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How to use spi device(TMP125AIDBVR)

Hi.

I have developed  a substrate using DM8168 that based on a EZSDK5.04.00.11.

On it, I want to use a temperature sensor SPI interface.

I believe need to write the "open("/dev/spi***", 0, O_RDWR)" to use the device for SPI.

But I could not find /dev/spi***.

How does SPI device you're using?