linux-kernel - Re: [PATCH] ARM: dts: imx6ul-kontron-ul2: Add Exceet/Kontron iMX6-UL2 SoM

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Message-ID: <CAJKOXPdq5e1OPmxamicAVf4ZDoSAuD=yvfOgZD04aQD9PtnCEQ@mail.gmail.com>
Date:   Tue, 16 Jul 2019 09:50:34 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Schrempf Frieder <frieder.schrempf@...tron.de>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: dts: imx6ul-kontron-ul2: Add Exceet/Kontron iMX6-UL2 SoM

On Fri, 12 Jul 2019 at 17:21, Schrempf Frieder
<frieder.schrempf@...tron.de> wrote:
>
> Hi Krzysztof,
>
> On 12.07.19 16:12, Krzysztof Kozlowski wrote:
> > Add support for iMX6-UL2 modules from Kontron Electronics GmbH (before
> > acquisition: Exceet Electronics) and evalkit boards based on it:
> >
> > 1. i.MX6 UL System-on-Module, a 25x25 mm solderable module (LGA pads and
> >     pin castellations) with 256 MB RAM, 1 MB NOR-Flash, 256 MB NAND and
> >     other interfaces,
> > 1. UL2 evalkit, w/wo eMMC, without display,
> > 2. UL2 evalkit with 4.3" display,
> > 3. UL2 evalkit with 5.0" display.
> >
> > This includes device nodes for unsupported displays (Admatec
> > T043C004800272T2A and T070P133T0S301).
> >
> > The work is based on Exceet source code (GPLv2) with numerous changes:
> > 1. Reorganize files,
> > 2. Rename Exceet -> Kontron,
> > 3. Fix coding style errors,
> > 4. Fix DTC warnings,
> > 5. Extend compatibles so eval boards inherit the SoM compatible,
> > 6. Use defines instead of GPIO flag values,
> > 7. Adjust operating points of CPU0,
> > 8. Sort nodes alphabetically.
> >
> > In downstream BSP the Exceet name still appears in multiple places
> > therefore I left it in the model names.
>
> First, thanks for your work. I planned to upstream these boards myself
> after the FSL QSPI spi-mem driver was merged in 5.1, but didn't have
> time to finalize and send the patches.
>
> Meanwhile we came up with a new naming scheme for our boards, that
> hasn't been implemented yet. But I would like to take this chance to
> implement the new scheme.

Sure, I see no problem in using different names, matching downstream
kernel. Just point me to proper names.

> Also there are some more flavors of the SoM (with i.MX6ULL instead of
> i.MX6UL, with 512MiB instead of 256MiB flash/RAM), that I would like to
> add and for which common parts of the SoM dtsi would need to be factored
> out to a separate file.

I have only this one particular flavor so I would prefer to upstream
only this one. I do not know all the possible combinations or for
example the most interesting ones. I think after this patchset we can
refactor the DTS whenever its needed - split common parts, add new
files.

> I would prefer to at least apply the naming changes before merging. The
> additional board flavors could be added before merging or I could send
> them as follow-up patches. What do you think?

Let's change the naming and add new flavors as follow ups?

Best regards,
Krzysztof