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Whatever is attached to the SPI controller > needs to be described, not just a placeholder like this. Chatting with Vishwaroop, what he is trying to accomplish with this patchset it to have a pseudo SPI device that we can control from userspace. 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. Thanks Jon -- nvpublic