From: Lars-Peter Clausen <lars@xxxxxxxxxx> To improve the accuracy of the reported VCO frequency perform all multiplications before divisions. This reduces rounding errors and makes sure the reported rates are accurate down to the last digit. Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> --- drivers/iio/frequency/ad9523.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c index 246e38d76eff..541cb5975dd9 100644 --- a/drivers/iio/frequency/ad9523.c +++ b/drivers/iio/frequency/ad9523.c @@ -1140,9 +1140,11 @@ static int ad9523_setup(struct iio_dev *indio_dev) if (ret < 0) return ret; - st->vco_freq = (pdata->vcxo_freq * (pdata->pll2_freq_doubler_en ? 2 : 1) - / pdata->pll2_r2_div) * AD9523_PLL2_FB_NDIV(pdata-> - pll2_ndiv_a_cnt, pdata->pll2_ndiv_b_cnt); + st->vco_freq = div_u64((unsigned long long)pdata->vcxo_freq * + (pdata->pll2_freq_doubler_en ? 2 : 1) * + AD9523_PLL2_FB_NDIV(pdata->pll2_ndiv_a_cnt, + pdata->pll2_ndiv_b_cnt), + pdata->pll2_r2_div); ret = ad9523_write(indio_dev, AD9523_PLL2_VCO_CTRL, AD9523_PLL2_VCO_CALIBRATE); -- 2.17.1
