[PATCH v2 0/7] dmaengine: Add Peripheral DMA support for SpacemiT K3 SoC

[Troy Mitchell <troy.mitchell@linux.spacemit.com>]

Hi all,

This patch series introduces Peripheral DMA (PDMA) support for the 
SpacemiT K3 SoC, leveraging the existing mmp_pdma driver.

The K3 PDMA IP is largely based on the design found in the previous 
SpacemiT K1 SoC, but introduces a few key architectural differences:
1. It features a variable extended DRCMR base address for DMA request 
   numbers (>= 64) depending on the hardware implementation.
2. Unlike the K1 SoC, where some DMA masters had memory addressing 
   limitations (requiring a dedicated dma-bus), the K3 DMA masters 
   have full memory addressing capabilities.

The series is structured as follows:
- Patch 1-3: Introduce the necessary dt-bindings, including DMA request 
  definitions for both K1 and K3, and the new K3 compatible string.
- Patch 4-5: Refactor the mmp_pdma driver to support variable extended 
  DRCMR bases, and add the specific implementation/ops for the K3 SoC.
- Patch 6: Fixes a critical clock issue where the DDR bus clock 
  (top_dclk) could be gated by CCF, which would cause DMA engines to 
  hang and lead to system instability.
- Patch 7: Finally, instantiates the PDMA controller node in the 
  SpacemiT K3 device tree.

---
Guodong Xu (4):
      dt-bindings: dmaengine: Add SpacemiT K1 DMA request definitions
      dt-bindings: dmaengine: Add SpacemiT K3 DMA compatible string
      dmaengine: mmp_pdma: support variable extended DRCMR base
      dmaengine: mmp_pdma: add Spacemit K3 support

Troy Mitchell (2):
      clk: spacemit: k3: mark top_dclk as CLK_IS_CRITICAL
      riscv: dts: spacemit: Add PDMA controller node for K3 SoC

liyeshan (1):
      dt-bindings: dmaengine: Add SpacemiT K3 DMA request definitions

 .../devicetree/bindings/dma/spacemit,k1-pdma.yaml  |  4 +-
 arch/riscv/boot/dts/spacemit/k3.dtsi               | 11 +++
 drivers/clk/spacemit/ccu-k3.c                      |  2 +-
 drivers/dma/mmp_pdma.c                             | 37 +++++++++-
 include/dt-bindings/dma/k1-pdma.h                  | 56 +++++++++++++++
 include/dt-bindings/dma/k3-pdma.h                  | 83 ++++++++++++++++++++++
 6 files changed, 188 insertions(+), 5 deletions(-)
---
base-commit: 02f90981a67f3b9ee7d6684e7503a4fed7aade0c
change-id: 20260317-k3-pdma-7c1734431436

Best regards,
-- 
Troy Mitchell <troy.mitchell@linux.spacemit.com>