linux-kernel - Re: [Resend: PATCH v2 0/3] Fix rcar-pcie for arm64

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Date:	Wed, 9 Dec 2015 10:59:54 -0600
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Phil Edworthy <phil.edworthy@...esas.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Simon Horman <horms@...ge.net.au>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Resend: PATCH v2 0/3] Fix rcar-pcie for arm64

On Thu, Nov 26, 2015 at 08:32:43AM +0000, Phil Edworthy wrote:
> HI Bjorn,
> 
> On 25 November 2015 16:41, Bjorn Helgaas wrote:
> > Hi Phil,
> > 
> > On Wed, Nov 25, 2015 at 03:30:36PM +0000, Phil Edworthy wrote:
> > > The first patches fixes the build problem
> > 
> > I'm trying to figure out if v4.4 has a build problem we need to fix.
> > If I understand correctly, "PCI: rcar: Convert to DT resource parsing
> > API" doesn't fix a build problem in the current tree; rather, it
> > removes a dependency on ARM so that we can build it on ARM64.
> v4.4 doesn't have a build problem because commit 7c537c67d2e4 ensures
> it doesn't get built on arm64. If we revert this commit, then there is a
> build failure as the pci_ioremap_io() function is not available on arm64.
> That's the build failure which "PCI: rcar: Convert to DT resource parsing API"
> fixes.
> 
> > > , and the second patch reverts the
> > > patch that removed the driver from arm64 builds. The final patch add a compat
> > > string for the r8a7795 (arm64) device.
> > >
> > > Tested on arm Koelsch board, all ok.
> > >
> > > Tested on arm64 Salvator-X board using renesas-drivers-2015-10-27-v4.3-rc7
> > from
> > > git://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git with
> > PCI
> > > next merged.
> > > Apart from patches to add the PCIe clock and DT nodes, it also needs this fix:
> > > ("PCI: MSI: Only use the generic MSI layer when domain is hierarchical")
> > 
> > I assume you mean this one from Marc: https://lkml.org/lkml/2015/11/23/388
> > (Was that posted to linux-pci?  I don't see it in patchwork or my
> > linux-pci archives, so I hadn't seen it yet.)
> Ok, yes that's the patch.
> 
> > How exactly is that related to this series?  If I merge these before
> > Marc's change, do we have a tree that builds for arm64 but doesn't
> > work?
> Correct.

OK, great!  I just asked Linus to pull that patch (3845d2953aac ("PCI/MSI:
Only use the generic MSI layer when domain is hierarchical")) for v4.4, so
these changes will be merged after that one.

I put all three of these on pci/host-rcar for v4.5.

Simon, I only see your explicit ack on the first one, but I assume you're
OK with all three.  Let me know if otherwise.

> > What about the PCIe clock and DT changes you mention?  Is there a
> > reason to keep them separate?  Would it be feasible to include the DT
> > changes in the same patch as the driver change that uses those
> > changes?
> The approach for all other drivers has been to keep these separate. There
> are no changes to the dt bindings, it's just adding the node to the new
> device and board, so there is no problem with ordering of these patches.
> 
> Thanks
> Phil
> 
> > Bjorn
> > 
> > > Resent with whole series marked as v2 and acks, etc added.
> > >
> > > Harunobu Kurokawa (1):
> > >   PCI: pcie-rcar: Add support for R-Car H3.
> > >
> > > Phil Edworthy (2):
> > >   PCI: rcar: Convert to DT resource parsing API
> > >   Revert "PCI: rcar: Build pcie-rcar.c only on ARM"
> > >
> > >  Documentation/devicetree/bindings/pci/rcar-pci.txt |   3 +-
> > >  drivers/pci/host/Kconfig                           |   3 +-
> > >  drivers/pci/host/pcie-rcar.c                       | 117 +++++++++++++--------
> > >  3 files changed, 77 insertions(+), 46 deletions(-)
> > >
> > > --
> > > 2.5.0
> > >
> > > --
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