linux-kernel - Re: [PATCH v2 1/3] dmaengine: Add support for APM X-Gene SoC DMA engine driver

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Date:	Wed, 14 Jan 2015 12:54:25 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rameshwar Sahu <rsahu@....com>
Cc:	vinod.koul@...el.com, dan.j.williams@...el.com,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	ddutile@...hat.com, jcm@...hat.com, patches@....com,
	Loc Ho <lho@....com>
Subject: Re: [PATCH v2 1/3] dmaengine: Add support for APM X-Gene SoC DMA engine driver

On Wednesday 14 January 2015 14:56:33 Rameshwar Sahu wrote:
> 
> > Also add the correct dma-ranges property in the parent, or else this will
> > fail in the future once we add proper checks to dma_set_mask.
> 
> I see arch/arm64 kernel doesn't use dma range value parsed from
> dma-range property currently, I will check it more.
> It doesn't use dma_pfn_offset value calculated by the dma-ranges in
> dma mapping API.
> dma-ranges value should test properly before adding.
> Is there any use to add this dma-ranges properly if arch code doesn't support ??

Of course: the dt needs to describe the hardware correctly. This is
just a bug in the current arm64 code and it will soon be fixed.

	Arnd
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