[PATCH v7 0/4] add runtime suspend/resume support

[joy.zou@oss.nxp.com]

Clean up driver FLAGs and introduce runtime suspend and resume support for
FSL eDMA.

Signed-off-by: Joy Zou <joy.zou@oss.nxp.com>
---
Changes in V7:
- replace devm_clk_get_optional() with devm_clk_get_optional_enable() for
  patch #1 and #2.
- replace devm_clk_get_optional() with devm_clk_bulk_get_optional_enable()
  for patch #3.
- replace devm_clk_get_optional_enable() with devm_clk_get_optional() for patch #4.
- replace devm_clk_bulk_get_optional_enable() with devm_clk_bulk_get_optional()
  for patch #4.
- use PM_RUNTIME_ACQUIRE_IF_ENABLED()/PM_RUNTIME_ACQUIRE_ERR() guards to
  replace pm_runtime_resume_and_get() and the manual error handling for both
  the eDMA engine and per-channel devices.
- move dmaenginem_async_device_register() after runtime PM is enabled.
- move fsl_edma->drvdata->setup_irq() to the end of probe() and use
  dev_err_probe() on failure.
- check "irq > 0" instead of "irq" before synchronize_irq() in
  fsl_edma_chan_runtime_suspend().
- add fsl_chan txirq and errirq synchronize_irq() check in fsl_edma_chan_runtime_suspend().
- add comments explaining the pm_runtime_get_if_active() checks in the interrupt handlers.
- dropped patch #5 since this is a pre-existing issue that will be fixed in a separate patch.
- Link to v6: https://lore.kernel.org/r/20260701-b4-edma-runtime-opt-v6-0-354ff4229c00@oss.nxp.com

Changes in V6:
- add synchronize_irq() before disabling the channel clock in fsl_edma_chan_runtime_suspend()
  per AI review comments.
- add pm_runtime_get_if_active() in interrupt handlers to ensure registers can be accessed
  correctly per AI review comments.
- remove manual fsl_edma3_detach_pd() call when device_link_add() fails. The devres
  framework will handle cleanup automatically on probe failure per AI review comments.
- clear fsl_chan->pd_dev_link after freeing the device link to prevent potential
  use-after-free issues per AI review comments..
- move fsl_edma->drvdata->setup_irq() atfer edma engine pm_runtime_resume_and_get().
- replace devm_clk_bulk_get_optional_enable() with devm_clk_get_optional()
  and clk_bulk_prepare_enable() in order to use runtime PM for power
  management later.
- replace devm_clk_get_optional_enable() with devm_clk_get_optional()
  and devm_clk_prepare_enable() in order to use runtime PM for power
  management later for patch #1 and #2.
- add new patch #5 fix use-after-free issue per AI review comments.
- modify the commit message for patch #1,#2 and #3.
- add Reviewed-by tag for patch #1,#2 and #3.
- Link to v5: https://lore.kernel.org/r/20260513-b4-b4-edma-runtime-opt-v5-0-1e595bfb8423@nxp.com

Changes in V5:
- add three new patches, two of which replace devm_clk_get_enabled() with devm_clk_get_optional_enabled(),
  and the other convert to clk bulk API.
- remove unnecessary flags FSL_EDMA_DRV_HAS_CHCLK and FSL_EDMA_DRV_HAS_DMACLK.
- remove redundant clk_disable_unprepare() due to the pm_runtime_put_sync_suspend() added.
- use devm_pm_runtime_enable() to replace pm_runtime_enable() and add return value check.
- add return value check for pm_runtime_get_sync().
- replace pm_runtime_get_sync() with pm_runtime_resume_and_get().
- replace DMAMUX clock handling with bulk clock API for edma engine runtime suspend/resume.
- remove dev_pm_domain_detach() when device_link_add() fail because the fsl_edma3_detach_pd()
  also call dev_pm_domain_detach().
- remove device_link_add() DL_FLAG_RPM_ACTIVE flag and pm_runtime_put_sync_suspend().
- add clk_bulk_disable_unprepare() for clk_prepare_enable() fail in fsl_edma_runtime_resume().
- remove the extra space before RUNTIME_PM_OPS.
- add skip channel comments for system suspend.
- add clk_disable_unprepare() for dmaclk at the end of probe function.
- add clk_bulk_disable_unprepare() for muxclk at the end of probe function.
- Link to v4: https://lore.kernel.org/imx/20251017-b4-edma-runtime-v4-1-87c64dd30229@nxp.com/

Changes for V4:
- fix a typo dmaegnine/dmaengine in the subject.
- Link to v3: https://lore.kernel.org/imx/20250912-b4-edma-runtime-v3-1-be22f7161745@nxp.com/

Changes for V3:
- rebased onto commit 8f21d9da4670 ("Add linux-next specific files for 20250911")
  to align with latest changes.
- Remove pm_runtime_dont_use_autosuspend() from fsl_edma3_detach_pd().
  because the autosuspend is not used.
- Move some edma channel registers initialization after the chan_dev
  pm_runtime_enable().
- Add clk_prepare_enable() return check in fsl_edma_runtime_resume.
- Add flag FSL_EDMA_DRV_HAS_DMACLK check in fsl_edma_runtime_resume/suspend().
- Link to v2: https://lore.kernel.org/imx/20241226052643.1951886-1-joy.zou@nxp.com/

Changes for V2:
- drop ret from fsl_edma_chan_runtime_suspend().
- drop ret from fsl_edma_chan_runtime_resume() and return clk_prepare_enable().
- add review tag
- Link to v1: https://lore.kernel.org/imx/20241220021109.2102294-1-joy.zou@nxp.com/

To: Frank Li <Frank.Li@nxp.com>
To: Vinod Koul <vkoul@kernel.org>
To: Joe Hattori <joe@pf.is.s.u-tokyo.ac.jp>
Cc: Frank Li <Frank.Li@kernel.org>
Cc: imx@lists.linux.dev
Cc: dmaengine@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

---
Joy Zou (4):
      dmaengine: fsl-edma: use devm_clk_get_optional_enabled() for channel clock
      dmaengine: fsl-edma: use devm_clk_get_optional() for DMA engine clock
      dmaengine: fsl-edma: convert DMAMUX clock handling to bulk clock API
      dmaengine: fsl-edma: add runtime suspend/resume support

 drivers/dma/fsl-edma-common.c |  14 +-
 drivers/dma/fsl-edma-common.h |   4 +-
 drivers/dma/fsl-edma-main.c   | 330 ++++++++++++++++++++++++++++++++----------
 3 files changed, 261 insertions(+), 87 deletions(-)
---
base-commit: 3d229ce89862b8e82d71a9e11d6f840ca272a6d6
change-id: 20260811-b4-edma-runtime-opt-mo-0d19aeeb5dbe

Best regards,
--  
Joy Zou <joy.zou@oss.nxp.com>