linux-kernel - Re: Purpose of pci_remap

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Message-ID: <20160714152714.GD30657@red-moon>
Date:	Thu, 14 Jul 2016 16:27:14 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Liviu.Dudau@....com" <Liviu.Dudau@....com>,
	nofooter <nofooter@...inx.com>,
	"thomas.petazzoni@...e-electrons.com" 
	<thomas.petazzoni@...e-electrons.com>
Subject: Re: Purpose of pci_remap_iospace

On Thu, Jul 14, 2016 at 05:12:01PM +0200, Arnd Bergmann wrote:
> On Thursday, July 14, 2016 3:56:24 PM CEST Lorenzo Pieralisi wrote:
> > On Thu, Jul 14, 2016 at 01:32:13PM +0000, Bharat Kumar Gogada wrote:
> > 
> > [...]
> > 
> > > Hi Lorenzo,
> > > 
> > > I missed something in my device tree now I corrected it.
> > > 
> > > ranges = <0x01000000 0x00000000 0xe0000000 0x00000000 0xe0000000 0 0x00010000   //io
> > 
> > You have not missed anything, you changed the PCI bus address at
> > which your host bridge responds to IO space and it must match
> > your configuration.
> 
> I'd always recommend mapping the I/O space to PCI address zero, but
> evidently the hardware is not configured that way here.

+1 and it is a message that must be heeded by Xiling folks before
merging the host controller changes and respective DT bindings/dts.

Lorenzo