				remote-endpoint = <&dsi_out>;
> +			};
> +		};
> +	};
> +};
> +
> +&ltdc {
> +	dma-ranges;
> +	status = "okay";
> +
> +	port {
> +		ltdc_out_dsi: endpoint {
> +			remote-endpoint = <&dsi_in>;
> +		};
> +	};
> +};
>