linux-kernel - Re: [PATCH 6/7] ARM: dts: Add dts for Raspberry Pi 4 + Cirrus Logic Lochnagar2

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Message-ID: <5d2587193f0e99996445d5fa507a8acf7854fed3.camel@suse.de>
Date:   Thu, 15 Oct 2020 17:12:42 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>, broonie@...nel.org,
        robh+dt@...nel.org
Cc:     patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org
Subject: Re: [PATCH 6/7] ARM: dts: Add dts for Raspberry Pi 4 + Cirrus Logic
 Lochnagar2

On Thu, 2020-10-15 at 12:14 +0100, Richard Fitzgerald wrote:
> > Sadly I don't think creating a new device tree is a good solution here. If we
> > were to do so for every RPi hat/usage it'd become unmanageable very fast. There
> > is a way to maintain this in the open nonetheless. I suggest you build a DT
> > overlay and submit it to https://github.com/raspberrypi/linux, see
> > 'arch/arm/boot/dts/overlays.' The Raspberry Pi engineers have a kernel branch
> 
> We want something in mainline so that it can be used by people
> developing on mainline and taken as a starting point for configuring
> the codecs for other host platforms. The RPi is a convenient platform to
> use as the base because it is widely available and low-cost.

If what you want to convey is the proper way of configuring your specific
device the way to go is writing a devicetree binding. See
Documentation/devicetree. It's even possible to validate a given devicetree
against the bindings (given they are written in yaml format).

Regards,
Nicolas


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