Re: ath10k: calibration data through Device Tree?

[Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>]

On Thursday 02 October 2014 16:14:43 Kalle Valo wrote:
> Hi Device Tree gurus,
> 
> 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. Basically our
> requirements are:
> 
> * ath10k must support any number of radios (one radio per PCI device).
> 
> * 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.
> 
> * ath10k must be able to reliably map the PCI device (=radio) to the
>   correct calibration data. Maybe with using PCI bus and slot numbers?
> 
> We have been trying to find similar cases from other drivers but no
> luck. Basically my question is how to do this properly with Device Tree?
> Especially how to map the calibration data to correct PCI device? Are
> there any examples which would help us to implement this?

When you know the PCI bus/device/function ID of the device, you can put
a device node in the dts file that corresponds to the PCI dev, and you
can find the of_node pointer from pci_dev->dev.of_node. 2116 is probably
ok to put into a DT property of that device directly.

	Arnd
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