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From: "Andreas Färber" <afaerber@suse.de>
To: Chester Lin <clin@suse.com>, Rob Herring <robh+dt@kernel.org>,
	s32@nxp.com
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-serial@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Shawn Guo <shawnguo@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Oleksij Rempel <linux@rempel-privat.de>,
	Stefan Riedmueller <s.riedmueller@phytec.de>,
	Matthias Schiffer <matthias.schiffer@ew.tq-group.com>,
	Li Yang <leoyang.li@nxp.com>, Fabio Estevam <festevam@gmail.com>,
	Matteo Lisi <matteo.lisi@engicam.com>,
	Frieder Schrempf <frieder.schrempf@kontron.de>,
	Tim Harvey <tharvey@gateworks.com>,
	Jagan Teki <jagan@amarulasolutions.com>,
	catalin-dan.udma@nxp.com, bogdan.hamciuc@nxp.com,
	bogdan.folea@nxp.com, ciprianmarian.costea@nxp.com,
	radu-nicolae.pirea@nxp.com, ghennadi.procopciuc@nxp.com,
	Matthias Brugger <matthias.bgg@gmail.com>,
	"Ivan T . Ivanov" <iivanov@suse.de>,
	"Lee, Chun-Yi" <jlee@suse.com>
Subject: Re: [PATCH 7/8] arm64: dts: s32g2: add memory nodes for evb and rdb2
Date: Thu, 12 Aug 2021 20:25:00 +0200	[thread overview]
Message-ID: <17ab7b71-2dbe-0c66-e180-4cc2e8310441@suse.de> (raw)
In-Reply-To: <20210805065429.27485-8-clin@suse.com>

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@suse.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@80000000 {
> +		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@80000000 {
> +		device_type = "memory";
> +		/* 4GB RAM */
> +		reg = <0 0x80000000 0 0x80000000>,
> +		      <8 0x80000000 0 0x80000000>;
> +	};

Same comments as for EVB.

>  };
>  
>  &uart0 {

Regards,
Andreas

-- 
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer
HRB 36809 (AG Nürnberg)

  reply	other threads:[~2021-08-12 18:25 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05  6:54 [PATCH 0/8] arm64: dts: initial NXP S32G2 support Chester Lin
2021-08-05  6:54 ` [PATCH 1/8] dt-bindings: arm: fsl: add NXP S32G2 boards Chester Lin
2021-08-12 15:46   ` Andreas Färber
2021-08-13 17:49     ` Rob Herring
2021-08-13 17:53   ` Rob Herring
2021-08-18 14:34     ` Chester Lin
2021-09-06 20:38       ` Andreas Färber
2021-09-07  6:59         ` Krzysztof Kozlowski
2021-09-07  8:59           ` Andreas Färber
2021-09-06 19:35     ` Andreas Färber
2021-08-05  6:54 ` [PATCH 2/8] dt-bindings: serial: fsl-linflexuart: convert to json-schema format Chester Lin
2021-08-12 16:04   ` Andreas Färber
2021-08-13 11:11     ` Chester Lin
2021-08-13 11:28       ` Krzysztof Kozlowski
2021-08-13 11:43         ` Chester Lin
2021-08-13 18:04           ` Rob Herring
2021-08-13 18:07   ` Rob Herring
2021-08-05  6:54 ` [PATCH 3/8] dt-bindings: serial: fsl-linflexuart: Add compatible for S32G2 Chester Lin
2021-08-12 16:27   ` Andreas Färber
2021-08-13 14:27     ` Radu Nicolae Pirea (NXP OSS)
2021-08-13 18:11     ` Rob Herring
2021-08-13 18:09   ` Rob Herring
2021-08-05  6:54 ` [PATCH 4/8] arm64: dts: add NXP S32G2 support Chester Lin
2021-08-12 17:26   ` Andreas Färber
2021-08-13  3:28     ` Chester Lin
2021-08-13  7:05       ` Andreas Färber
2021-08-20 13:12     ` Marc Zyngier
2021-08-20 15:15       ` Chester Lin
2021-08-20 15:29         ` Marc Zyngier
2021-08-21 12:39           ` Chester Lin
2021-08-21 14:20             ` Marc Zyngier
2021-08-05  6:54 ` [PATCH 5/8] arm64: dts: s32g2: add serial/uart support Chester Lin
2021-08-12 17:42   ` Andreas Färber
2021-08-13  9:54     ` Radu Nicolae Pirea (NXP OSS)
2021-08-05  6:54 ` [PATCH 6/8] arm64: dts: s32g2: add VNP-EVB and VNP-RDB2 support Chester Lin
2021-08-12 18:00   ` Andreas Färber
2021-08-13  8:47     ` Chester Lin
2021-08-05  6:54 ` [PATCH 7/8] arm64: dts: s32g2: add memory nodes for evb and rdb2 Chester Lin
2021-08-12 18:25   ` Andreas Färber [this message]
2021-08-13 14:58     ` Chester Lin
2021-08-05  6:54 ` [PATCH 8/8] MAINTAINERS: Add an entry for NXP S32G2 boards Chester Lin
2021-08-05  7:49   ` Krzysztof Kozlowski
2021-08-09  8:03     ` Shawn Guo
2021-08-12 15:30       ` Andreas Färber
2021-08-12 15:54         ` Krzysztof Kozlowski
2021-08-09  8:06 ` [PATCH 0/8] arm64: dts: initial NXP S32G2 support Shawn Guo

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