linux-kernel - Re: [RFC PATCH v3 3/3] PCI/ACPI: hisi: Add ACPI support for HiSilicon SoCs Host Controllers

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Date:	Wed, 10 Feb 2016 11:12:34 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Gabriele Paoloni <gabriele.paoloni@...wei.com>
Cc:	"Guohanjun (Hanjun Guo)" <guohanjun@...wei.com>,
	"Wangzhou (B)" <wangzhou1@...ilicon.com>,
	"liudongdong (C)" <liudongdong3@...wei.com>,
	Linuxarm <linuxarm@...wei.com>, qiujiang <qiujiang@...wei.com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"Lorenzo.Pieralisi@....com" <Lorenzo.Pieralisi@....com>,
	"tn@...ihalf.com" <tn@...ihalf.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xuwei (O)" <xuwei5@...ilicon.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"jcm@...hat.com" <jcm@...hat.com>,
	zhangjukuo <zhangjukuo@...wei.com>,
	"Liguozhu (Kenneth)" <liguozhu@...ilicon.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 3/3] PCI/ACPI: hisi: Add ACPI support for
 HiSilicon SoCs Host Controllers

On Wed, Feb 10, 2016 at 09:52:36AM +0000, Gabriele Paoloni wrote:
> Hi Mark
> 
> > On Tue, Feb 09, 2016 at 05:34:20PM +0000, Gabriele Paoloni wrote:
> > > From: gabriele paoloni <gabriele.paoloni@...wei.com>
> > > +/*
> > > + * Retrieve rc_dbi base and size from _DSD
> > > + * Name (_DSD, Package () {
> > > + *	ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> > > + *	Package () {
> > > + *	Package () {"rc-dbi", Package () { 0x0, 0xb0080000, 0x0, 0x10000
> > }},
> > > + *	}
> > > + *	})
> > > + */
> > 
> > As above, this does not look right. ACPI has standard mechanisms for
> > describing addresses. Making something up like this is not a good idea.
>  
> I am quite new to ACPI, may I ask you to explain a bit? 

ACPI has standard mechanisms for describing certain resources, and these
should not be described in _DSD. Memory or IO address regions are such
resources (in _CRS, IIRC), and should not be described in _DSD.

Thanks,
Mark.