linux-kernel - Re: [PATCH] PCI: remove unnecessary check of device

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Message-ID: <20180920090222.GA17617@arm.com>
Date:   Thu, 20 Sep 2018 10:02:22 +0100
From:   Will Deacon <will.deacon@....com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Rob Herring <robh@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alan Douglas <adouglas@...ence.com>,
        Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>,
        Michal Simek <michal.simek@...inx.com>,
        linux-pci@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] PCI: remove unnecessary check of device_type == pci

On Wed, Sep 19, 2018 at 05:33:01PM +0100, Lorenzo Pieralisi wrote:
> On Tue, Sep 18, 2018 at 12:05:40PM -0700, Rob Herring wrote:
> > On Thu, Sep 13, 2018 at 7:51 AM Lorenzo Pieralisi
> > <lorenzo.pieralisi@....com> wrote:
> > >
> > > On Wed, Aug 29, 2018 at 01:34:40PM -0500, Rob Herring wrote:
> > > > PCI host drivers have already matched on compatible strings, so checking
> > > > device_type is redundant. Also, device_type is considered deprecated for
> > > > FDT though we've still been requiring it for PCI hosts as it is useful
> > > > for finding PCI buses.
> > >
> > > Hi Rob,
> > >
> > > I have no problem with the patch per-se, I can't parse though the second
> > > paragraph, in particular what you mean by "useful for finding PCI
> > > buses".
> > 
> > Device_type is the only generic way we can identify PCI buses which is
> > useful for dtc for example to do PCI binding checks. Maybe we can use
> > the node name which is what I'm doing for cpu nodes, but we've been
> > less consistent about that for PCI.
> > 
> > >
> > > What about the corresponding dts files ? I suspect we had better leave
> > > them alone lest we can trigger regressions with new dts and older
> > > kernels.
> > 
> > Yes. it will take some time before we can remove from dts files. Or
> > maybe only new ones change.
> 
> OK, thanks. What about PCI host controllers bindings ? I assume we leave
> the bindings (that enforce device_type) unchanged too.
> 
> If Will and Michal have no objections I will queue this patch as-is
> for v4.20.

Fine by me!

Will