diff options
| author | David Lechner <dlechner@baylibre.com> | 2025-02-07 23:09:05 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2025-02-10 21:47:29 +0300 |
| commit | 4fe7fd17fe66a5e243c1de7ff32c29fac7039b8d (patch) | |
| tree | c6d4718ac752bf56a50eea07e937f9986a80d472 /include/linux/iio/buffer-dmaengine.h | |
| parent | a570114db8ead2e0d90a63888b8e269878ab502f (diff) | |
| download | linux-4fe7fd17fe66a5e243c1de7ff32c29fac7039b8d.tar.xz | |
iio: buffer-dmaengine: split requesting DMA channel from allocating buffer
Refactor the IIO dmaengine buffer code to split requesting the DMA
channel from allocating the buffer. We want to be able to add a new
function where the IIO device driver manages the DMA channel, so these
two actions need to be separate.
To do this, calling dma_request_chan() is moved from
iio_dmaengine_buffer_alloc() to iio_dmaengine_buffer_setup_ext(). A new
__iio_dmaengine_buffer_setup_ext() helper function is added to simplify
error unwinding and will also be used by a new function in a later
patch.
iio_dmaengine_buffer_free() now only frees the buffer and does not
release the DMA channel. A new iio_dmaengine_buffer_teardown() function
is added to unwind everything done in iio_dmaengine_buffer_setup_ext().
This keeps things more symmetrical with obvious pairs alloc/free and
setup/teardown.
Calling dma_get_slave_caps() in iio_dmaengine_buffer_alloc() is moved so
that we can avoid any gotos for error unwinding.
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250207-dlech-mainline-spi-engine-offload-2-v8-8-e48a489be48c@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'include/linux/iio/buffer-dmaengine.h')
| -rw-r--r-- | include/linux/iio/buffer-dmaengine.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/iio/buffer-dmaengine.h b/include/linux/iio/buffer-dmaengine.h index 81d9a19aeb91..72a2e3fd8a5b 100644 --- a/include/linux/iio/buffer-dmaengine.h +++ b/include/linux/iio/buffer-dmaengine.h @@ -12,7 +12,7 @@ struct iio_dev; struct device; -void iio_dmaengine_buffer_free(struct iio_buffer *buffer); +void iio_dmaengine_buffer_teardown(struct iio_buffer *buffer); struct iio_buffer *iio_dmaengine_buffer_setup_ext(struct device *dev, struct iio_dev *indio_dev, const char *channel, |