[PATCH v3 0/2] Add a property to turn off the max touch controller in suspend mode

[PATCH v3 0/2] Add a property to turn off the max touch controller in suspend mode

[Stefan Eichenberger]

Our hardware has a shared regulator that powers various peripherals such
as the display, touch, USB hub, etc. Since the Maxtouch controller
doesn't currently allow it to be turned off, this regulator has to stay
on in suspend mode. This increases the overall power consumption. In
order to turn off the controller when the system goes into suspend mode,
this series adds a device tree property to the maxtouch driver that
allows the controller to be turned off completely and ensurs that it can
resume from the power off state.

Changes since v2:
- Add Reviewed-by tags from Linus and Krzysztof to the dt-bindings patch

Changes since v1:
- Rename the property and change the description (Krzysztof, Linus,
Dmitry, Conor)

Stefan Eichenberger (2):
  dt-bindings: input: atmel,maxtouch: add poweroff-sleep property
  Input: atmel_mxt_ts - support poweroff in suspend

 .../bindings/input/atmel,maxtouch.yaml        |  6 ++
 drivers/input/touchscreen/atmel_mxt_ts.c      | 72 ++++++++++++++-----
 2 files changed, 61 insertions(+), 17 deletions(-)

-- 
2.40.1

[PATCH v3 1/2] dt-bindings: input: atmel,maxtouch: add poweroff-sleep property

[Stefan Eichenberger]

From: Stefan Eichenberger <stefan.eichenberger@toradex.com>

Add a new property to indicate that the device should power off rather
than use deep sleep. Deep sleep is a feature of the controller that
expects the controller to remain powered in suspend. However, if a
display shares its regulator with the touch controller, we may want to
do a power off so that the display and touch controller do not use any
power.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 Documentation/devicetree/bindings/input/atmel,maxtouch.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml b/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml
index c40799355ed7..8de5f539b30e 100644
--- a/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml
+++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.yaml
@@ -87,6 +87,12 @@ properties:
       - 2 # ATMEL_MXT_WAKEUP_GPIO
     default: 0
 
+  atmel,poweroff-sleep:
+    description: |
+      Instead of using the deep sleep feature of the maXTouch controller,
+      poweroff the regulators.
+    type: boolean
+
   wakeup-source:
     type: boolean
 
-- 
2.40.1