linux-kernel - Re: [PATCH v5 0/6] Add SiFive FU740 PCIe host controller driver support

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Date:   Thu, 8 Apr 2021 17:25:39 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Greentime Hu <greentime.hu@...ive.com>
Cc:     paul.walmsley@...ive.com, hes@...ive.com, erik.danie@...ive.com,
        zong.li@...ive.com, bhelgaas@...gle.com, robh+dt@...nel.org,
        aou@...s.berkeley.edu, mturquette@...libre.com, sboyd@...nel.org,
        p.zabel@...gutronix.de, alex.dewar90@...il.com,
        khilman@...libre.com, hayashi.kunihiko@...ionext.com,
        vidyas@...dia.com, jh80.chung@...sung.com,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, helgaas@...nel.org
Subject: Re: [PATCH v5 0/6] Add SiFive FU740 PCIe host controller driver
 support

On Tue, Apr 06, 2021 at 05:26:28PM +0800, Greentime Hu wrote:
> This patchset includes SiFive FU740 PCIe host controller driver. We also
> add pcie_aux clock and pcie_power_on_reset controller to prci driver for
> PCIe driver to use it.
> 
> This is tested with e1000e: Intel(R) PRO/1000 Network Card, AMD Radeon R5
> 230 graphics card and SP M.2 PCIe Gen 3 SSD in SiFive Unmatched based on
> v5.11 Linux kernel.
> 
> Changes in v5:
>  - Fix typo in comments
>  - Keep comments style consistent
>  - Refine some error handling codes
>  - Remove unneeded header file including
>  - Merge fu740_pcie_ltssm_enable implementation to fu740_pcie_start_link
> 
> Changes in v4:
>  - Fix Wunused-but-set-variable warning in prci driver
> 
> Changes in v3:
>  - Remove items that has been defined
>  - Refine format of sifive,fu740-pcie.yaml
>  - Replace perstn-gpios with the common one
>  - Change DBI mapping space to 2GB from 4GB
>  - Refine drivers/reset/Kconfig
> 
> Changes in v2:
>  - Refine codes based on reviewers' feedback
>  - Remove define and use the common one
>  - Replace __raw_writel with writel_relaxed
>  - Split fu740_phyregreadwrite to write function
>  - Use readl_poll_timeout in stead of while loop checking
>  - Use dwc common codes
>  - Use gpio descriptors and the gpiod_* api.
>  - Replace devm_ioremap_resource with devm_platform_ioremap_resource_byname
>  - Replace devm_reset_control_get with devm_reset_control_get_exclusive
>  - Add more comments for delay and sleep
>  - Remove "phy ? x : y" expressions
>  - Refine code logic to remove possible infinite loop
>  - Replace magic number with meaningful define
>  - Remove fu740_pcie_pm_ops
>  - Use builtin_platform_driver
> 
> Greentime Hu (5):
>   clk: sifive: Add pcie_aux clock in prci driver for PCIe driver
>   clk: sifive: Use reset-simple in prci driver for PCIe driver
>   MAINTAINERS: Add maintainers for SiFive FU740 PCIe driver
>   dt-bindings: PCI: Add SiFive FU740 PCIe host controller
>   riscv: dts: Add PCIe support for the SiFive FU740-C000 SoC
> 
> Paul Walmsley (1):
>   PCI: fu740: Add SiFive FU740 PCIe host controller driver

I can pull the patches above into the PCI tree (but will drop patch 6 -
dts changes), is it OK for you ? Please let me know how you would like
to upstream it.

Lorenzo

>  .../bindings/pci/sifive,fu740-pcie.yaml       | 113 +++++++
>  MAINTAINERS                                   |   8 +
>  arch/riscv/boot/dts/sifive/fu740-c000.dtsi    |  33 ++
>  drivers/clk/sifive/Kconfig                    |   2 +
>  drivers/clk/sifive/fu740-prci.c               |  11 +
>  drivers/clk/sifive/fu740-prci.h               |   2 +-
>  drivers/clk/sifive/sifive-prci.c              |  54 +++
>  drivers/clk/sifive/sifive-prci.h              |  13 +
>  drivers/pci/controller/dwc/Kconfig            |   9 +
>  drivers/pci/controller/dwc/Makefile           |   1 +
>  drivers/pci/controller/dwc/pcie-fu740.c       | 308 ++++++++++++++++++
>  drivers/reset/Kconfig                         |   1 +
>  include/dt-bindings/clock/sifive-fu740-prci.h |   1 +
>  13 files changed, 555 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/pci/sifive,fu740-pcie.yaml
>  create mode 100644 drivers/pci/controller/dwc/pcie-fu740.c
> 
> -- 
> 2.30.2
>