[PATCH] spi: bcm2835aux: Avoid 64-bit arithmetic in xfer len calc

[Mark Brown]

On Mon, Feb 12, 2018 at 11:38:14AM -0800, Trent Piepho wrote:
> We want to check for xfers that are over 30 microseconds.  Rather than
> find how many µs a xfer will take, instead find how many bytes can be
> transferred in 30 µs.  The latter must be less than 32 bits (since our
> clock speed is limited to 32 bits), while the former involves 64 bit
> quantities and more arithmetic operations.

Please don't bury patches in the middle of existing threads, it makes it
much harder to find them.
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