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

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Message-ID: <20250611125723.181711-1-guodong@riscstar.com>
Date: Wed, 11 Jun 2025 20:57:15 +0800
From: Guodong Xu <guodong@...cstar.com>
To: vkoul@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	dlan@...too.org,
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Cc: guodong@...cstar.com,
	elder@...cstar.com,
	dmaengine@...r.kernel.org,
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Subject: [PATCH 0/8] dma: mmp_pdma: Add SpacemiT K1 SoC support with 64-bit addressing

This series extends the existing MMP PDMA driver to support SpacemiT PDMA
controllers with 64-bit addressing capabilities, as used in the K1 SoC.

The SpacemiT K1 SoC contains a PDMA controller that is largely compatible
with the existing Marvell MMP PDMA, but adds support for 64-bit physical
addressing through Long Physical Address Extension (LPAE) mode. This
requires programming additional high address registers (DDADRH, DSADRH,
DTADRH) and enabling the DCSR_LPAEEN control bit.

The implementation maintains full backward compatibility with existing
32-bit Marvell platforms while adding the necessary infrastructure for
64-bit address handling through a flexible configuration-based approach.

Key features added:
- 64-bit DMA address support via LPAE mode
- Platform-specific operation abstractions (mmp_pdma_ops)
- Optional clock and reset controller support for modern SoCs
- Device tree integration for SpacemiT K1 SoC and Banana Pi F3 board

Testing:
This patchset has been tested on SpacemiT K1-based Banana Pi F3 hardware
to ensure the PDMA controller operates correctly with 64-bit addressing.
Existing functionality on 32-bit platforms remains unchanged.

This patchset is based on [spacemit/for-next]
  base: https://github.com/spacemit-com/linux for-next
Plus the reset controller driver, posted by Alex Elder (v10):
https://lore.kernel.org/all/20250513215345.3631593-1-elder@riscstar.com/

Guodong Xu (8):
  dt-bindings: dma: marvell,mmp-dma: Add SpacemiT PDMA compatibility
  dma: mmp_pdma: Add optional clock support
  dma: mmp_pdma: Add optional reset controller support
  dma: mmp_pdma: Add SpacemiT PDMA support with 64-bit addressing
  riscv: dts: spacemit: Add dma bus and PDMA node for K1 SoC
  riscv: dts: spacemit: Enable PDMA0 controller on Banana Pi F3
  dma: Kconfig: MMP_PDMA: Add support for ARCH_SPACEMIT
  riscv: defconfig: Enable MMP_PDMA support for SpacemiT K1 SoC

 .../bindings/dma/marvell,mmp-dma.yaml         |  17 ++
 .../boot/dts/spacemit/k1-bananapi-f3.dts      |   4 +
 arch/riscv/boot/dts/spacemit/k1.dtsi          | 234 ++++++++--------
 arch/riscv/configs/defconfig                  |   3 +-
 drivers/dma/Kconfig                           |   2 +-
 drivers/dma/mmp_pdma.c                        | 249 +++++++++++++++---
 6 files changed, 370 insertions(+), 139 deletions(-)

-- 
2.43.0