From: Nuno Sa <nuno.sa@xxxxxxxxxx> Since we allow to change the sampling frequency and do it with clk_round_rate(), we can cache it and use on the read_raw() interface. This will also be useful in a following patch supporting interface calibration. Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx> --- drivers/iio/adc/ad9467.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index 7475ec2a56c72..7db87ccc1ea4b 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -117,6 +117,7 @@ struct ad9467_state { struct iio_backend *back; struct spi_device *spi; struct clk *clk; + unsigned long sample_rate; unsigned int output_mode; unsigned int (*scales)[2]; @@ -331,7 +332,7 @@ static int ad9467_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_SCALE: return ad9467_get_scale(st, val, val2); case IIO_CHAN_INFO_SAMP_FREQ: - *val = clk_get_rate(st->clk); + *val = st->sample_rate; return IIO_VAL_INT; default: @@ -346,6 +347,7 @@ static int ad9467_write_raw(struct iio_dev *indio_dev, struct ad9467_state *st = iio_priv(indio_dev); const struct ad9467_chip_info *info = st->info; long r_clk; + int ret; switch (mask) { case IIO_CHAN_INFO_SCALE: @@ -358,7 +360,12 @@ static int ad9467_write_raw(struct iio_dev *indio_dev, return -EINVAL; } - return clk_set_rate(st->clk, r_clk); + ret = clk_set_rate(st->clk, r_clk); + if (ret) + return ret; + + st->sample_rate = r_clk; + return 0; default: return -EINVAL; } @@ -543,6 +550,8 @@ static int ad9467_probe(struct spi_device *spi) if (IS_ERR(st->clk)) return PTR_ERR(st->clk); + st->sample_rate = clk_get_rate(st->clk); + st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown", GPIOD_OUT_LOW); if (IS_ERR(st->pwrdown_gpio)) -- 2.44.0