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| author | Bhanu Seshu Kumar Valluri <bhanuseshukumar@gmail.com> | 2025-11-13 12:19:37 +0530 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2025-12-16 21:23:20 +0530 |
| commit | 08be54a9e56f9523b50d1923a94a48ef5890c0bc (patch) | |
| tree | ee07a7af6efd6446c6ab95f8765b508581bc420f /Documentation/driver-api/dmaengine | |
| parent | f94163e950c9568fe2d2d88317d9602ce021e646 (diff) | |
docs: dmaengine: add explanation for phys field in dma_async_tx_descriptor structure
Describe the need to initialize the phys field in the dma_async_tx_descriptor
structure during its initialization.
Signed-off-by: Bhanu Seshu Kumar Valluri <bhanuseshukumar@gmail.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://patch.msgid.link/20251113064937.8735-1-bhanuseshukumar@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'Documentation/driver-api/dmaengine')
| -rw-r--r-- | Documentation/driver-api/dmaengine/provider.rst | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/driver-api/dmaengine/provider.rst b/Documentation/driver-api/dmaengine/provider.rst index 1594598b3317..f4ed98f701c9 100644 --- a/Documentation/driver-api/dmaengine/provider.rst +++ b/Documentation/driver-api/dmaengine/provider.rst @@ -411,7 +411,7 @@ supported. - This structure can be initialized using the function ``dma_async_tx_descriptor_init``. - - You'll also need to set two fields in this structure: + - You'll also need to set following fields in this structure: - flags: TODO: Can it be modified by the driver itself, or @@ -421,6 +421,9 @@ supported. that is supposed to push the current transaction descriptor to a pending queue, waiting for issue_pending to be called. + - phys: Physical address of the descriptor which is used later by + the dma engine to read the descriptor and initiate transfer. + - In this structure the function pointer callback_result can be initialized in order for the submitter to be notified that a transaction has completed. In the earlier code the function pointer |