Re: mcspi

[maxim maxim <look2004il-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Thanks Gerhard, good idea,  it's working fine for me:)

Best Regards,
Kol

2014-04-07 15:53 GMT+03:00 Gerhard Sittig <gsi-ynQEQJNshbs@public.gmane.org>:
> On Sat, 2014-04-05 at 16:05 +0300, maxim maxim wrote:
>>
>>  I'm working with omap 3 spi driver, in the base I have mcspi driver
>> for tach device(http://processors.wiki.ti.com/index.php/AM335x_McSPI_Driver's_Guide),
>> I want to add my insmod driver for ublox 6(gps device). From ublox6
>> datasheet I saw what I need some initial delay between chip select
>> activation and data sending, I didn't find a way how to do it from
>> Linux SPI Framework, because of this I tried to write directly to some
>> registers what mapped in mcspi driver I can accept their mapped
>> address from contoller_data , but unfortunately it didn't work, may be
>> here you could give me some avices how I can do it.
>
> You might create an SPI message from multiple transfers, where
> the first has no data (length zero) but specifies a delay.  If
> the SPI controller's driver is implemented correctly, or if it
> uses the SPI subsystem's common logic, this should result in the
> desired pause between CS assertion and data transfer.
>
> If it doesn't work out for you (when the driver cuts corners,
> violates the API semantics, or tries to outsmart you), you may
> want to fix that and provide patches. :)
>
>
> virtually yours
> Gerhard Sittig
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