linux-kernel - Re: [PATCH 7/7] PCI: dwc: qcom: Add support for IPQ8074 PCIe controller

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Message-ID: <6b9988c7-1581-05fc-ef87-4d5486381cea@codeaurora.org>
Date:   Wed, 19 Jul 2017 15:36:35 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Varadarajan Narayanan <varada@...eaurora.org>,
        Stanimir Varbanov <svarbanov@...sol.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>, bhelgaas@...gle.com,
        robh+dt@...nel.org, mark.rutland@....com, kishon@...com,
        sboyd@...eaurora.org, fengguang.wu@...el.com,
        weiyongjun1@...wei.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, smuthayy <smuthayy@...eaurora.org>
Subject: Re: [PATCH 7/7] PCI: dwc: qcom: Add support for IPQ8074 PCIe
 controller

Hi,


On 07/19/2017 02:59 PM, Varadarajan Narayanan wrote:
> Stan,
>
> On Wed, Jul 19, 2017 at 10:12:45AM +0300, Stanimir Varbanov wrote:
>> Hi,
>>
>> On 07/19/2017 09:49 AM, Varadarajan Narayanan wrote:
>>> On Tue, Jul 18, 2017 at 09:44:38AM -0700, Bjorn Andersson wrote:
>>>> On Tue 18 Jul 02:58 PDT 2017, Varadarajan Narayanan wrote:
>>>>
>>>>> On Mon, Jul 17, 2017 at 03:07:18PM -0700, Bjorn Andersson wrote:
>>>>>> On Mon 17 Jul 05:04 PDT 2017, Varadarajan Narayanan wrote:
>>>> [..]
>>>>>> Can you confirm that this is actually version 4 of this block? Or are we
>>>>>> just incrementing an arbitrary number here?
>>>>> This is not exactly the 4th version of the block. However, it is
>>>>> a different version than the ones that are already supported in
>>>>> this driver. Since the existing driver didn't exactly tie it with
>>>>> the block IP version, I too followed the same versioning
>>>>> convention.
>>>>>
>>>> Do you have a block IP version that you could base your numbering on, to
>>>> break the trend? (We should go back and fix up the others as well)
>>> Presently, the driver supports the ipq8064, apq8064, apq8084,
>>> msm8996, ipq4019 and ipq8074. The SoCs, qcom_pcie_ops version and
>>> the block IP versions are as follows.
>>>
>>> 	ipq8064 - v0 - 2.1.0
>>> 	apq8064 - v0 - 2.1.0
>>> 	apq8084 - v1 - 1.0.0
>>> 	msm8996 - v2 - 2.3.2
>>> 	ipq4019 - v3 - 2.4.0
>>> 	ipq8074 - v4 - 2.3.3
>> That's nice, but I think we need the Synopsys IP versions too, can you
>> provide such an information and after that we can decide how the names
>> should look like.
> Sorry, I posted v2 before I saw this e-mail. Will post v3 based
> on what naming style is decided.
>
> The SoCs, qcom_pcie_ops version, the block IP version and
> Synopsys IP versions are as follows.
>
> 	ipq8064 - v0 - 2.1.0 - 4.01a
> 	apq8064 - v0 - 2.1.0 - 4.01a
> 	apq8084 - v1 - 1.0.0 - 4.11a
> 	msm8996 - v2 - 2.3.2 - 4.21a
> 	ipq4019 - v3 - 2.4.0 - 4.20a
> 	ipq8074 - v4 - 2.3.3 - 4.30a

I would have loved to say the dwc IP versions sounds better, but
this is the qcom wrapper over dwc. So, for me it makes more sense
to have qcom specific IP version names.
Can we have couple or more versions of qcom pcie IPs based on
same dwc IP version? I have not looked closely, but in that case
too using qcom nomenclature would again make more sense.


Thanks
Vivek

>
> Thanks
> Varada
>
>>> I will rename the qcom_pcie_ops structure and related functions
>>> with the block IP version instead of vX numbering and post the
>>> patch.
>>
>>
>> regards,
>> Stan
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