[PATCH v10 0/2] Add support for Loongson1 APB DMA

[Keguang Zhang via B4 Relay]

Add the driver and dt-binding document for Loongson1 APB DMA.

---
Changes in v10:
- Implement the hwdescs by link list to eliminate the limitation of the desc number.
- Add the prefix 'LS1X_' for all registers and their bits.
- Drop the macros: chan_readl() and chan_writel().
- Use %pad for printing a dma_addr_t type.
- Some minor fixes.
- Link to v9: https://lore.kernel.org/r/20240613-loongson1-dma-v9-0-6181f2c7dece@xxxxxxxxx

Changes in v9:
- Fix all the errors and warnings when building with W=1 and C=1
- Link to v8: https://lore.kernel.org/r/20240607-loongson1-dma-v8-0-f9992d257250@xxxxxxxxx

Changes in v8:
- Change 'interrupts' property to an items list
- Link to v7: https://lore.kernel.org/r/20240329-loongson1-dma-v7-0-37db58608de5@xxxxxxxxx

Changes in v7:
- Change the comptible to 'loongson,ls1*-apbdma' (suggested by Huacai Chen)
- Update the title and description part accordingly
- Rename the file to loongson,ls1b-apbdma.yaml
- Add a compatible string for LS1A
- Delete minItems of 'interrupts'
- Change patterns of 'interrupt-names' to const
- Rename the file to loongson1-apb-dma.c to keep the consistency
- Update Kconfig and Makefile accordingly
- Link to v6: https://lore.kernel.org/r/20240316-loongson1-dma-v6-0-90de2c3cc928@xxxxxxxxx

Changes in v6:
- Change the compatible to the fallback
- Implement .device_prep_dma_cyclic for Loongson1 sound driver,
  as well as .device_pause and .device_resume.
- Set the limitation LS1X_DMA_MAX_DESC and put all descriptors
  into one page to save memory
- Move dma_pool_zalloc() into ls1x_dma_alloc_desc()
- Drop dma_slave_config structure
- Use .remove_new instead of .remove
- Use KBUILD_MODNAME for the driver name
- Improve the debug information
- Some minor fixes

Changes in v5:
- Add the dt-binding document
- Add DT support
- Use DT information instead of platform data
- Use chan_id of struct dma_chan instead of own id
- Use of_dma_xlate_by_chan_id() instead of ls1x_dma_filter()
- Update the author information to my official name

Changes in v4:
- Use dma_slave_map to find the proper channel.
- Explicitly call devm_request_irq() and tasklet_kill().
- Fix namespace issue.
- Some minor fixes and cleanups.

Changes in v3:
- Rename ls1x_dma_filter_fn to ls1x_dma_filter.

Changes in v2:
- Change the config from 'DMA_LOONGSON1' to 'LOONGSON1_DMA',
- and rearrange it in alphabetical order in Kconfig and Makefile.
- Fix comment style.

---
Keguang Zhang (2):
      dt-bindings: dma: Add Loongson-1 APB DMA
      dmaengine: Loongson1: Add Loongson-1 APB DMA driver

 .../bindings/dma/loongson,ls1b-apbdma.yaml         |  67 ++
 drivers/dma/Kconfig                                |   9 +
 drivers/dma/Makefile                               |   1 +
 drivers/dma/loongson1-apb-dma.c                    | 675 +++++++++++++++++++++
 4 files changed, 752 insertions(+)
---
base-commit: 668d33c9ff922c4590c58754ab064aaf53c387dd
change-id: 20231120-loongson1-dma-163afe5708b9

Best regards,
-- 
Keguang Zhang <keguang.zhang@xxxxxxxxx>