Re: [PATCH/RFC] SPI: add DMAUNSAFE analog

[David Brownell]

On Wednesday 14 December 2005 9:53 am, Vitaly Wool wrote:
> Greg KH wrote:
> 
> >What is the speed of your SPI bus?
> >
> >And what are your preformance requirements?
> >  
> >
> The maximum frequency for the SPI bus is 26 MHz, WLAN driver is to work 
> at true 10 Mbit/sec.

Some SPI flash chips are rated at 60 MHz ... there's no "official"
standard placing such limits on SPI.

The various IEEE 802.15.4 (ZigBee) transceivers seem to take up
to 10 MHz clocks, FWIW.  USB controllers, 12 MHz (surprise!  they
are of course full speed, 12 MHz).

Sensors with A-to-D converters are often lower rate; only 100K
samples per second, say, at maybe 12 bits each; more like 2 MHz.

- Dave
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