On Wed, 23 Oct 2024 15:59:17 -0500
David Lechner <dlechner@xxxxxxxxxxxx> wrote:
> The iio_dmaengine_buffer_setup_ext() function is public and should be
> documented. Also, while touching this, fix the description of @dev in
> related functions. @dev does not strictly have to be the parent of the
> IIO device. It is only passed to dma_request_chan() so strictly
> speaking, it can be any device that is a valid DMA channel consumer.
>
> Signed-off-by: David Lechner <dlechner@xxxxxxxxxxxx>
> ---
>
> v4 changes:
> * This patch is new in v4.
>
> Jonathan, I think this patch stands on its own if you want to take it
> earlier than the rest of this series.
I may do at some point, but want a few more eyes on it first so let's leave
it here for now.
Seems fine to me.
> ---
> drivers/iio/buffer/industrialio-buffer-dmaengine.c | 19 +++++++++++++++++--
> 1 file changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/buffer/industrialio-buffer-dmaengine.c b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> index 19af1caf14cd..054af21dfa65 100644
> --- a/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> +++ b/drivers/iio/buffer/industrialio-buffer-dmaengine.c
> @@ -206,7 +206,7 @@ static const struct iio_dev_attr *iio_dmaengine_buffer_attrs[] = {
>
> /**
> * iio_dmaengine_buffer_alloc() - Allocate new buffer which uses DMAengine
> - * @dev: Parent device for the buffer
> + * @dev: DMA channel consumer device
> * @channel: DMA channel name, typically "rx".
> *
> * This allocates a new IIO buffer which internally uses the DMAengine framework
> @@ -288,6 +288,21 @@ void iio_dmaengine_buffer_free(struct iio_buffer *buffer)
> }
> EXPORT_SYMBOL_NS_GPL(iio_dmaengine_buffer_free, IIO_DMAENGINE_BUFFER);
>
> +/**
> + * iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
> + * @dev: DMA channel consumer device
> + * @indio_dev: IIO device to which to attach this buffer.
> + * @channel: DMA channel name, typically "rx".
> + * @dir: Direction of buffer (in or out)
> + *
> + * This allocates a new IIO buffer with devm_iio_dmaengine_buffer_alloc()
> + * and attaches it to an IIO device with iio_device_attach_buffer().
> + * It also appends the INDIO_BUFFER_HARDWARE mode to the supported modes of the
> + * IIO device.
> + *
> + * Once done using the buffer iio_dmaengine_buffer_free() should be used to
> + * release it.
> + */
> struct iio_buffer *iio_dmaengine_buffer_setup_ext(struct device *dev,
> struct iio_dev *indio_dev,
> const char *channel,
> @@ -321,7 +336,7 @@ static void __devm_iio_dmaengine_buffer_free(void *buffer)
>
> /**
> * devm_iio_dmaengine_buffer_setup_ext() - Setup a DMA buffer for an IIO device
> - * @dev: Parent device for the buffer
> + * @dev: Device for devm ownership and DMA channel consumer device
> * @indio_dev: IIO device to which to attach this buffer.
> * @channel: DMA channel name, typically "rx".
> * @dir: Direction of buffer (in or out)
>
