[PATCH V3 0/6] dmaengine: zynqmp_dma: Per-channel reset, IRQ guard improvements, and PM fixes

[Golla Nagendra <nagendra.golla@amd.com>]

This series extends the ZynqMP DMA driver with per-channel reset support
for Versal Gen2 and Versal Net, improves the runtime PM guard in the IRQ
handler, and fixes a PM usage count leak in the probe error path.

Patch 1 fixes a PM usage count leak in the probe error path where
pm_runtime_resume_and_get() succeeds but a later step (e.g., channel
probe) fails, leaving the usage count incremented and clocks enabled.

Patch 2 adds a PM_RUNTIME_ACQUIRE_IF_ACTIVE() guard macro to pm_runtime.h
so drivers can conditionally acquire a runtime PM reference only when the
device is already active, with automatic release on scope exit.

Patch 3 uses PM_RUNTIME_ACQUIRE_IF_ACTIVE() in zynqmp_dma_irq_handler()
to safely guard against spurious interrupts arriving while the device is
runtime-suspended. When runtime PM is disabled (probe fallback path) the
handler falls through to normal processing unchanged.

Patch 4 updates the dt-binding to add the amd,versal-net-dma-1.0
compatible string and restricts the resets property per-compatible using
allOf:if:then:, making it required for Versal Gen2 and Versal Net and
explicitly absent for all other platforms.

Patch 5 adds the amd,versal-net-dma-1.0 entry to the driver match table
with a dedicated versal_net_dma_config carrying has_reset=true.

Patch 6 adds reset control handling in the channel probe path, using the
has_reset field in zynqmp_dma_config to conditionally call device_reset()
on Versal Gen2 and Versal Net channels.

Changes in V3:
- Patch 1: New patch - split PM usage count fix into a separate patch as
- Patch 2: New patch - add PM_RUNTIME_ACQUIRE_IF_ACTIVE() guard and its
  backing infrastructure to pm_runtime.h 
- Patch 3: Use PM_RUNTIME_ACQUIRE_IF_ACTIVE() guard instead of the manual
  pm_runtime_get_if_active()/pm_runtime_put() pair from V2
- Patch 4: Use allOf:if:then: to restrict the resets property per-
  compatible with resets: false for non-matching platforms 
  also expand to include amd,versal-net-dma-1.0
- Patch 5: New patch - add amd,versal-net-dma-1.0 compatible to driver
- Patch 6: Introduce has_reset flag in zynqmp_dma_config to gate the
  reset path; PM usage count fix split into patch 1/6

Golla Nagendra (5):
  dmaengine: zynqmp_dma: Fix PM usage count handling in probe error path
  PM: runtime: Add pm_runtime_if_active guard and conditional variant
  dmaengine: zynqmp_dma: Guard IRQ handler against spurious interrupts
  dmaengine: zynqmp_dma: Add new compatible string for Versal Net
  dmaengine: zynqmp_dma: Add per-channel reset support

Jay Buddhabhatti (1):
  dt-bindings: dma: xlnx,zynqmp-dma: Add Versal Net compatible support

 .../dma/xilinx/xlnx,zynqmp-dma-1.0.yaml       | 25 ++++++++++++++++---
 drivers/dma/xilinx/zynqmp_dma.c               | 25 ++++++++++++++++++-
 include/linux/pm_runtime.h                    | 12 +++++++++
 3 files changed, 58 insertions(+), 4 deletions(-)

-- 
2.43.7