linux-kernel - RE: [PATCH] arm64: dts: renesas: r8a77951: Add reserved memory region

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Message-ID: <OS0PR01MB5922888E58D92CF72ABC95EB86059@OS0PR01MB5922.jpnprd01.prod.outlook.com>
Date:   Mon, 14 Nov 2022 19:56:04 +0000
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Detlev Casanova <detlev.casanova@...labora.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marek Vasut <marex@...x.de>
CC:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "open list:ARM/RENESAS ARCHITECTURE" 
        <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: RE: [PATCH] arm64: dts: renesas: r8a77951: Add reserved memory region



> -----Original Message-----
> From: Detlev Casanova <detlev.casanova@...labora.com>
> Sent: 14 November 2022 19:49
> To: linux-kernel@...r.kernel.org
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>; Magnus Damm
> <magnus.damm@...il.com>; Rob Herring <robh+dt@...nel.org>; Krzysztof
> Kozlowski <krzysztof.kozlowski+dt@...aro.org>; open list:ARM/RENESAS
> ARCHITECTURE <linux-renesas-soc@...r.kernel.org>; open list:OPEN
> FIRMWARE AND FLATTENED DEVICE TREE BINDINGS
> <devicetree@...r.kernel.org>; Detlev Casanova
> <detlev.casanova@...labora.com>
> Subject: [PATCH] arm64: dts: renesas: r8a77951: Add reserved memory
> region
> 
> The 0x3000000 bytes memory region starting at 0x54000000 is reserved
> for the lossy_decompression hardware that will try to decompress any
> data written in the region.
> 
> Mark the region as no-map to prevent linux from using it as RAM.
> 
> Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> ---
>  arch/arm64/boot/dts/renesas/r8a77951.dtsi | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/renesas/r8a77951.dtsi
> b/arch/arm64/boot/dts/renesas/r8a77951.dtsi
> index 07c8763c1e77..171833d91313 100644
> --- a/arch/arm64/boot/dts/renesas/r8a77951.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a77951.dtsi
> @@ -290,6 +290,18 @@ CPU_SLEEP_1: cpu-sleep-1 {
>  		};
>  	};
> 
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		/* device specific region for Lossy Decompression */
> +		lossy_decompress: memory-region@...00000 {
> +			no-map;
> +			reg = <0x00000000 0x54000000 0x0 0x03000000>;
> +		};
> +	};

Is not part of TFA[1]?

[1] https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git/tree/plat/renesas/rcar/bl2_plat_setup.c#n174

> +
>  	extal_clk: extal {
>  		compatible = "fixed-clock";
>  		#clock-cells = <0>;
> --
> 2.38.1