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Introduce a basic framework for linked-list–based DMA controllers as a first step toward a common library. All DMA descriptors have a uniform size and are chained as follows: ┌──────┐ ┌──────┐ ┌──────┐ │ │ ┌─►│ │ ┌─►│ │ │ │ │ │ │ │ │ │ ├──────┤ │ ├──────┤ │ ├──────┤ │ Next ├─┘ │ Next ├─┘ │ Next │ └──────┘ └──────┘ └──────┘ The framework is derived from the fsl-edma implementation and provides common descriptor allocation/free and helpers for prep_memcpy(), prep_slave_sg(), and prep_slave_cyclic(). This patch series is based on: https://lore.kernel.org/dmaengine/20260114-dma_common_config-v1-0-64feb836ff04@nxp.com/ Additional functionality can be added if everyone agree on this method. Signed-off-by: Frank Li --- Frank Li (12): dmaengine: Extend virt_chan for link list based DMA engines dmaengine: Add common dma_ll_desc and dma_linklist_item for link-list controllers dmaengine: fsl-edma: Remove redundant echan from struct fsl_edma_desc dmaengine: fsl-edma: Use common dma_ll_desc in vchan dmaengine: Add DMA pool allocation in vchan_dma_ll_init() and API vchan_dma_ll_free() dmaengine: Move fsl_edma_(alloc|free)_desc() to common library dmaengine: virt-dma: split vchan_tx_prep() into init and internal helpers dmaengine: Factor out fsl-edma prep_memcpy into common vchan helper dmaengine: ll-dma: support multi-descriptor memcpy for large transfers dmaengine: move fsl-edma dma_[un]map_resource() to linked list library dmaengine: fsl-edma: use local soff/doff variables dmaengine: add vchan_dma_ll_prep_slave_{sg,cyclic} API drivers/dma/Kconfig | 4 + drivers/dma/Makefile | 1 + drivers/dma/fsl-edma-common.c | 448 +++++++++++++----------------------------- drivers/dma/fsl-edma-common.h | 35 +--- drivers/dma/fsl-edma-main.c | 8 +- drivers/dma/ll-dma.c | 353 +++++++++++++++++++++++++++++++++ drivers/dma/mcf-edma-main.c | 6 +- drivers/dma/virt-dma.h | 114 +++++++++-- 8 files changed, 606 insertions(+), 363 deletions(-) --- base-commit: daf496ddce1475078b500e30e0a16de3d8fb9c8a change-id: 20260119-dma_ll_comlib-ba69c554917d Best regards, -- Frank Li