linux-kernel - Re: [PATCH V3] arm64: amd-seattle: Adding device tree for AMD Seattle platform

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Message-ID: <4486649.FEg9dS3gj1@wuerfel>
Date:	Thu, 20 Nov 2014 16:23:16 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robherring2@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <mark.rutland@....com>,
	Joel Schopp <Joel.Schopp@....com>,
	Thomas Lendacky <Thomas.Lendacky@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Liviu Dudau <liviu.dudau@....com>
Subject: Re: [PATCH V3] arm64: amd-seattle: Adding device tree for AMD Seattle platform

On Thursday 20 November 2014 09:16:31 Rob Herring wrote:
> 
> >> +             dma-coherent;
> >> +     };
> >
> > Same here: you list it as coherent, but not 64-bit DMA capable.
> > Is that intentional?
> 
> AHCI controllers are probeable as to whether they support 64-bit DMA or not.
> 

The controller is, but the bus is not, so we also need the dma-ranges
property in the bus.

	Arnd
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