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

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Date:	Wed, 12 Jun 2013 21:52:07 +0800
From:	Hein Tibosch <hein@...bosch.net>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:	Vinod Koul <vinod.koul@...el.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 6/12/2013 5:00 PM, Andy Shevchenko wrote:
> [+ 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
Yes sure! Avr32 users won't have any other choice as to select this option.

Hein

>>  	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

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