linux-kernel - Re: [PATCH v5 3/3] ARM: dts: tegra: Work safely with 256 MB Colibri-T20 modules

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Date:   Thu, 17 May 2018 13:42:24 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Lucas Stach <dev@...xeye.de>
Subject: Re: [PATCH v5 3/3] ARM: dts: tegra: Work safely with 256 MB
 Colibri-T20 modules

On 17.05.2018 09:45, Krzysztof Kozlowski wrote:
> Colibri-T20 can come in 256 MB RAM (with 512 MB NAND) or 512 MB RAM
> (with 1024 MB NAND) flavors.  Both of them will use the same DTSI
> expecting the bootloader to do the fixup of /memory node.  However in
> case it does not happen, let's stay on safe side by limiting the memory
> to 256 MB for both versions of Colibri-T20.
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> 
> ---
> 
> RFT:
> Not tested on 512 MB module as I have only the 256 MB one.
> 
> Changes since v4:
> 1. Drop the 512 suffix from file names (suggested by Stefan).
> 
> Changes since v3:
> 1. Reduce the memory in existing DTSI instead of creating a new one
>    (suggested by Marcel).
> 
> Changes since v2:
> 1. Do not add new compatible but use everywhere existing
>    "toradex,colibri_t20-512" (suggested by Rob).
> 
> Changes since v1:
> 1. Fix memory size in tegra20-colibri-256.dtsi (was working fine because
>    my bootloader uses mem= argument).
> ---
>  arch/arm/boot/dts/Makefile                                       | 2 +-
>  .../boot/dts/{tegra20-colibri-512.dtsi => tegra20-colibri.dtsi}  | 9 +++++++--
>  arch/arm/boot/dts/{tegra20-iris-512.dts => tegra20-iris.dts}     | 4 ++--

Almost.

Since we rename anyway, I would add the module name here too. The
hardware actually consists of the Tegra 2 SoC on a Colibri Module,
sitting in a Iris board.

So:

arch/arm/boot/dts/tegra20-colibri-iris.dts

This would align with the other modules we have upstream, e.g.:

arch/arm/boot/dts/imx6dl-colibri-eval-v3.dts

--
Stefan

>  3 files changed, 10 insertions(+), 5 deletions(-)
>  rename arch/arm/boot/dts/{tegra20-colibri-512.dtsi =>
> tegra20-colibri.dtsi} (98%)
>  rename arch/arm/boot/dts/{tegra20-iris-512.dts => tegra20-iris.dts} (95%)
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index ec2024ea8b1e..837f8274b3ee 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -1030,7 +1030,7 @@ dtb-$(CONFIG_ARCH_TANGO) += \
>  	tango4-vantage-1172.dtb
>  dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
>  	tegra20-harmony.dtb \
> -	tegra20-iris-512.dtb \
> +	tegra20-iris.dtb \
>  	tegra20-medcom-wide.dtb \
>  	tegra20-paz00.dtb \
>  	tegra20-plutux.dtb \
> diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi
> b/arch/arm/boot/dts/tegra20-colibri.dtsi
> similarity index 98%
> rename from arch/arm/boot/dts/tegra20-colibri-512.dtsi
> rename to arch/arm/boot/dts/tegra20-colibri.dtsi
> index 305efb275b48..b9387c540450 100644
> --- a/arch/arm/boot/dts/tegra20-colibri-512.dtsi
> +++ b/arch/arm/boot/dts/tegra20-colibri.dtsi
> @@ -2,7 +2,7 @@
>  #include "tegra20.dtsi"
>  
>  / {
> -	model = "Toradex Colibri T20 512MB";
> +	model = "Toradex Colibri T20 256/512 MB";
>  	compatible = "toradex,colibri_t20-512", "nvidia,tegra20";
>  
>  	aliases {
> @@ -12,7 +12,12 @@
>  
>  	memory@0 {
>  		device_type = "memory";
> -		reg = <0x00000000 0x20000000>;
> +		/*
> +		 * Set memory to 256 MB to be safe as this could be used on
> +		 * 256 or 512 MB module. It is expected from bootloader
> +		 * to fix this up for 512 MB version.
> +		 */
> +		reg = <0x00000000 0x10000000>;
>  	};
>  
>  	host1x@...00000 {
> diff --git a/arch/arm/boot/dts/tegra20-iris-512.dts
> b/arch/arm/boot/dts/tegra20-iris.dts
> similarity index 95%
> rename from arch/arm/boot/dts/tegra20-iris-512.dts
> rename to arch/arm/boot/dts/tegra20-iris.dts
> index 40126388946d..57f16c0e9917 100644
> --- a/arch/arm/boot/dts/tegra20-iris-512.dts
> +++ b/arch/arm/boot/dts/tegra20-iris.dts
> @@ -1,10 +1,10 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /dts-v1/;
>  
> -#include "tegra20-colibri-512.dtsi"
> +#include "tegra20-colibri.dtsi"
>  
>  / {
> -	model = "Toradex Colibri T20 512MB on Iris";
> +	model = "Toradex Colibri T20 256/512 MB on Iris";
>  	compatible = "toradex,iris", "toradex,colibri_t20-512", "nvidia,tegra20";
>  
>  	aliases {