linux-kernel - Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug

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Date:   Wed, 9 Aug 2017 11:22:50 +0530
From:   Oza Oza <oza.oza@...adcom.com>
To:     Ray Jui <ray.jui@...adcom.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        "bcm-kernel-feedback-list@...adcom.com" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Andy Gospodarek <gospo@...adcom.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Oza Pawandeep <oza.pawandeep@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 2/2] PCI: iproc: Add optional brcm,pci-hotplug

On Wed, Aug 9, 2017 at 11:13 AM, Oza Oza <oza.oza@...adcom.com> wrote:
> On Wed, Aug 9, 2017 at 10:57 AM, Ray Jui <ray.jui@...adcom.com> wrote:
>>
>>
>> On 8/8/2017 10:22 PM, Oza Oza wrote:
>>>
>>> On Tue, Aug 8, 2017 at 7:50 PM, Rob Herring <robh+dt@...nel.org> wrote:
>>>>
>>>> Please send bindings to DT list.
>>>
>>> Sure, will do that.
>>>
>>>> On Mon, Aug 7, 2017 at 11:44 PM, Oza Pawandeep <oza.oza@...adcom.com>
>>>> wrote:
>>>>>
>>>>> Add description for optional device tree property
>>>>> 'brcm,pci-hotplug' for PCI hotplug feature.
>>>>>
>>>>> Signed-off-by: Oza Pawandeep <oza.oza@...adcom.com>
>>>>> Reviewed-by: Ray Jui <ray.jui@...adcom.com>
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>>> b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>>> index b8e48b4..a3bad24 100644
>>>>> --- a/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>>> +++ b/Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
>>>>> @@ -72,6 +72,29 @@ Optional properties:
>>>>>   - brcm,pcie-msi-inten: Needs to be present for some older iProc
>>>>> platforms that
>>>>>   require the interrupt enable registers to be set explicitly to enable
>>>>> MSI
>>>>>
>>>>> +Optional properties:
>>>>> +- brcm,pci-hotplug: PCI hotplug feature is supported.
>>>>
>>>> I think we should make this a common property. We already have
>>>> "ibm,slot-pluggable", so I'd propose "slot-pluggable".
>>>>
>>>> There's also "hotpluggable" for memory nodes defined, so we could
>>>> reuse that here.
>>>>
>>> ok I will rename this to
>>> brcm,slot-pluggable
>>
>>
>> How's brcm,slot-pluggable a common property? It's still brcm specific.
>> Didn't Rob propose either "slot-pluggable" or "hotpluggable"?
>>
>> And note it goes to the generic PCI binding instead iProc PCIe specific
>> binding.
>>
>
> Initially I thought, Rob suggested either "slot-pluggable".
> followed by, "hotpluggable" since memory node already has such property.
>
> but not sure in which generic pci binding I should add ?
> should it be part of
> Documentation/devicetree/bindings/pci/host-generic-pci.txt
>
> Can you please clarify Rob ?
>
> Regards,
> Oza.

To add, every SOC might have different way of implementing hotplug.
so I suppose both the binding documents have to be updated.

Documentation/devicetree/bindings/pci/host-generic-pci.txt
which can have common boolean property
named "hotpluggable"

and SOC specific implementation can stay here
for e.g.
Documentation/devicetree/bindings/pci/brcm,iproc-pcie.txt
brcm,prsnt-gpios

Rob and Ray:
please let me know how this sounds.

Regards,
Oza.