diff options
| author | David Lechner <dlechner@baylibre.com> | 2025-09-19 15:50:34 -0500 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2025-10-13 08:38:08 +0100 |
| commit | 632757312d7eb320b66ca60e0cfe098ec53cee08 (patch) | |
| tree | e687fad277525ad2a80f665c2dca6e06d7fa37cd | |
| parent | 9b45744bf09fc2a3287e05287141d6e123c125a7 (diff) | |
iio: adc: ad7380: fix SPI offload trigger rate
Add a special case to double the SPI offload trigger rate when all
channels of a single-ended chip are enabled in a buffered read.
The single-ended chips in the AD738x family can only do simultaneous
sampling of half their channels and have a multiplexer to allow reading
the other half. To comply with the IIO definition of sampling_frequency,
we need to trigger twice as often when the sequencer is enabled to so
that both banks can be read in a single sample period.
Fixes: bbeaec81a03e ("iio: ad7380: add support for SPI offload")
Signed-off-by: David Lechner <dlechner@baylibre.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
| -rw-r--r-- | drivers/iio/adc/ad7380.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c index fa251dc1aae6..bfd908deefc0 100644 --- a/drivers/iio/adc/ad7380.c +++ b/drivers/iio/adc/ad7380.c @@ -1227,6 +1227,14 @@ static int ad7380_offload_buffer_postenable(struct iio_dev *indio_dev) if (ret) return ret; + /* + * When the sequencer is required to read all channels, we need to + * trigger twice per sample period in order to read one complete set + * of samples. + */ + if (st->seq) + config.periodic.frequency_hz *= 2; + ret = spi_offload_trigger_enable(st->offload, st->offload_trigger, &config); if (ret) spi_unoptimize_message(&st->offload_msg); |