[PATCH v4 0/2] dmaengine: dw-axi-dmac: PM cleanup and reset control support

[Artem Shimko <a.shimko.dev@gmail.com>]

Hello maintainers and reviewers,

This patch series improves the dw-axi-dmac driver in two areas:

Patch 1 simplifies the power management code by using modern kernel
macros and removing redundant wrapper functions, making the code more
maintainable and aligned with current kernel practices.

Patch 2 adds proper reset control support to ensure reliable
initialization and power management, handling resets during probe,
remove, and suspend/resume operations.

For debugging, I used dev_info from the suspend/resume functions.
Before pushing, I removed dev_info from the driver.

Suspend:
echo 0 > /sys/module/printk/parameters/console_suspend
echo mem > /sys/power/state
...
[  195.339311] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_suspend
[  195.350274] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_suspend
[  195.361223] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_suspend
...

Resume:
...
[  200.669945] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_resume
[  200.680975] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_resume
[  200.692108] dw_axi_dmac_platform 100NDA00.NDA-axi-dma: drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c axi_dma_resume
...

Best regards,
Artem Shimko

ChangeLog:
  v1:
    * https://lore.kernel.org/all/20251012100002.2959213-1-a.shimko.dev@gmail.com/T/#t
  v2:
    * https://lore.kernel.org/all/20251013150234.3200627-1-a.shimko.dev@gmail.com/T/#u
  v3:
    * https://lore.kernel.org/all/20251016154627.175796-1-a.shimko.dev@gmail.com/T/#t
  v4:
    * Add error handling for reset_control_deassert() functions
    * Add error log for reset_control_assert() function in suspend

Artem Shimko (2):
  dmaengine: dw-axi-dmac: simplify PM functions and use modern macros
  dmaengine: dw-axi-dmac: add reset control support

 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 81 ++++++++++---------
 drivers/dma/dw-axi-dmac/dw-axi-dmac.h         |  1 +
 2 files changed, 44 insertions(+), 38 deletions(-)

-- 
2.43.0