ath10k: calibration data through Device Tree?

Kalle Valo kvalo at
Thu Oct 2 07:55:57 PDT 2014

Arnd Bergmann <arnd at> writes:

> On Thursday 02 October 2014 16:47:48 Kalle Valo wrote:
>> >
>> > 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. 
>> For me that's easier said than done as I'm a total newbie with Device
>> Tree  Can you give any pointers or examples how to do that in
>> practise, please? Especially "node in the dts file that corresponds to
>> the PCI dev" part is puzzling me.
> See the recent patch "[PATCH v4] ARM: shmobile: r8a7791: link PCI USB
> devices to USB PHY" where someone does the same thing to supply additional
> data to a PCI device node in shmobile.
> Basically you just need to add a node under your PCI host controller node
> with "reg = <0x800 0 0 0 0>" (or whatever the address is and put the
> properties in there. See
> for the description of how to construct the addresses.

Excellent, thanks. I'll study these and try to learn more.

> I notice that there are no Qualcomm or Atheros PCI host controller drivers
> in Linux though, so you first have to write a driver that allows probing
> the PCI bus, and get the binding reviewed for that before you can add
> it to the dts files. Is this for ipq8064 or something else?

But now I'm lost again :) I want ath10k and this feature to work with
all possible PCI controllers, not just with Qualcomm controllers. So why
do I need to wait for Qualcomm PCI host controller driver?

Kalle Valo

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