The point of this commit is to allow users to request specific
channels. The following code snippet shows how this may now be
achieved:
int requested_channel = 5;
int ret = dma_request_channel(dev, &requested_channel);
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Currently, the number of channels supported by the controlled
is computed based on the size of the channel array. This
works well only if there's no gaps (i.e: "dma-channels" property
is used or "valid-channels" property is used with contiguous
channels) but will break if there are any gaps. For instance,
if the user wants to use channels 16 and 17 and specifies them
through the "valid-channels" property, they won't be allowed
to do so because dma_request_channels() will stop at channel 1.
As such, to fix this, simply use the number of channels from
the HAL configuration which is the maximum number of channels.
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
This commit introduces a driver for NXP's eDMA IP.
The main reasons for introducing a new driver are the following:
1) The HAL EDMA wrappers don't support well different
eDMA versions (e.g: i.MX93 and i.MX8QM). As such, a new
revision had to be introduced, thus requiring a new Zephyr
driver.
2) The eDMA versions found on i.MX93, i.MX8QM, and i.MX8QXP
don't use the DMAMUX IP (instead, channel MUX-ing is performed
through an eDMA register in the case of i.MX93).
Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
