dma: arm-dma350: handle shared channel IRQ wiring on sky1

[PATCH v6 0/2] dma: arm-dma350: handle shared channel IRQ wiring on sky1
Posted by Jun Guo 1 week, 1 day ago
This series updates DMA-350 support for the SKY1 integration where all DMA
channel interrupt outputs are wired to the same GIC SPI.

Patch 1 enables DMANSECCTRL.INTREN_ANYCHINTR in the driver so per-channel
interrupt status is propagated even when channels share one parent IRQ
line.

Patch 2 adds the SKY1 DMA-350 DT node and describes the channel interrupt
sources using 8 channel entries, while all entries map to the same SPI.

Tested on CIX SKY1 with dmatest:
  % echo 2000 > /sys/module/dmatest/parameters/timeout
  % echo 1 > /sys/module/dmatest/parameters/iterations
  % echo "" > /sys/module/dmatest/parameters/channel
  % echo 1 > /sys/module/dmatest/parameters/run

Changes in v6:
- Drop the dt-binding update and keep the existing 8-channel interrupt
 schema.
- Simplify driver change to a minimal fix:
 enable DMANSECCTRL.INTREN_ANYCHINTR.
- Update SKY1 DT node to describe 8 channel interrupt entries mapped
 to one SPI.

Changes in v5:
- Fix the formatting issue in the AI tag.
- Remove the unnecessary "cix,sky1-dma-350".

Changes in v4:
- Reword binding text to align with kernel style.
- Revise the AI attribution to the standard format.
- Remove redundant links from the commit log.

Changes in v3:
- Rework binding compatible description to match generic-first model.
- Keep interrupts schema support for both 1-IRQ and 8-IRQ topologies.
- Drop SoC match-data dependency for IRQ mode selection.
- Detect IRQ topology via platform_irq_count() in probe path.
- Refactor IRQ handling into a shared channel handler.
- Enable DMANSECCTRL.INTREN_ANYCHINTR only in combined IRQ mode.

Changes in v2:
- Update to kernel standards, enhance patch description, and refactor
 driver to use match data for hardware differentiation instead of
 compatible strings.

Jun Guo (2):
  dma: arm-dma350: enable ANYCH interrupt for shared IRQ wiring
  arm64: dts: cix: add sky1 DMA-350 node with channel IRQ entries

 arch/arm64/boot/dts/cix/sky1.dtsi | 14 ++++++++++++++
 drivers/dma/arm-dma350.c          |  9 +++++++++
 2 files changed, 23 insertions(+)

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2.34.1