[PATCH v6 0/5] dmaengine: arm-dma350: Add slave support and Sky1 integration

[Jelly Jia <Jelly.Jia@cixtech.com>]

Hello,

This series adds scatter-gather and cyclic slave transfer support to the
Arm DMA-350 driver, then describes the clock, reset and DMA address view
of the CIX Sky1 FCH integration.

Patch 1 fixes the source-trigger bit. Patch 2 adds peripheral transfers
with descriptor-owned resource mappings, coherent linked commands and
hardware-based residue reporting. Patches 3 and 4 describe and handle
integration clocks and resets. Patch 5 describes the FCH DMA address
windows and adds its bus clock.

Sky1 controller nodes use cix,sky1-dma350 with an arm,dma-350 fallback.
The binding requires a bus clock for Sky1 and leaves its reset optional;
both resources remain optional for the generic compatible alone. The
driver uses standard optional resource helpers and introduces no
CIX-specific register programming. The companion AUDSS interrupt-path
series builds on this one and manages the AUDSS interrupt gates in the
CRU driver.

Changes since v5:
- Add the Sky1 compatible with a generic fallback and require clocks for
  Sky1 only. Keep resets optional and update the FCH node. (Frank.)
- Initialize the request to an invalid sentinel and clear request/config
  state when channel resources are freed, but retain it across terminate.
  (Sashiko, followed up by Frank.)
- Keep a failed channel in DMA_ERROR until termination, preventing queued
  work from overwriting the failed cookie's status and residue. Allow
  terminate to clear the error without an active descriptor.
  (Sashiko, followed up by Frank.)
- Add Frank's Reviewed-by to the unchanged clock/reset driver patch.

Previous version:
https://lore.kernel.org/r/20261104124411.296640-1-Jelly.Jia@cixtech.com

Jelly Jia (5):
  dmaengine: arm-dma350: Fix source trigger bit
  dmaengine: arm-dma350: Add slave and cyclic transfer support
  dt-bindings: dma: arm,dma-350: Describe the CIX Sky1 integration
  dmaengine: arm-dma350: Support integration clocks and resets
  arm64: dts: cix: Describe the Sky1 FCH DMA-350 integration

 .../devicetree/bindings/dma/arm,dma-350.yaml  |  30 +-
 arch/arm64/boot/dts/cix/sky1.dtsi             |  36 +-
 drivers/dma/arm-dma350.c                      | 837 +++++++++++++++++-
 3 files changed, 856 insertions(+), 47 deletions(-)


base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
-- 
2.54.0