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dmaengine: of-dma: Add support for optional router configuration callback

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Additional configuration for the DMA event router might be needed for a
channel which can not be done during device_alloc_chan_resources callback
since the router information is not yet present for the drivers.

If there is a need for additional configuration for the channel if DMA
router is in use, then the driver can implement the device_router_config
callback.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201208090440.31792-8-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Peter Ujfalusi 2020-12-08 11:04:27 +02:00 • committed by Vinod Koul
parent d553e2ab01
commit 4f910c035f
2 changed files with 12 additions and 0 deletions
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2
include/linux/dmaengine.h
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@ -805,6 +805,7 @@ struct dma_filter {
* by tx_status
* @device_alloc_chan_resources: allocate resources and return the
* number of allocated descriptors
* @device_router_config: optional callback for DMA router configuration
* @device_free_chan_resources: release DMA channel's resources
* @device_prep_dma_memcpy: prepares a memcpy operation
* @device_prep_dma_xor: prepares a xor operation
@ -879,6 +880,7 @@ struct dma_device {
enum dma_residue_granularity residue_granularity;
int (*device_alloc_chan_resources)(struct dma_chan *chan);
int (*device_router_config)(struct dma_chan *chan);
void (*device_free_chan_resources)(struct dma_chan *chan);
struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(