linux-kernel - Re: [PATCH v4 2/4] ARM: dts: NSP: Add DT files for Meraki MX64 series

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Date:   Fri, 25 Jun 2021 11:59:08 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Matthew Hagan <mnhagan88@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Olof Johansson <olof@...om.net>, SoC Team <soc@...nel.org>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 2/4] ARM: dts: NSP: Add DT files for Meraki MX64 series

On Fri, Jun 25, 2021 at 11:52 AM Matthew Hagan <mnhagan88@...il.com> wrote:
>
> MX64 & MX64W Hardware info:
>   - CPU: Broadcom BCM58625 Cortex A9 @ 1200Mhz
>   - RAM: 2 GB (4 x 4Gb SK Hynix H5TC4G83CFR)
>   - Storage: 1 GB (Micron MT29F8G08ABACA)
>   - Networking: BCM58625 internal switch (5x 1GbE ports)
>   - USB: 1x USB2.0
>   - Serial: Internal header
>   - WLAN(MX64W only): 2x Broadcom BCM43520KMLG on the PCI bus
>
> This patch adds the Meraki MX64 series-specific bindings. Since some
> devices make use of the older A0 SoC, changes need to be made to
> accommodate this case, including removal of coherency options and
> modification to the secondary-boot-reg.
>
> Signed-off-by: Matthew Hagan <mnhagan88@...il.com>

Removing the dma-coherent flags in the dts file seemed really odd until
I read the text above. It would seem more logical to me to have a .dtsi file
that has all the a0 revision specific changes, and include that from the
dts file.

On the other hand, the /chosen, /aliases and  /memory nodes that you have
in the .dtsi file should probably get moved into the .dts files, as these tend
to be board specific settings, even if the examples you have are all
the same.

       Arnd