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

From: Jon Hunter
Date: Wed Mar 26 2025 - 08:17:16 EST



On 25/03/2025 17:05, Mark Brown wrote:

...

The way I imagine it, exporting would involve writing a chip-select to a
specific SPI controller's "export" sysfs attribute to have a SPI device
created for that particular chip-select and bind it to spidev.

My general feeling with those is that if you're building for them you're
probably either already modifiying your kernel or easily able to cope
with doing so.


That's definitely what we do today, modify the kernel directly to achieve what we need. I am trying to avoid carrying too many out of tree patches for stuff like this and have something in the kernel that works by default. This is even more important for 3rd party Linux distros that will not accept non-upstream code.

Our devkits, very much like Raspberry PI, allow users to connect various hardware for development and so having an easy way to connect a SPI device is useful. For any production systems, users will definitely want a proper device and device-tree bindings. So I am just trying to explore what would be acceptable. If it is acceptable to have a sysfs interface for creating a SPI device at runtime, then we can look into that.

Cheers!
Jon

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nvpublic