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

[Minda Chen <minda.chen@starfivetech.com>]

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.
> 
>