linux-kernel - Re: [PATCH 1/2] arm64: boot: dts: add new dts for hellcat & petra

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Date:   Mon, 25 Jan 2021 21:04:19 +0000
From:   "Daniel Walker (danielwa)" <danielwa@...co.com>
To:     Michal Simek <michal.simek@...inx.com>
CC:     Mark Brown <broonie@...nel.org>,
        Daniel Walker <dwalker@...o99.com>,
        "xe-linux-external(mailer list)" <xe-linux-external@...co.com>,
        Rob Herring <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] arm64: boot: dts: add new dts for hellcat & petra

On Mon, Jan 25, 2021 at 08:52:01AM +0100, Michal Simek wrote:
> > 
> >>
> >> Long time ago we said that we are not going to push any PL related
> >> configurations. It means all below can't be merged.
> >> And there are also coding style issues.
> > 
> > You'll need to explain this more. It's likely this was added at the suggestion of
> > Xilinx. If it can't be upstreamed what should we replace it with ?
> 
> No idea who gave you this suggestion from Xilinx.
 
Just an FYI , I didn't write this dts or work on it's original development so I
can't name names.

> I had similar thread with Michael Walle about supporting Ebang board.
> PL depends on your custom design and can change quite quickly that's
> there is no good/bad configuration. That's why all of them can be valid
> and kernel is not the right location to store thousands of
> configurations (likely in overlay form). That's why only fixed
> configurations for PS are added to kernel.
> And I prefer if there is any good reason behind why these platforms
> should be added.

I'm not sure what your talking about above .. Are you suggesting the changes in
my DTS will change quickly ? They have been the same for years , we don't plan
to change them. This DTS is not a prototype it's a released Cisco product.

If I did delete this "PL configuration" where would you expect it to re-appear ?
Typically things which aren't upstreamable are transformed into something else,
it's rare that something is just removed and has no transformation.

Daniel