linux-kernel - Re: [PATCH v4 3/3] ARM: dts: tegra: Work safely with 256 MB Colibri-T20 modules

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Message-ID: <CAJKOXPcBpOUkVay7u=gHRuw3=gZkR2Jk0k3QycHZorxWz7x2jg@mail.gmail.com>
Date:   Thu, 17 May 2018 09:40:14 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Stefan Agner <stefan@...er.ch>
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 v4 3/3] ARM: dts: tegra: Work safely with 256 MB
 Colibri-T20 modules

On Tue, May 15, 2018 at 11:20 PM, Stefan Agner <stefan@...er.ch> wrote:
> On 15.05.2018 16:41, 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 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/tegra20-colibri-512.dtsi | 9 +++++++--
>>  arch/arm/boot/dts/tegra20-iris-512.dts     | 2 +-
>
> I don't like this variant too much.
>
> Can we not just drop the 512? And while at it, I would prefer to see the
> usual $soc-$module-$carrier schema, as we use with all the other modules
> of the Colibri and Apalis family.
>
> e.g.
> tegra20-colibri-512.dtsi -> tegra20-colibri.dtsi
> tegra20-iris-512.dts -> tegra20-colibri-iris.dts

Sure, let me resend it.

BR,
Krzysztof