Re: ath10k: calibration data through Device Tree?

Hi,

ath10k is a wireless driver for Qualcomm Atheros 802.11ac hardware and
located in drivers/net/wireless/ath/ath10k/. Currently it only supports
PCI devices.

Some of the devices store the calibration data to the host flash and the
bootloader reads the data from the flash. And now we need a method to
deliver the calibration data from bootloader to ath10k. 

What does this calibration data consist of?

What happens if you don't have the calibration data? Is it a critical
requirement for the use of the device, or does its absence simply result
in degraded performance?

What do you do on non-DT systems? Where does the information come from
in that case?

I'm somewhat puzzled as to why a discoverable PCI device would require
non-discoverable information to use.

* The calibration data is now 2116 bytes, in the future it might be
  longer. The data is unique for each radio and is created at the
  factory.

Why would this change in future? Who is in charge of providing this
information, and deciding upon the format thereof?

* ath10k must be able to reliably map the PCI device (=radio) to the
  correct calibration data. Maybe with using PCI bus and slot numbers?

I guess we'd have to do something along those lines.

I'd like to get a better understanding of the problem before we start
figuring out how to pass an arbitrary blob of information around.

Thanks,
Mark.
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