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iio: frequency: ADF4350: Fix potential reference div factor overflow.

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With small channel spacing values and high reference frequencies it is
possible to exceed the range of the 10-bit counter.
Workaround by checking the range and widening some constrains.

We don't use the REG1_PHASE value in this case the datasheet recommends to set
it to 1 if not used.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Michael Hennerich 2012-07-20 09:31:00 +01:00 • committed by Jonathan Cameron
parent dfffd0d65f
commit 8857df3ace
2 changed files with 17 additions and 9 deletions
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2
include/linux/iio/frequency/adf4350.h
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@ -87,6 +87,8 @@
#define ADF4350_MAX_BANDSEL_CLK 125000 /* Hz */
#define ADF4350_MAX_FREQ_REFIN 250000000 /* Hz */
#define ADF4350_MAX_MODULUS 4095
#define ADF4350_MAX_R_CNT 1023
/**
* struct adf4350_platform_data - platform specific information