Dragonboard410c Max SPI speed


#1

Looking at this pull request to Enable SPI guide the SPI max speed for the boot image was downed from 50MHz to 500KHz. Is there a reason for this? Is there a Max SPI speed anywhere in the docs, I can’t find it.


#2

Hi @sjfricke Spencer:

The SPI runs at any speed you like up to 50MHz. Just change the speed value in the device tree.

You can find the max speed specification in the Device Specification for the chip (Page 83)

Full disclosure: I am an employee of Qualcomm Canada, any opinions I have expressed in this or any other post may not reflect the opinions of my employer.


#3

Spidev utility reported the maximum speed of 500KHz for Dragonboard410c. That’s why I reduced the speed.

Regards,
Mani


#4

Hi @Mani

Looks like the spidev utility is not reporting the correct capabilities. I (and others on the forums) have run the SPI at 50MHz, it works.

Full disclosure: I am an employee of Qualcomm Canada, any opinions I have expressed in this or any other post may not reflect the opinions of my employer.


#5

Thanks for the input @ljking. Will look into it.