Camera doesn't work with SPI2 set to slave, Cannot make SPI1 work as slave

Autonomous Machines Jetson & Embedded Systems Jetson Nano
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#1

I have a nano that generates test data and transmits it on SPI1. I have another nano that receives it on SPI2. This much is working. The test data is a mock up of data that will be coming from an embedded processor in the real system.

When I have SPI2 configured as a SPI slave, I can not get the camera to work. If I change it to a SPI master, the camera works fine.

Okay, so, no problem, I originally made SPI2 the slave because I thought I’d want a loopback test. Something I never actually worked on.

So, I tried setting up SPI1 as the slave. The Camera works in this configuration, but, I cannot receive data on SPI1.

Is there some reason I should expect the camera to interfere with SPI2? Is there some reason why SPI2 should work as a slave and not SPI1?

#3

There’s no any restrict which SPI much be master or slave.

#4

Is there any reason the SPI2 should interfere with the Camera?

It’s literally the only thing I’m changing in the DTS->DTB files.
Changing spi-tegra210 to spi-tegra124-slave in the compatibility line breaks the camera.

#5

I think the camera can’t be slave mode.
For the v4l2 camera driver the camera sensor driver should be implement as slave mode.

#7