linux-kernel - Re: [RFC PATCH v8 1/7] dt-bindings: PCI: Add definition of PCIe WAKE# irq and PCI irq

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Date:   Fri, 27 Oct 2017 11:06:34 +0800
From:   jeffy <jeffy.chen@...k-chips.com>
To:     Brian Norris <briannorris@...omium.org>
CC:     linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
        linux-pm@...r.kernel.org, tony@...mide.com,
        shawn.lin@...k-chips.com, rjw@...ysocki.net, dianders@...omium.org,
        devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [RFC PATCH v8 1/7] dt-bindings: PCI: Add definition of PCIe WAKE#
 irq and PCI irq

Hi Brian,

On 10/27/2017 10:33 AM, Brian Norris wrote:
> On Thu, Oct 26, 2017 at 09:28:34PM +0800, Jeffy Chen wrote:
>> Add optional interrupts for PCIe WAKE# pin and PCI interrupt pin.
>>
>> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
>> ---
>>
>> Changes in v8:
>> Add optional "pci", and rewrite commit message.
>>
>> Changes in v7: None
>> Changes in v6: None
>> Changes in v5:
>> Move to pci.txt
>>
>> Changes in v3: None
>> Changes in v2: None
>>
>>   Documentation/devicetree/bindings/pci/pci.txt | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt
>> index c77981c5dd18..faed405811cd 100644
>> --- a/Documentation/devicetree/bindings/pci/pci.txt
>> +++ b/Documentation/devicetree/bindings/pci/pci.txt
>> @@ -24,3 +24,6 @@ driver implementation may support the following properties:
>>      unsupported link speed, for instance, trying to do training for
>>      unsupported link speed, etc.  Must be '4' for gen4, '3' for gen3, '2'
>>      for gen2, and '1' for gen1. Any other values are invalid.
>> +- interrupts: Interrupt specifier for each name in interrupt-names.
>> +- interrupt-names: May contains "wakeup" for PCIe WAKE# interrupt and "pci"
>> +  for PCI interrupt.
>
> Similar criticism to what Rob made on patch 4: this file already says "a
> host bridge driver implementation may support the following properties",
> so this property is clearly not for child devices. And so having the
> "PCI interrupt" here doesn't make much sense.
>
> Similarly, you're documenting "wakeup" here as a host bridge property,
> but then patch 7 is adding per-device support it seems? That seems
> wrong.
oops...so there's no section for PCI device here, maybe i should add a 
section about "PCI device have standardized Device Tree bindings:" to 
place it? will do in next version.


>
> In fact, I'm pretty sure this series fails to actually look in the host
> bridge for the "wakeup" interrupt at all! Did you actually test this?
actually it could...

static void *of_pci_setup(struct device *dev)
{
...
         device_init_wakeup(dev, false);

         dev_info(dev, "Wakeup IRQ %d\n", irq);
         return data;
}

[    1.546561] OF: PCI:   MEM 0xfa000000..0xfbdfffff -> 0xfa000000
[    1.553154] OF: PCI:    IO 0xfbe00000..0xfbefffff -> 0xfbe00000
[    1.560859] rockchip-pcie f8000000.pcie: Wakeup IRQ 64
[    1.566555] rockchip-pcie f8000000.pcie: PCI host bridge to bus

>
> And again, describing your intentions a little better in the commit
> message would make this clearer. Then we could tell which way you
> intended this to work...
ok, will do in next version...
>
> Brian
>
>
>