[PATCH v5 0/4] snvs_pwrkey - code improvements and add report event

[joy.zou@oss.nxp.com]

This patch series improves the snvs_pwrkey driver with better code quality
and add report press event.

The main improvements include:
1. Clean up the code by using local device pointers and dev_err_probe() for
better readability and easier debugging.

2. Fix potential event loss during system suspend by reporting key press events
in the timer callback.

Signed-off-by: Joy Zou <joy.zou@oss.nxp.com>
---
Changes in v5:
- Replace SIMPLE_DEV_PM_OPS with DEFINE_SIMPLE_DEV_PM_OPS and remove
  __maybe_unused from suspend/resume callbacks for patch #4.
- Use pm_ptr() to wrap pm_ops pointer in platform_driver for patch #4.
- Replace suspended flag check in interrupt handler with a pending_press
  latch: set pending_press in hardirq context, consume and report the
  press event from the timer callback in softirq context for patch #4.
- Link to v4: https://patch.msgid.link/20260618-b4-pwrkey-v4-0-4bfda105bdf3@oss.nxp.com

Changes in v4:
- Use dev_err_probe() for devm_input_allocate_device() to simplify error handling
  for patch #1.
- Add Reviewed-by tag for patch #2 and #3.
- Modify the subject description for patch #2.
- Link to v3: https://patch.msgid.link/20260615-b4-pwrkey-v3-0-9510b1173f6e@oss.nxp.com

Changes in v3:
- Add spinlock for pdata->keystate and pdata->suspended per AI review comments.
- Replace hardcode value 1 with local variable keystate in input_report_key()
  under suspended.
- Link to v2: https://lore.kernel.org/r/20260604-pwrkey-cleanup-v2-0-59fa0ddf0d7c@nxp.com

Changes in v2:
- Drop dev_err_probe() change for platform_get_irq() per AI review comments.
- Add new patch #2 replace hardcoding -EINVAL with original error code per
  AI review comments.
- Use dev instead of &pdev->dev for devm_input_allocate_device(), which was
  missed in patch v1 per AI review comments.
- Add a boolean variable suspended and PM callback functions to replace
  the use of the is_suspended field per AI review comments.
- Move event report handle to else branch in suspended state, since the
  pdata->minor_rev == 0 branch has no debounce detection per AI review
  comments.
- Modify patch #3 and #4 commit message.
- Add Reviewed-by tag for patch #1.
- Link to v1: https://lore.kernel.org/r/20260326-pwrkey-cleanup-v1-0-d85d7c0bf275@nxp.com

To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Frank Li <Frank.Li@nxp.com>
To: Bough Chen <haibo.chen@nxp.com>
To: Peng Fan <peng.fan@nxp.com>
To: Jacky Bai <ping.bai@nxp.com>
To: Ye Li <ye.li@nxp.com>
Cc: imx@lists.linux.dev
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org

---
Joy Zou (4):
      Input: snvs_pwrkey - make use of dev_err_probe()
      Input: snvs_pwrkey - propagate error code of platform_get_irq()
      Input: snvs_pwrkey - use local device pointer to simple code
      Input: snvs_pwrkey - add press event reporting to avoid event loss during suspend

 drivers/input/keyboard/snvs_pwrkey.c | 143 ++++++++++++++++++++++++-----------
 1 file changed, 98 insertions(+), 45 deletions(-)
---
base-commit: 34cf6dafc47441dfb6b356a095b89c3585a93714
change-id: 20260615-b4-pwrkey-a60b2043cd29

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