[PATCH v4 0/2] Input: st1232 - add system wakeup support

[phucduc . bui]

From: bui duc phuc <phucduc.bui@xxxxxxxxx>

This patch series adds support for using the Sitronix ST1232
touchscreen as a wakeup source on the Armadillo800EVA board.

Patch 1 documents the generic wakeup-source property in the
Devicetree binding for the ST1232 touchscreen controller.

Patch 2 enables the wakeup-source property in the ST1232
touchscreen node for the Armadillo800EVA board, allowing touch
events to wake the system from suspend.

Verified functionality

* The "power/wakeup" sysfs attribute is present for the device.
* The system resumes correctly from 'mem' and 'freeze' states when the
  touchscreen is touched.

Additional test information

Demo video showing wakeup from suspend:
https://youtu.be/POJhbguiA7A

Kernel config and boot logs:
https://gist.github.com/BuiDucPhuc/ac7d5d732658ca293af4323ad04accca

Changes in v4:
*Drop patch 3 as the I2C core already performs the initialization, 
 registration, and management of the wakeup interrupt, making the 
 implementation in the driver redundant.
 The original intention of patch 3 was to expose active_count, 
 event_count, and wakeup_count to user space. However, this is not 
 necessary since the R8A7740 SoC has some specific characteristics 
 in its wakeup interrupt handling.
 Moreover, modifying this driver could potentially affect other SoCs 
 sharing the same driver, so the patch is removed.
*Going back to v1 design.
*Update the cover letter

Changes in v3:
* Patch 3: Removed debug dev_info() log messages for a cleaner
  production-ready implementation.
* No changes to Patch 1 and Patch 2.
* Link : 
  https://lore.kernel.org/all/20260306111912.58388-1-phucduc.bui@xxxxxxxxx/
  

Changes in v2
* Drop description for wakeup-source property as suggested by
  Krzysztof Kozlowski.
* Updated commit messages for clarity.
* Added driver-side wakeup handling in st1232.c.
* Link : 
  https://lore.kernel.org/all/20260306104025.43970-1-phucduc.bui@xxxxxxxxx/

v1 
 *Link: 
  https://lore.kernel.org/all/20260305113512.227269-1-phucduc.bui@xxxxxxxxx/

This series depends on the following patch which has been
submitted but not yet merged:

drm: shmobile: Fix blank screen after resume when LCDC is stopped
Link: https://lore.kernel.org/all/20260226054035.30330-1-phucduc.bui@xxxxxxxxx/



bui duc phuc (2):
  dt-bindings: input: touchscreen: sitronix,st1232: Add wakeup-source
  arm: dts: renesas: r8a7740-armadillo800eva: Add wakeup-source to
    st1232

 .../bindings/input/touchscreen/sitronix,st1232.yaml           | 4 ++++
 arch/arm/boot/dts/renesas/r8a7740-armadillo800eva.dts         | 1 +
 2 files changed, 5 insertions(+)

-- 
2.43.0