linux-kernel - Re: [PATCH 2/2] arm64: dts: ti: Add basic support for phyBOARD-Lyra-AM625

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Date:   Mon, 8 May 2023 11:41:13 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Wadim Egorov <w.egorov@...tec.de>
Cc:     Nishanth Menon <nm@...com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org, upstream@...ts.phytec.de,
        vigneshr@...com, kristo@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, keescook@...omium.org,
        tony.luck@...el.com, gpiccoli@...lia.com
Subject: Re: [PATCH 2/2] arm64: dts: ti: Add basic support for
 phyBOARD-Lyra-AM625

* Wadim Egorov <w.egorov@...tec.de> [230505 13:38]:
> 
> Am 05.05.23 um 11:39 schrieb Tony Lindgren:
> > * Nishanth Menon <nm@...com> [230504 14:33]:
> > > Just wondering: if the carrier board can easily work with different
> > > SoMs.. in which case, we could do overlay to create the som + carrier
> > > overlay to create rdk dtb - this might allow the scheme to scale to
> > > additional SoMs and carrier combinations.. and the SoM dtb could be
> > > sufficient for something like a bootloader.
> > It might be best to limit the overlay usage to devices that might see
> > dual use on the carrier board.. Not sure if setting up the entire
> > carrier board makes sense as an overlay :) Not sure if folks want to
> > debug boot issues on a remote server for example if an overlay is
> > needed to boot with Ethernet :)
> 
> Our idea is to create overlays for SoM variants, e.g. an overlay for a SoM
> without SPI NOR flash populated.
> If we want to reuse a carrier board, we could factor out the carrier board
> dts into a dtsi file and provide the needed combinations in form of
> different dts files.

It probably makes sens to limit the overlays for optional features that
are not hardwired.

> In the bootloader world the situation is a bit different.
> Here we would like to have a universal phycore_am62x "board" that should be
> able to handle most carrier board designs using that SoM. And since u-boot
> is moving towards having a single source of device trees, this concept will
> probably no longer work anymore. So your idea with a SoM dtb sounds
> interesting.
> I wonder what ideas other SoM vendors have or how it is handled on other
> architectures.

I'm not sure what the best way to organize things is if there are many
SoM and carrier board variants, I guess it depends on the number of the
possible permutations :)

Regards,

Tony