linux-kernel - Re: [PATCH v4 3/4] dt-bindings: PCI: rockchip: Add support for pcie wake irq

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Date:   Mon, 28 Aug 2017 15:44:49 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Jeffy Chen <jeffy.chen@...k-chips.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Doug Anderson <dianders@...omium.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 3/4] dt-bindings: PCI: rockchip: Add support for pcie
 wake irq

On Mon, Aug 28, 2017 at 04:32:55PM -0500, Rob Herring wrote:
> On Fri, Aug 25, 2017 at 1:20 PM, Brian Norris <briannorris@...omium.org> wrote:
> > On Fri, Aug 25, 2017 at 01:14:39PM -0500, Rob Herring wrote:
> >> Use the wakeup source binding:
> >> Documentation/devicetree/bindings/power/wakeup-source.txt
> >
> > And I suppose this means we'd fall under this paragraph?
> >
> >     "However if the devices have dedicated interrupt as the wakeup source
> >     then they need to specify/identify the same using device specific
> >     interrupt name. In such cases only that interrupt can be used as wakeup
> >     interrupt."
> >
> > We don't expect *any* interrupt to qualify as PCI WAKE#; so we should
> > still also document the interrupt name ("wake"?) in
> > Documentation/devicetree/bindings/pci/pci.txt as Bjorn suggested, in
> > addition to using the 'wakeup-source' property documented there.
> 
> I believe the defined interrupt name is "wakeup" as example 1 shows.

That's an example, not a definition. And the definition I quoted
literally says "device specific interrupt name". The PCIe specification
calls it "WAKE#" all over the place, so I figured that's a good name to
use.

"wakeup" is also fine I suppose, as long as we document that it must be
PCIe WAKE# signal, as per the PCIe specfication.

Brian