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

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Message-ID: <1371027632.29283.332.camel@smile>
Date:	Wed, 12 Jun 2013 12:00:32 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	"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>,
	Hein Tibosch <hein@...bosch.net>
Subject: Re: [PATCH v2 2/4] dma: move dw_dmac driver to an own directory

[+ Hein]

On Wed, 2013-06-12 at 13:42 +0530, Vinod Koul wrote: 
> On Wed, Jun 12, 2013 at 11:38:37AM +0300, Andy Shevchenko wrote:
> > On Wed, Jun 12, 2013 at 10:52 AM, Vinod Koul <vinod.koul@...el.com> wrote:
> > > 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:
> > >>
> > >> []
> > >>
> > >> > 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
> > 
> > Do you prefer to have this as separate patch or integrated in the split?
> > In my humble opinion I better to do separate patch.
> Never mind, am applying your patches and below fix, let me if you guys are okay


As far as I know we have at least one developer (Hein Tibosch) with such
board. Let him share his opinion.

> 
> diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig
> index db2b41f..7be1cf8 100644
> --- a/drivers/dma/dw/Kconfig
> +++ b/drivers/dma/dw/Kconfig
> @@ -10,6 +10,7 @@ config DW_DMAC_CORE
>  config DW_DMAC
>  	tristate "Synopsys DesignWare AHB DMA platform driver"
>  	select DW_DMAC_CORE
> +	select DW_DMAC_BIG_ENDIAN_IO if ARCH=AVR32
>  	default y if CPU_AT32AP7000
>  	help
>  	  Support the Synopsys DesignWare AHB DMA controller. This
> @@ -25,12 +26,4 @@ config DW_DMAC_PCI
>  	  Intel Medfield has integrated this GPDMA controller.
>  
>  config DW_DMAC_BIG_ENDIAN_IO
> -	bool "Use big endian I/O register access"
> -	default y if AVR32
> -	depends on DW_DMAC_CORE
> -	help
> -	  Say yes here to use big endian I/O access when reading and writing
> -	  to the DMA controller registers. This is needed on some platforms,
> -	  like the Atmel AVR32 architecture.
> -
> -	  If unsure, use the default setting.
> +	bool
> -
> 
> --
> ~Vinod

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