linux-kernel - Re: [PATCH v2 2/4] dma: move dw_dmac driver to an own directory

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Message-ID: <20130612075225.GI4107@intel.com>
Date:	Wed, 12 Jun 2013 13:22:25 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	spear-devel <spear-devel@...t.st.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...com>
Subject: Re: [PATCH v2 2/4] dma: move dw_dmac driver to an own directory

On Wed, Jun 12, 2013 at 11:27:51AM +0300, Andy Shevchenko wrote:
> On Wed, Jun 12, 2013 at 10:39 AM, Vinod Koul <vinod.koul@...el.com> wrote:
> > On Wed, Jun 12, 2013 at 10:43:29AM +0300, Andy Shevchenko wrote:
> >> On Wed, Jun 12, 2013 at 8:08 AM, Vinod Koul <vinod.koul@...el.com> wrote:
> >> > On Wed, Jun 05, 2013 at 03:26:44PM +0300, Andy Shevchenko wrote:
> 
> []
> 
> > Something like
> > config DW_DMAC_BIG_ENDIAN_IO
> >         tristate
> >
> > config DW_DMAC
> >         select DW_DMAC_BIG_ENDIAN_IO
> >
> > I belive DW_DMAC is for AVR support and the PCI ones is different right.
> > The point is that these things should be selected by the required symbols based
> > on what ARCH we are on and not be prompted for user to configure via menuconfig
> 
> DW_DMAC is a generic platform driver which supports AVR32, ARM and
> Intel (ACPI case) platforms.
> 
> We may do that option invisible to user
Yup
> 
> and then use
> 
> config DW_DMAC
>          select DW_DMAC_BIG_ENDIAN_IO if ARCH=AVR32
Thats would be the right way
> 
> I don't know if we will have any platform in future which has such
> difference in endianess between CPU and DMA IP block.
you never know what h/w designers would think!

--
~Vinod
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