linux-kernel - Re: [linux-sunxi] [PATCH v7] DMA: sun6i: Add driver for the Allwinner A31 DMA controller

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Date:	Tue, 20 May 2014 12:52:34 +0000
From:	"Shevchenko, Andriy" <andriy.shevchenko@...el.com>
To:	"emilio@...pez.com.ar" <emilio@...pez.com.ar>
CC:	"Koul, Vinod" <vinod.koul@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"shuge@...winnertech.com" <shuge@...winnertech.com>,
	"linux-sunxi@...glegroups.com" <linux-sunxi@...glegroups.com>,
	"kevin.z.m.zh@...il.com" <kevin.z.m.zh@...il.com>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"sunny@...winnertech.com" <sunny@...winnertech.com>,
	"maxime.ripard@...e-electrons.com" <maxime.ripard@...e-electrons.com>,
	"zhuzhenhua@...winnertech.com" <zhuzhenhua@...winnertech.com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [linux-sunxi] [PATCH v7] DMA: sun6i: Add driver for the
 Allwinner A31 DMA controller

On Tue, 2014-05-20 at 09:40 -0300, Emilio López wrote:
> El 24/04/14 11:22, Maxime Ripard escribió:
> > The Allwinner A31 has a 16 channels DMA controller that it shares with the
> > newer A23. Although sharing some similarities with the DMA controller of the
> > older Allwinner SoCs, it's significantly different, I don't expect it to be
> > possible to share the driver for these two.
> >
> > The A31 Controller is able to memory-to-memory or memory-to-device transfers on
> > the 16 channels in parallel.

...

> > diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> > index 5c5863842de9..360a10c71388 100644
> > --- a/drivers/dma/Kconfig
> > +++ b/drivers/dma/Kconfig
> > @@ -361,6 +361,14 @@ config FSL_EDMA
> >   	  multiplexing capability for DMA request sources(slot).
> >   	  This module can be found on Freescale Vybrid and LS-1 SoCs.
> >
> > +config DMA_SUN6I
> > +	tristate "Allwinner A31 SoCs DMA support"
> > +	depends on ARCH_SUNXI
> > +	select DMA_ENGINE
> > +	select DMA_VIRTUAL_CHANNELS
> 
> I think you also need to select DMA_OF here as you are using 
> of_dma_controller_register

of_dma_controller_register should have a stub (which it does).
No need to have such a dependency.

-- 
Andy Shevchenko <andriy.shevchenko@...el.com>
Intel Finland Oy
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