linux-kernel - Re: [PATCH 7/8] arm64: dts: s32g2: add memory nodes for evb and rdb2

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Message-ID: <17ab7b71-2dbe-0c66-e180-4cc2e8310441@suse.de>
Date:   Thu, 12 Aug 2021 20:25:00 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     Chester Lin <clin@...e.com>, Rob Herring <robh+dt@...nel.org>,
        s32@....com
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Stefan Riedmueller <s.riedmueller@...tec.de>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Li Yang <leoyang.li@....com>,
        Fabio Estevam <festevam@...il.com>,
        Matteo Lisi <matteo.lisi@...icam.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Tim Harvey <tharvey@...eworks.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        catalin-dan.udma@....com, bogdan.hamciuc@....com,
        bogdan.folea@....com, ciprianmarian.costea@....com,
        radu-nicolae.pirea@....com, ghennadi.procopciuc@....com,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Ivan T . Ivanov" <iivanov@...e.de>, "Lee, Chun-Yi" <jlee@...e.com>
Subject: Re: [PATCH 7/8] arm64: dts: s32g2: add memory nodes for evb and rdb2

Hi Chester et al.,

On 05.08.21 08:54, Chester Lin wrote:
> Add memory nodes for S32G-VNP-EVB and S32G-VNP-RDB2 since they have fixed
> RAM size.

You can drop "since they have fixed RAM size" - if they didn't, you
would simply choose the lowest size and rely on the bootloader (U-Boot)
to overwrite it with the actually detected size.

Please expand why this patch is separate - BSP based, I assume?

> 
> Signed-off-by: Chester Lin <clin@...e.com>
> ---
>  arch/arm64/boot/dts/freescale/s32g274a-evb.dts  | 8 ++++++++
>  arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts | 8 ++++++++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/s32g274a-evb.dts b/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
> index a1ae5031730a..cd41f0af5dd8 100644
> --- a/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
> +++ b/arch/arm64/boot/dts/freescale/s32g274a-evb.dts
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
>  /*
>   * Copyright (c) 2021 SUSE LLC
> + * Copyright 2019-2020 NXP

@NXP: Please review year, alignment. Do any Signed-off-bys apply?

>   */
>  
>  /dts-v1/;
> @@ -14,6 +15,13 @@ / {
>  	chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
> +
> +	memory@...00000 {
> +		device_type = "memory";
> +		/* 4GB RAM */

This looks strange to me - either put /* 4 GiB RAM */ before the node,
three lines above, and/or append comment /* 2 GiB */ on each line below.
Note the space, and suggest to be precise about factor 1024 vs. 1000.

> +		reg = <0 0x80000000 0 0x80000000>,

Note that this gives you the range to use for the .dtsi /soc node:
Address 0x0 with size 0x80000000 gets mapped to 0x0 0x0, excluding the
upper 0x80000000 for the RAM here. Or address 0x0 0x0 for two /soc cells
if there are high-memory peripherals.

> +		      <8 0x80000000 0 0x80000000>;

Maybe use 0x8 here and 0x0 above? (second 0 stays same, so don't mind)

> +	};
>  };
>  
>  &uart0 {
> diff --git a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> index b2faae306b70..8fbbf3b45eb8 100644
> --- a/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> +++ b/arch/arm64/boot/dts/freescale/s32g274a-rdb2.dts
> @@ -1,6 +1,7 @@
>  // SPDX-License-Identifier: GPL-2.0-or-later OR MIT
>  /*
>   * Copyright (c) 2021 SUSE LLC
> + * Copyright 2019-2020 NXP

@NXP: 2021?

>   */
>  
>  /dts-v1/;
> @@ -14,6 +15,13 @@ / {
>  	chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
> +
> +	memory@...00000 {
> +		device_type = "memory";
> +		/* 4GB RAM */
> +		reg = <0 0x80000000 0 0x80000000>,
> +		      <8 0x80000000 0 0x80000000>;
> +	};

Same comments as for EVB.

>  };
>  
>  &uart0 {

Regards,
Andreas

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