[PATCH v6 0/2] Add `devm_dma_request_chan()` to simplify probe path in atmel-quadspi.c

[Bence Csókás]

The probe function of the atmel-quadspi driver got quite convoluted,
especially since the addition of SAMA7G5 support, that was forward-ported
from an older vendor kernel. To alleivate this - and similar problems in
the future - an effort was made to migrate as many functions as possible,
to their devm_ managed counterparts. Patch 1/2 adds the new
`devm_dma_request_chan()` function. Patch 2/2 then uses this APIs to
simplify the probe() function.

Change in v4:
* split PM imbalance fix (now merged) and DMA cleanup (this series)
Change in v6:
* rebase to spi/for-next, see note below:

There is currently no difference in drivers/dma/dmaengine.c between it and
dma/next [1], therefore PATCH 1/2 should be safe for Vinod to apply. But
this way PATCH 2/2 is trivial to apply. I didn't want to pull the whole
linux-next tree, but if any ofyou run into problems, let me know, and I'll
rebase the series on it instead.

[1]
commit 3c018bf5a0ee ("dmaengine: idxd: Remove unused pointer and macro")

Links to previous versions:
pre-series:
https://lore.kernel.org/linux-kernel/20241222141427.819222-1-csokas.bence@prolan.hu/
https://lore.kernel.org/linux-kernel/20250114222851.1023194-1-csokas.bence@prolan.hu/
v1:
https://lore.kernel.org/linux-kernel/20250115160244.1102881-1-csokas.bence@prolan.hu/
v2:
https://lore.kernel.org/linux-kernel/20250124085221.766303-8-csokas.bence@prolan.hu/
v3:
https://lore.kernel.org/linux-kernel/20250207124802.165408-1-csokas.bence@prolan.hu/
v4:
https://lore.kernel.org/lkml/20250317135340.382532-1-csokas.bence@prolan.hu/
v5:
https://lore.kernel.org/lkml/20250505184936.312274-1-csokas.bence@prolan.hu

Bence Csókás (2):
  dma: Add devm_dma_request_chan()
  spi: atmel-quadspi: Use `devm_dma_request_chan()`

 drivers/dma/dmaengine.c     | 30 +++++++++++++++++++++++
 drivers/spi/atmel-quadspi.c | 48 ++++++++++---------------------------
 include/linux/dmaengine.h   |  7 ++++++
 3 files changed, 50 insertions(+), 35 deletions(-)


base-commit: 6155cbfffd294bb267f053ec596ced41bcdb0986
-- 
2.43.0