linux-kernel - Re: [Q] devicetree overlays

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Message-ID: <24f1687c-043a-a15e-0be4-8392e7b5c96b@metux.net>
Date:   Fri, 7 Aug 2020 13:25:58 +0200
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     Sven Van Asbroeck <thesven73@...il.com>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Frank Rowand <frowand.list@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Q] devicetree overlays

On 16.04.20 16:46, Sven Van Asbroeck wrote:

Hello folks,

> My situation is this: I have hardware which consists of several modules.
> Knowledge about the type and location of these modules is located in an
> on-board eeprom.

I've got a somewhat similar use cases, but not necessarily on DT-native
platforms:

a) composite devices that are probed via PCI or DMI and just instantiate
   a bunch of other (more generic) devices.

   For example the  APUv2/3/4 board driver: it eg. instanciates the
   gpio-amd-fch driver first, and then binds specific gpio lines to
   appropriate functions, eg. reset key (input), LEDs, ...

b) I2C devices behind an USB-based bus adapter.

In both cases it would be nice to have the actual device configuration
written as a DT snippet, which just needs to be loaded.

Let me know, if anybody has an idea how to do that.

--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287