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 3f9be69499ec..d2aef511189a 100644 --- a/drivers/iio/frequency/ad9523.c +++ b/drivers/iio/frequency/ad9523.c @@ -862,9 +862,11 @@ 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
