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So chan->device->dev refers to the DMA engine device. chan->dev->device refers to the per-channel device instance. Their similar naming makes the distinction unclear and increases reader confusion. Add union dma_chan::chan_dev to make its purpose explicit and clearly identify it as the per-channel device. After all user switch to chan_dev, union and dma_chan::dev will be removed. Update the kernel-doc accordingly. Besides its sysfs usage, the per-channel device is also used by some DMA engine drivers for IOMMU mapping and therefore deserves a more accurate description. 1st patch use existing helper dma_chan_name() to reduce rename difference. 2nd rename drivers/dma Need following patch to clean other dma engineer driver, which is not in drivers/dma After complete all rename work, dma_chan::dev can be removed. Signed-off-by: Frank Li --- Frank Li (2): dmaengine: use dma_chan_name() helper to get per-channel device name dmaengine: add union chan_dev for dma_chan::dev for clarity drivers/dma/arm-dma350.c | 2 +- drivers/dma/at_hdmac.c | 2 +- drivers/dma/at_xdmac.c | 2 +- drivers/dma/dma-jz4780.c | 10 ++--- drivers/dma/dmaengine.c | 34 ++++++++--------- drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c | 2 +- drivers/dma/dw-axi-dmac/dw-axi-dmac.h | 4 +- drivers/dma/dw/core.c | 2 +- drivers/dma/ep93xx_dma.c | 2 +- drivers/dma/idma64.c | 4 +- drivers/dma/loongson/loongson1-apb-dma.c | 2 +- drivers/dma/loongson/loongson2-apb-cmc-dma.c | 4 +- drivers/dma/loongson/loongson2-apb-dma.c | 4 +- drivers/dma/mmp_pdma.c | 2 +- drivers/dma/nbpfaxi.c | 2 +- drivers/dma/owl-dma.c | 2 +- drivers/dma/pch_dma.c | 2 +- drivers/dma/pxa_dma.c | 52 +++++++++++++------------- drivers/dma/st_fdma.c | 2 +- drivers/dma/stm32/stm32-dma.c | 4 +- drivers/dma/stm32/stm32-dma3.c | 8 ++-- drivers/dma/stm32/stm32-mdma.c | 4 +- drivers/dma/sun6i-dma.c | 2 +- drivers/dma/switchtec_dma.c | 14 +++---- drivers/dma/tegra186-gpc-dma.c | 4 +- drivers/dma/tegra20-apb-dma.c | 2 +- drivers/dma/ti/k3-udma.c | 6 +-- drivers/dma/timb_dma.c | 2 +- include/linux/dmaengine.h | 18 ++++++--- include/trace/events/tegra_apb_dma.h | 6 +-- 30 files changed, 107 insertions(+), 99 deletions(-) --- base-commit: 28d012efb4327f9c75d5e042a7c91e9a542efa98 change-id: 20260812-dma-chan_dev-rename-66263ac5eac9 Best regards, -- Frank Li