[PATCH v1 1/4] davinci: da8xx/omap-l1: add support for SPI

[Michael Williamson]

On 2/2/2011 8:33 AM, Nori, Sekhar wrote:

> On Wed, Feb 02, 2011 at 18:25:22, Michael Williamson wrote:
> 
>>>> diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
>>>> index beda8a4..f421f97 100644
>>>> --- a/arch/arm/mach-davinci/devices-da8xx.c
>>>> +++ b/arch/arm/mach-davinci/devices-da8xx.c
>>>> @@ -725,3 +725,99 @@ int __init da8xx_register_cpuidle(void)
>>>>
>>>>       return platform_device_register(&da8xx_cpuidle_device);
>>>>   }
>>>> +
>>>> +static struct resource da8xx_spi0_resources[] = {
>>>> +    [0] = {
>>>> +        .start    = 0x01c41000,
>>>> +        .end    = 0x01c41fff,
>>>> +        .flags    = IORESOURCE_MEM,
>>>> +    },
>>>> +    [1] = {
>>>> +        .start    = IRQ_DA8XX_SPINT0,
>>>> +        .end    = IRQ_DA8XX_SPINT0,
>>>> +        .flags    = IORESOURCE_IRQ,
>>>> +    },
>>>> +    [2] = {
>>>> +        .start    = EDMA_CTLR_CHAN(0, 14),
>>>> +        .end    = EDMA_CTLR_CHAN(0, 14),
>>>> +        .flags    = IORESOURCE_DMA,
>>>> +    },
>>>> +    [3] = {
>>>> +        .start    = EDMA_CTLR_CHAN(0, 15),
>>>> +        .end    = EDMA_CTLR_CHAN(0, 15),
>>>> +        .flags    = IORESOURCE_DMA,
>>>> +    },
>>>
>>>    We have DA830_DMACH_SPI0_[RT]X defined for SPI0 DMA channels...
>>>
>>
>>
>> Right.  The current routines/structures were designed to support either da830 or
>> da850.  They work because the interrupts and the DMA channels are fortunately
>> the same for the SPI devices between the platforms.  I can use the DA830 enums, 
>> but I had preferred the clarity of the EDMA_CTRL_CHAN macro, and it would 
>> remove confusion that this might only apply for DA830 and not DA850.  It would
>> be nice to rename that DA8XX_DMAC_SPI_[RT]X if the enums were used...
>>
>> Can I leave this, or do you really want me to use the enums?
>>
> 
> Looks like a bunch of cleaning-up needs to happen in this area.
> The DA830_DMACH_* are not used anywhere at all. Instead most of
> devices-da8xx.c uses DMA channel numbers directly (except for ASP,
> which has them defined in asp.h).
> 


I did a quick check, a large volume of the #defines in the asp.h file
are only used in the platform setup.  Wondering if they should really
be in that file at all...

> Since all the platform device definitions for DA8XX devices happens
> in devices-da8xx.c, it makes sense to get rid of the DA830_DMACH_*
> enum altogether and instead just define the channel numbers used in
> devices-da8xx.c above the actual usage.
> 
> Mike, is that something you are willing take-up?
> 


I can take this up as a separate patch series. I'd like to keep the 
spi platform support series isolated to that subject matter, if that's
OK.

> Thanks,
> Sekhar
>