linux-kernel - Re: [PATCH] spi: spidev: Add compatible for external SPI ports on Kontron boards

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Message-ID: <20200702150725.GI4483@sirena.org.uk>
Date:   Thu, 2 Jul 2020 16:07:25 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Frieder Schrempf <frieder.schrempf@...tron.de>
Cc:     linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH] spi: spidev: Add compatible for external SPI ports on
 Kontron boards

On Thu, Jul 02, 2020 at 04:46:09PM +0200, Frieder Schrempf wrote:

> My intention is to use the spidev driver in the default board DT for an
> interface that is routed to an extension connector and has no dedicated
> slave device attached onboard. So users can attach sensors, etc. with
> userspace drivers without touching the kernel or DT.

The expected way of doing this is to describe whatever was attached via
DT when it's attached - the device is what has the compatible, not some
connector in the middle of the connection.  The way you've got things
set up if the device has a driver then they won't be able to instantiate
the driver.

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