linux-kernel - Re: [RESEND PATCH v5 2/2] PCI: sprd: Add support for Unisoc SoCs' PCIe controller

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Date:   Thu, 14 Jan 2021 15:06:24 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Hongtao Wu <wuht06@...il.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hongtao Wu <billows.wu@...soc.com>
Subject: Re: [RESEND PATCH v5 2/2] PCI: sprd: Add support for Unisoc SoCs'
 PCIe controller

On Thu, Jan 14, 2021 at 08:00:50PM +0800, Hongtao Wu wrote:
> On Thu, Jan 14, 2021 at 4:52 PM Leon Romanovsky <leon@...nel.org> wrote:
> >
> > On Thu, Jan 14, 2021 at 04:29:28PM +0800, Hongtao Wu wrote:
> > > From: Hongtao Wu <billows.wu@...soc.com>
> > >
> > > This series adds PCIe controller driver for Unisoc SoCs.
> > > This controller is based on DesignWare PCIe IP.
> > >
> > > Signed-off-by: Hongtao Wu <billows.wu@...soc.com>
> > > ---
> > >  drivers/pci/controller/dwc/Kconfig     |  12 ++
> > >  drivers/pci/controller/dwc/Makefile    |   1 +
> > >  drivers/pci/controller/dwc/pcie-sprd.c | 293 +++++++++++++++++++++++++++++++++
> > >  3 files changed, 306 insertions(+)
> > >  create mode 100644 drivers/pci/controller/dwc/pcie-sprd.c
> >
> > <...>
> >
> > > +static struct platform_driver sprd_pcie_driver = {
> > > +     .probe = sprd_pcie_probe,
> > > +     .remove = __exit_p(sprd_pcie_remove),
> >                    ^^^^^^ why is that?
> >
>
> Thanks for the review.
>
> I think that if 'MODULE' is defined, '.remove = sprd_pcie_remove',
> else '.remove = NULL'.
> I would appreciate hearing your opinion about this.

If module not defined, these .probe and .remove won't be called.

>
> > > +     .driver = {
> > > +             .name = "sprd-pcie",
> > > +             .of_match_table = sprd_pcie_of_match,
> > > +     },
> > > +};
> > > +
> > > +module_platform_driver(sprd_pcie_driver);
> > > +
> > > +MODULE_DESCRIPTION("Unisoc PCIe host controller driver");
> > > +MODULE_LICENSE("GPL v2");
> >
> > I think that it needs to be "GPL" and not "GPL v2".
> >
>
> Many platform drivers use 'GPL v2', but others use 'GPL'.
> I am not sure whether to use 'GPL' or 'GPL v2'.
> Could you tell me why ‘GPL’ is needed here?

Because GPL already means v2, see Documentation/process/license-rules.rst

  447
  448     "GPL v2"                      Same as "GPL". It exists for historic
  449                                   reasons.


>
> > Thanks
> >
> > > --
> > > 2.7.4
> > >