Re: [PATCH v6] mwifiex: parse device tree node for PCIe

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On Wed, Oct 26, 2016 at 2:08 PM, Brian Norris <briannorris@xxxxxxxxxxxx> wrote:
> On Wed, Oct 26, 2016 at 02:06:48PM -0700, Dmitry Torokhov wrote:
>> On Wed, Oct 26, 2016 at 01:56:34PM -0700, Brian Norris wrote:
>> > On Wed, Oct 26, 2016 at 01:51:48PM -0700, Rajat Jain wrote:
>> > >    On Wed, Oct 26, 2016 at 1:46 PM, Dmitry Torokhov
>> > >    <dmitry.torokhov@xxxxxxxxx> wrote:
>> > >      On Wed, Oct 26, 2016 at 01:17:36PM -0700, Brian Norris wrote:
>> > >      Sorry, I just saw this... Why do we need devicetree data for
>> > >      discoverable bus (PCI)? How does the driver work on systems that do not
>> > >      use DT? Why do we need them to behave differently?
>> > >
>> > >    There are a couple of out-of-band GPIO pins from Marvell chip that can
>> > >    serve as wake-up pins (wake up the CPU when asserted). The Marvell chip
>> > >    has to be told which GPIO pin is to be used as the wake-up pin. The pin to
>> > >    be used is system / platform dependent. (On some systems it could be
>> > >    GPIO13, on others it could be GPIO14 etc depending on how the marvell chip
>> > >    is wired up to the CPU).
>>
>> So wakeup pin is not wired to PCIe WAKE?
>
> Not in our case.
>
>> > There's also calibration data. See "marvell,caldata*" and
>> > "marvell,wakeup-pin" properties. Currently only for SDIO, in
>> > Documentation/devicetree/bindings/net/wireless/marvell-sd8xxx.txt, but
>> > we're adding support for PCIe.
>>
>> How would it all work if I moved the PCIe module from one device to
>> another?
>
> These boards are soldered down, at least in the case I care about.

That is right. Since the out of band wake-up pin is not standard on
the PCIe connector - this feature is for soldered chips only.


>
> Brian
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