l4t 28.2 camera sensor device tree i2c host1x entry

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hi nvidia,

I noticed in device tree of the example camera sensor that the host1x entry contains an i2c entry containing a camera sensor entry. Is that physically correct ? Is there a i2c bus in the host1x bus and must the camera sensors be connected that way ? I have seen that the linux kernel in l4t 28.2 does now support spi sensors. What must then be written in the device tree under the host1x entry for spi sensors ?

2

hello phdm,

may I know which Jetson platform/ JetPack release you would like to work with SPI sensors.
here are some information for your reference, TX1 SPI, TX2 SPI
thanks

3

Hello JerryChang,

we are currently developing with TX1, but could switch to TX2 if we need more GPU power.

we are using l4t 28.2.1

thank you for the links; we succeeded to use SPI to communicate with our camera sensor.

my question is : we have described our sensor in the dt in a top-level spi@7000d400 entry. Must we also declare our sensor a second time inside a spi@7000d400 entry inside the host1x entry ?

4

hello phdm,

there’s SPI driver for sensor controls, you should separate spi and host1x declarations.
thanks

5

Is it necessary to put a spi@… { imx…@ { } } block inside the host1x block ? What could not work if we don’t add such block and describe completely the sensor at its natural position in the spi@… block ?