This is a note to let you know that I've just added the patch titled
iio: adc: ad7380: fix SPI offload trigger rate
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 632757312d7eb320b66ca60e0cfe098ec53cee08 Mon Sep 17 00:00:00 2001 From: David Lechner dlechner@baylibre.com Date: Fri, 19 Sep 2025 15:50:34 -0500 Subject: 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 --- drivers/iio/adc/ad7380.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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);