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

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Message-ID: <537B4D55.5040804@elopez.com.ar>
Date:	Tue, 20 May 2014 09:40:53 -0300
From:	Emilio López <emilio@...pez.com.ar>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:	linux-sunxi@...glegroups.com,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	kevin.z.m.zh@...il.com, sunny@...winnertech.com,
	shuge@...winnertech.com, zhuzhenhua@...winnertech.com,
	andriy.shevchenko@...el.com, Arnd Bergmann <arnd@...db.de>
Subject: Re: [linux-sunxi] [PATCH v7] DMA: sun6i: Add driver for the Allwinner
 A31 DMA controller

Hi Maxime,

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.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> ---
(snip)
> 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

> +	help
> +	  Support for the DMA engine for Allwinner A31 SoCs.
> +
>   config DMA_ENGINE
>   	bool

Cheers,

Emilio

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