linux-kernel - [PATCH v5 0/8] dmaengine: mmp_pdma: Add SpacemiT K1 SoC support with 64-bit addressing

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Message-Id: <20250822-working_dma_0701_v2-v5-0-f5c0eda734cc@riscstar.com>
Date: Fri, 22 Aug 2025 11:06:26 +0800
From: Guodong Xu <guodong@...cstar.com>
To: Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>, duje@...emihanovic.xyz
Cc: Alex Elder <elder@...cstar.com>, Vivian Wang <wangruikang@...as.ac.cn>, 
 dmaengine@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 spacemit@...ts.linux.dev, Guodong Xu <guodong@...cstar.com>, 
 Troy Mitchell <troy.mitchell@...ux.spacemit.com>, 
 Dan Carpenter <dan.carpenter@...aro.org>
Subject: [PATCH v5 0/8] dmaengine: mmp_pdma: Add SpacemiT K1 SoC support
 with 64-bit addressing

This patchset adds support for SpacemiT K1 PDMA controller to the existing
mmp_pdma driver. The K1 PDMA controller is compatible with Marvell MMP PDMA
but extends it with 64-bit addressing capabilities through LPAE (Long
Physical Address Extension) bit and higher 32-bit address registers (DDADRH,
DSADRH and DTADRH).

In v5, two smatch warnings reported by kernel test bot and Dan Carpenter were
fixed.

The patchset has been tested on BananaPi F3 board.

This patchset is based on v6.17-rc2, with patch 8 (defconfig) depending on:
 - riscv: defconfig: run savedefconfig to reorder it
Link: https://lore.kernel.org/all/20250611-01-riscv-defconfig-v1-1-b48fc3517498@gentoo.org/

All of these patches are available here:
https://github.com/docularxu/linux/tree/working_dma_0819

Changes in v5:
- Rebased to v6.17-rc2.
- Two variable dereference issues are fixed in patch 4.

Link to v4:
https://lore.kernel.org/r/20250815-working_dma_0701_v2-v4-0-62145ab6ea30@riscstar.com

Changes in v4:
- Rebased to v6.17-rc1.
- Updated commit messages in patch 2 and 3.
- Renamed the node from pdma0 to pdma.
- Put "interrupts" after "clocks" and "resets"

Link to v3:
https://lore.kernel.org/r/20250714-working_dma_0701_v2-v3-0-8b0f5cd71595@riscstar.com

Changes in v3:
- Created separated yaml binding for Spacemit K1 PDMA controller
- Updated pdma0 node properties according to the new yaml binding
- Put pdma0 node in k1.dtsi according to its device address
- Put pdma0 node in board dts files according to alphabetic order

Link to v2:
https://lore.kernel.org/r/20250701-working_dma_0701_v2-v2-0-ab6ee9171d26@riscstar.com

Changes in v2:
- Tag the series as "damengine".
- Used more specific compatible string "spacemit,k1-pdma"
- Enhanced DT bindings with conditional constraints:
   - clocks/resets properties only required for SpacemiT K1
   - #dma-cells set to 2 for marvell,pdma-1.0 and spacemit,k1-pdma
   - #dma-cells set to 1 for other variants
- Split mmp_pdma driver changes per maintainer feedback:
   - First patch (4/8) adds ops abstraction layer and 32-bit support
   - Second patch (5/8) adds K1-specific 64-bit support
- Merged Kconfig changes into the dmaengine: mmp_pdma driver patch (5/8)
- Enabled pdma0 on both BPI-F3 and Milk-V Jupiter

Link to v1:
https://lore.kernel.org/all/20250611125723.181711-1-guodong@riscstar.com/

Signed-off-by: Guodong Xu <guodong@...cstar.com>
Tested-by: Troy Mitchell <troy.mitchell@...ux.spacemit.com>
---
Guodong Xu (8):
      dt-bindings: dma: Add SpacemiT K1 PDMA controller
      dmaengine: mmp_pdma: Add clock support
      dmaengine: mmp_pdma: Add reset controller support
      dmaengine: mmp_pdma: Add operations structure for controller abstraction
      dmaengine: mmp_pdma: Add SpacemiT K1 PDMA support with 64-bit addressing
      riscv: dts: spacemit: Add PDMA node for K1 SoC
      riscv: dts: spacemit: Enable PDMA on Banana Pi F3 and Milkv Jupiter
      riscv: defconfig: Enable MMP_PDMA support for SpacemiT K1 SoC

 .../devicetree/bindings/dma/spacemit,k1-pdma.yaml  |  68 +++++
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts    |   4 +
 arch/riscv/boot/dts/spacemit/k1-milkv-jupiter.dts  |   4 +
 arch/riscv/boot/dts/spacemit/k1.dtsi               |  11 +
 arch/riscv/configs/defconfig                       |   1 +
 drivers/dma/Kconfig                                |   2 +-
 drivers/dma/mmp_pdma.c                             | 289 ++++++++++++++++++---
 7 files changed, 343 insertions(+), 36 deletions(-)
---
base-commit: f3c5631f70e434e318c44001e2417d4770f06cd0
change-id: 20250701-working_dma_0701_v2-7d2cf506aad7
prerequisite-change-id: 20250611-01-riscv-defconfig-7f90f73d283d:v1
prerequisite-patch-id: 53bda77e089023a09152a7d5403e1a738355c5d3

Best regards,
-- 
Guodong Xu <guodong@...cstar.com>