linux-kernel - Re: [RFC PATCH 1/2] PCI: designware: Add ARM64 PCI support

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Date:	Mon, 21 Apr 2014 18:58:52 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>,
	'Liviu Dudau' <Liviu.Dudau@....com>
Cc:	'linux-pci' <linux-pci@...r.kernel.org>,
	'Bjorn Helgaas' <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	'Kukjin Kim' <kgene.kim@...sung.com>,
	'Jason Gunthorpe' <jgunthorpe@...idianresearch.com>,
	'Mohit KUMAR DCG' <Mohit.KUMAR@...com>,
	'Pratyush Anand' <pratyush.anand@...com>,
	'Marek Vasut' <marex@...x.de>,
	'Richard Zhu' <r65037@...escale.com>,
	'Kishon Vijay Abraham I' <kishon@...com>,
	'Byungho An' <bh74.an@...sung.com>,
	'Rob Herring' <robherring2@...il.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [RFC PATCH 1/2] PCI: designware: Add ARM64 PCI support

On Monday, April 21, 2014 10:54 AM, Jingoo Han wrote:
> On Thursday, April 17, 2014 3:26 AM, Arnd Bergmann wrote:
> > On Wednesday 16 April 2014 17:57:24 Liviu Dudau wrote:
> > > Jingoo,
> > >
> > > Thanks for taking a stab at trying to convert a host bridge
> > > driver to use the new generic host bridge code.
> > >
> > > I do however have concerns on the direction you took. You have split
> > > your driver in two, depending on whether it was CONFIG_ARM or CONFIG_ARM64,
> > > even if (with my series) it should be no reason why the host bridge
> > > driver should not work on other architectures as well once they are
> > > converted.
> >
> > Right.
> >
> > > Also, some of the functions that you use have identical names but different
> > > signatures depending on what arch you have selected. This is really bad
> > > in my books!

[.....]

> > > What about creating functions that use my series directly if CONFIG_ARM64 is
> > > defined (or any CONFIG_ you want to create for your driver that you select
> > > from CONFIG_ARM64) and otherwise implement the CONFIG_ARM version? That
> > > way your driver will call only one API without any #ifdef and when arm code
> > > gets converted you drop your adaptation functions. Or (better yet), have a
> > > stab at converting bios32 (Rob Herring has already provided some hints on
> > > how to do it for arch/arm).
> 
> To: Liviu Dudau
> 
> Sorry, but I will not implement this.
> At first, you had to think the compatibility with ARM32 PCIe.
> Why do you want other engineers to take this load?

(+cc Rob Herring)

Um, I am looking at Rob Herring's patchset for Versatile PCI. [1]
Then, do you mean the following?

1. Add Rob Herring's patch converting bios32. [2]
2. Reference Rob Herring's patch in order to know how to
    handle "of_create_pci_host_bridge()" directly in ARM32. [3]
3. Use of_create_pci_host_bridge() for the designware PCIe
    driver in ARM32.
4. Also, use of_create_pci_host_bridge() for the designware PCIe
    driver in "ARM64".


[1] http://www.spinics.net/lists/linux-pci/msg30084.html
[2] http://www.spinics.net/lists/linux-pci/msg30083.html
[3] http://www.spinics.net/lists/linux-pci/msg30086.html

Best regards,
Jingoo Han

> 
> >
> > That would of course be best.
> >

[.....]

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