linux-kernel - RE: [PATCH v10 4/6] PCI: hisi: Add PCIe host support for HiSilicon SoC Hip05

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Message-ID: <EE11001F9E5DDD47B7634E2F8A612F2E162428B1@lhreml503-mbs>
Date:	Tue, 13 Oct 2015 06:58:42 +0000
From:	Gabriele Paoloni <gabriele.paoloni@...wei.com>
To:	"Wangzhou (B)" <wangzhou1@...ilicon.com>,
	Bjorn Helgaas <helgaas@...nel.org>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"jingoohan1@...il.com" <jingoohan1@...il.com>,
	"pratyush.anand@...il.com" <pratyush.anand@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"thomas.petazzoni@...e-electrons.com" 
	<thomas.petazzoni@...e-electrons.com>,
	"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
	"james.morse@....com" <james.morse@....com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"robh@...nel.org" <robh@...nel.org>,
	"gabriel.fernandez@...aro.org" <gabriel.fernandez@...aro.org>,
	"Minghuan.Lian@...escale.com" <Minghuan.Lian@...escale.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	zhangjukuo <zhangjukuo@...wei.com>,
	qiuzhenfa <qiuzhenfa@...ilicon.com>,
	"liudongdong (C)" <liudongdong3@...wei.com>,
	qiujiang <qiujiang@...wei.com>,
	"xuwei (O)" <xuwei5@...ilicon.com>,
	"Liguozhu (Kenneth)" <liguozhu@...ilicon.com>,
	"Wangkefeng (Kevin)" <wangkefeng.wang@...wei.com>,
	Rob Herring <robh+dt@...nel.org>
Subject: RE: [PATCH v10 4/6] PCI: hisi: Add PCIe host support for HiSilicon
 SoC Hip05


> >> +
> >> +static int __init hisi_pcie_init(void)
> >> +{
> >> +	return platform_driver_probe(&hisi_pcie_driver, hisi_pcie_probe);
> >> +}
> >> +subsys_initcall(hisi_pcie_init);
> >
> > Can you use module_platform_driver() or module_platform_driver_probe()
> > here instead of the subsys_initcall()?  No, I don't really know what
> > the difference between module_platform_driver() and
> > module_platform_driver_probe() is, sorry :)
> 
> In fact, I used module_platform_driver_probe in previous version, but
> A PCIe VGA card of HiSilicon will use Hip05 PCIe host, so we modified
> module_platform_driver_probe to subsys_initcall which will be called
> before module_platform_driver_probe.
> 
> We will upstream the driver of above PCIe VGA card soon.
> 
> Many thanks for your reviewing,
> Zhou

Hi Bjorn, firstly many thanks for looking at this.

About this last bit the reason why we use subsys_initcall() is that
our host bridge is embedded in the SoC and as such is not hot-pluggable
for instance see:
http://lxr.free-electrons.com/source/Documentation/driver-model/platform.txt#L59

Our approach is also used by Exynos:
http://lxr.free-electrons.com/source/drivers/pci/host/pci-exynos.c#L644

Cheers

Gab

> 
> >
> > Bjorn
> >
> > .
> >
> 

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