Re: [PATCH 2/3] dt-bindings: spi: Add DT schema for Tegra SPIDEV controller

[Mark Brown]

On Wed, Nov 27, 2024 at 03:54:52PM +0000, Jon Hunter wrote:

> On the Tegra Jetson boards we have a 40-pin expansion header similar to what
> is found on boards like Raspberry Pi and allows users to connect various
> cards to. By having a pseudo device we can interact with different SPI
> devices.

> Yes by default nothing is connected and so there is nothing to talk to.
> However, this does enable us to do SPI loopback testing for example.

> So I am wondering if it would be acceptable to having some generic dummy
> device-tree compatible string for this? I guess it does not need to be Tegra
> specific.

I understand what he's trying to accomplish, it's the same thing as
what everyone who wants to put a raw spidev compatible in their DT is
trying to do.  The way to do this would be something like a DT overlay
that describes whatever is actually connected, or just customise the DT
locally.

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