linux-kernel - Re: [PATCH v1 0/3] Add JH7110 PCIe driver support

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Message-ID: <d9dde509-8923-a930-4c82-4bc8bd78ed0d@starfivetech.com>
Date:   Fri, 7 Apr 2023 10:32:51 +0800
From:   Minda Chen <minda.chen@...rfivetech.com>
To:     Conor Dooley <conor.dooley@...rochip.com>
CC:     Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Conor Dooley <conor@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mason Huo <mason.huo@...rfivetech.com>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
        Kevin Xie <kevin.xie@...rfivetech.com>,
        <daire.mcnamara@...rochip.com>
Subject: Re: [PATCH v1 0/3] Add JH7110 PCIe driver support



On 2023/4/6 19:54, Conor Dooley wrote:
> Gah, I never actually CCed Daire. Apologies for the additional email.
> 
> On Thu, Apr 06, 2023 at 12:47:41PM +0100, Conor Dooley wrote:
>> +CC Daire
>> 
>> Hey Minda,
>> 
>> On Thu, Apr 06, 2023 at 07:11:39PM +0800, Minda Chen wrote:
>> > This patchset adds PCIe driver for the StarFive JH7110 SoC.
>> > The patch has been tested on the VisionFive 2 board. The test
>> > devices include M.2 NVMe SSD and Realtek 8169 Ethernet adapter.
>> 
>> I was talking with Daire last week about some changes he's working on
>> for the microchip driver, and we seemed to recall an off-list email
>> sent to Daire & Bjorn about extracting the common PLDA bits from the
>> pcie-microchip-host driver to be used with an (at that point)
>> unreleased SoC. Perhaps Bjorn has this in his mailbox somewhere still,
>> our corporate mail policy scrubs things from over a year ago & I could
>> not find it.
>>
>> I realised that that may actually have been StarFive, and the driver on
>> your GitHub [1] certainly felt very familiar to Daire (he said it was
>> very similar to his earlier revisions of his driver).
>> 
>> I've not looked at a diff between this and the version you ship on
>> GitHub, but first a quick inspection it mostly just looks like you
>> did s/plda/sifive/ on the file.
>> 
>> I'm obviously not a PCI maintainer, but if there are common bits between
>> the two drivers, extracting common bits seems like a good idea to me...
>Thanks. It is pleasure to using same common codes. Does common bits changes
will upstream soon?
And I see there are many difference between pcie-microchip-host and our codes.
>> https://github.com/starfive-tech/linux/blob/JH7110_VisionFive2_devel/drivers/pci/controller/pcie-plda.c
>> > 
>> > This patchset should be applied after the patchset [1], [2], [3] and[4]:
>> > [1] https://patchwork.kernel.org/project/linux-riscv/cover/20230314124404.117592-1-xingyu.wu@starfivetech.com/
>> > [2] https://lore.kernel.org/all/20230315055813.94740-1-william.qiu@starfivetech.com/
>> > [3] https://patchwork.kernel.org/project/linux-phy/cover/20230315100421.133428-1-changhuang.liang@starfivetech.com/
>> > [4] https://patchwork.kernel.org/project/linux-usb/cover/20230406015216.27034-1-minda.chen@starfivetech.com/
>> 
>> How many of the dependencies here are compiletime for the driver & how
>> many of them are just for the dts patch?
>> 
PCIe rely on stg clock in [1], rely on stg syscon in [2].
Patch [2] is accepted now. Maybe I will delete this.
both [3] and [4] is PHY dependency. 
>> Cheers,
>> Conor.
> 
>