linux-kernel - Re: [PATCH v2 1/2] dw_dmac: make driver endianness configurable

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Date:	Thu, 30 Aug 2012 19:57:09 +0000
From:	Arnd Bergmann <arnd.bergmann@...aro.org>
To:	Hein Tibosch <hein_tibosch@...oo.es>
Cc:	viresh kumar <viresh.kumar@...aro.org>,
	"spear-devel" <spear-devel@...t.st.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"ludovic.desroches" <ludovic.desroches@...el.com>,
	Havard Skinnemoen <havard@...nnemoen.net>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	"Hans-Christian Egtvedt" <egtvedt@...fundet.no>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 1/2] dw_dmac: make driver endianness configurable

On Thursday 30 August 2012, Hein Tibosch wrote:
> The dw_dmac was originally developed for avr32 to be used with the
> Synopsys DesignWare AHB DMA controller. After 2.6.38, device access was done
> with the little-endian readl/writel functions. This didn't work on the
> avr32 platform, because it needs native-endian (i.e. big-endian) accessors.
> This patch makes the endianness configurable using 'DW_DMAC_BIG_ENDIAN_IO',
> which will default be true for AVR32
> 
> 
> Signed-off-by: Hein Tibosch <hein_tibosch@...oo.es>

Acked-by: Arnd Bergmann <arnd.bergmann@...aro.org>
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