linux-kernel - Re: [PATCH] Axi-usb: Add support for 64-bit addressing.

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Date:	Mon, 18 Apr 2016 16:35:07 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robh@...nel.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Nava kishore Manne <nava.manne@...inx.com>,
	mark.rutland@....com, devicetree@...r.kernel.org, navam@...inx.com,
	hyun.kwon@...inx.com, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, gregkh@...uxfoundation.org,
	radhey.shyam.pandey@...inx.com, michal.simek@...inx.com,
	balbi@...com, linux-kernel@...r.kernel.org, galak@...eaurora.org,
	soren.brinkmann@...inx.com
Subject: Re: [PATCH] Axi-usb: Add support for 64-bit addressing.

On Monday 18 April 2016 09:29:09 Rob Herring wrote:
> 
> Right, you don't need to know the exact bus width for determining the 
> register/descriptor set is 32 or 64 bit addesses. I'm fine with a 
> property for that, but if limiting the actual connected address bits is 
> needed, then dma-ranges should be used.

The other way round: dma-ranges is needed to allow 64-bit addressing,
the default is to only allow 32-bit addressing (and arm64 has a known
bug here, it just allows it anyway when it shouldn't).

	Arnd