From: bui duc phuc <phucduc.bui@gmail.com>

Hi all,

This patch series adds system wakeup support for the ST1232 touchscreen
controller.

During development it was observed that the device did not expose the
"power/wakeup" sysfs attribute, preventing it from being configured as
a wakeup source for system suspend.

To address this, the Devicetree node for the touchscreen is updated to
include the "wakeup-source" property, and the st1232 driver is extended
to initialize the device wakeup capability and report wakeup events
to the PM core.

Testing

The changes were tested on the
Armadillo800EVA board based on the Renesas R8A7740 SoC.

The system successfully resumes from suspend when the LCD panel is
touched.

Due to the interrupt hierarchy on this platform, the parent interrupt
controller (GIC, IRQ 24) is recorded as the primary source that wakes
the SoC, followed by the device interrupt (IRQ 35).

Example kernel log during wakeup:

PM: suspend-to-idle
PM: Triggering wakeup from IRQ 24
PM: Triggering wakeup from IRQ 35

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.

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.

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.

Patch series

1. dt-bindings: input: touchscreen: st1232: document wakeup-source
2. arm: dts: r8a7740: armadillo800eva: add wakeup-source to st1232
3. Input: st1232: add wakeup support

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@gmail.com/

Feedback and review are welcome.


bui duc phuc (3):
  dt-bindings: input: touchscreen: sitronix,st1232: Add wakeup-source
  arm: dts: renesas: r8a7740-armadillo800eva: Add wakeup-source to
    st1232
  input: touchscreen: st1232: add system wakeup support

 .../input/touchscreen/sitronix,st1232.yaml    |  4 ++++
 .../dts/renesas/r8a7740-armadillo800eva.dts   |  1 +
 drivers/input/touchscreen/st1232.c            | 22 ++++++++++++++-----
 3 files changed, 21 insertions(+), 6 deletions(-)

-- 
2.43.0

Krzysztof already adviced you to not attach new series to old threads.
Please follow this suggestion:

Do not attach (thread) your patchsets to some other threads (unrelated
or older versions). This buries them deep in the mailbox and might
interfere with applying entire sets. See also:
https://elixir.bootlin.com/linux/v6.16-rc2/source/Documentation/process/submitting-patches.rst#L830

Hi Wolfram,

> Krzysztof already adviced you to not attach new series to old threads.
> Please follow this suggestion:
> 
> Do not attach (thread) your patchsets to some other threads (unrelated
> or older versions). This buries them deep in the mailbox and might
> interfere with applying entire sets. See also:
> 
> https://elixir.bootlin.com/linux/v6.16-rc2/source/Documentation/process/submitting-patches.rst#L830
>

You are right, and I apologize for the duplication of the mistake.

I missed Krzysztof's earlier reply while I was preparing v3, which led to 
this incorrect threading again. I have already replied to Krzysztof's 
thread to acknowledge the error.

I will follow the proper process by starting a fresh, un-threaded series 
for v4.

Thank you for the reminder.

Best regards,
Phuc