[PATCH v5 00/18] dmaengine: ti: Add support for BCDMA v2 and PKTDMA v2

[Sai Sree Kartheek Adivi]

This series adds support for the BCDMA_V2 and PKTDMA_V2 which is
introduced in AM62L.

The key differences between the existing DMA and DMA V2 are:
- Absence of TISCI: Instead of configuring via TISCI calls, direct
  register writes are required.
- Autopair: There is no longer a need for PSIL pair and instead AUTOPAIR
  bit needs to set in the RT_CTL register.
- Static channel mapping: Each channel is mapped to a single peripheral.
- Direct IRQs: There is no INT-A and interrupt lines from DMA are
  directly connected to GIC.
- Remote side configuration handled by DMA. So no need to write to PEER
  registers to START / STOP / PAUSE / TEARDOWN.
- Unified Channel Space: Tx and Rx channels share a single register
  space. Each channel index is specifically fixed in hardware as either
  Tx or Rx in an interleaved manner.

Changes from v4 to v5:
- Introduce a new version variable in udma_match_data to differentiate
  between K3 UDMA V1 and K3 UDMA V2. This simplifies the approach for
  adding any future possible variants avoiding complex if conditions.
- Fix both K3 BCDMA V2 and PKTDMA V2 dt bindings as per the comments
  from previous versions.
- Fix minor nitpicks like following the reverse christmas tree order for
  variable declarations.
- Remove the patch [v4 19/19] that switches to synchronous descriptor
  freeing. With this patch, dma_free_coherent gets called in irq
  context and hence a WARN().
link to v4:
https://lore.kernel.org/all/20260130110159.359501-1-s-adivi@xxxxxx/

Changes from v3 to v4:
- Rename the dt-binding files to add "ti," prefix.
- Update cell description in dt-bindings and add client examples.
- Update k3_ring_intr_regs reg names
- Rename soc specific data to bcdma_v2_data and pktdma_v2_data to
  bcdma_v2_am62l_data and pktdma_v2_am62l_data.
- Add a new patch [18/19] to fix a null pointer dereference issue when
  trying to reserve a channel id that is out of bounds in
  udma_reserve_##res macro. Also fix logging issues in this macro.
- Add a new patch [19/19] to switch to synchronous descriptor freeing to
  avoid running out of memory during stress tests.
- Fix checkpatch warnings.
link to v3:
https://lore.kernel.org/linux-arm-kernel/20250623053716.1493974-1-s-adivi@xxxxxx

Changes from v2 to v3:
- Fix checkpatch errors & spellings.
link to v2:
https://lore.kernel.org/linux-arm-kernel/20250612071521.3116831-1-s-adivi@xxxxxx

Changes from v1 to v2:
- Split refactoring of k3-udma driver into multiple commits
- Fix bcdma v2 and pktdma v2 dt-binding examples
- Fix compatibles in k3-udma-v2.c
- move udma_is_desc_really_done to k3-udma-common.c as the difference
  between k3-udma and k3-udma-v2 implementation is minor.
- remove udma_ prefix to function pointers in udma_dev
- reorder the commits to first refactor the existing code completely and
  then introduce k3-udma-v2 related commits.
- remove redundant includes in k3-udma-common.c
- remove ti_sci_ dependency for k3_ringacc in Kconfig
- refactor setup_resources functions to remove ti_sci_ code from common
  logic.
link to v1:
https://lore.kernel.org/linux-arm-kernel/20250428072032.946008-1-s-adivi@xxxxxx

Sai Sree Kartheek Adivi (18):
  dmaengine: ti: k3-udma: move macros to header file
  dmaengine: ti: k3-udma: move structs and enums to header file
  dmaengine: ti: k3-udma: move static inline helper functions to header
    file
  dmaengine: ti: k3-udma: move descriptor management to k3-udma-common.c
  dmaengine: ti: k3-udma: move ring management functions to
    k3-udma-common.c
  dmaengine: ti: k3-udma: Add variant-specific function pointers to
    udma_dev
  dmaengine: ti: k3-udma: move udma utility functions to
    k3-udma-common.c
  dmaengine: ti: k3-udma: move resource management functions to
    k3-udma-common.c
  dmaengine: ti: k3-udma: refactor resource setup functions
  dmaengine: ti: k3-udma: move inclusion of k3-udma-private.c to
    k3-udma-common.c
  drivers: soc: ti: k3-ringacc: handle absence of tisci
  dt-bindings: dma: ti: Add K3 BCDMA V2
  dt-bindings: dma: ti: Add K3 PKTDMA V2
  dmaengine: ti: k3-psil-am62l: Add AM62Lx PSIL and PDMA data
  dmaengine: ti: k3-udma-v2: New driver for K3 BCDMA_V2
  dmaengine: ti: k3-udma-v2: Add support for PKTDMA V2
  dmaengine: ti: k3-udma-v2: Update glue layer to support PKTDMA V2
  dmaengine: ti: k3-udma: Validate resource ID and fix logging in
    reservation

 .../bindings/dma/ti/ti,am62l-dmss-bcdma.yaml  |  120 +
 .../bindings/dma/ti/ti,am62l-dmss-pktdma.yaml |  100 +
 drivers/dma/ti/Kconfig                        |   21 +-
 drivers/dma/ti/Makefile                       |    5 +-
 drivers/dma/ti/k3-psil-am62l.c                |  132 +
 drivers/dma/ti/k3-psil-priv.h                 |    1 +
 drivers/dma/ti/k3-psil.c                      |    1 +
 drivers/dma/ti/k3-udma-common.c               | 2610 ++++++++++++++
 drivers/dma/ti/k3-udma-glue.c                 |   91 +-
 drivers/dma/ti/k3-udma-private.c              |   45 +-
 drivers/dma/ti/k3-udma-v2.c                   | 1475 ++++++++
 drivers/dma/ti/k3-udma.c                      | 3102 +----------------
 drivers/dma/ti/k3-udma.h                      |  590 ++++
 drivers/soc/ti/k3-ringacc.c                   |  188 +-
 include/linux/soc/ti/k3-ringacc.h             |   20 +
 15 files changed, 5466 insertions(+), 3035 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/dma/ti/ti,am62l-dmss-bcdma.yaml
 create mode 100644 Documentation/devicetree/bindings/dma/ti/ti,am62l-dmss-pktdma.yaml
 create mode 100644 drivers/dma/ti/k3-psil-am62l.c
 create mode 100644 drivers/dma/ti/k3-udma-common.c
 create mode 100644 drivers/dma/ti/k3-udma-v2.c


base-commit: 635c467cc14ebdffab3f77610217c1dacaf88e8c
-- 
2.34.1