[PATCH v2 0/3] Input: st1232 - add system wakeup support

phucduc.bui
2026-03-06T10:40:59Z

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 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

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 | 27 +++++++++++++++----
3 files changed, 27 insertions(+), 5 deletions(-)

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2.43.0