[PATCH 4/6] dt-bindings: input: matrix_keypad - add settle time after enable all columns

[Markus Burri <markus.burri@mt.com>]

Matrix_keypad with high capacity need a longer settle time after enable
all columns.
Add optional property to specify the settle time

Signed-off-by: Markus Burri <markus.burri@mt.com>
Reviewed-by: Manuel Traut <manuel.traut@mt.com>
Tested-by: HeDong Zhao <hedong.zhao@mt.com>
---
 Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
index 570dc10..cf43fa0 100644
--- a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
+++ b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
@@ -24,6 +24,8 @@ Optional Properties:
 - debounce-delay-ms:	debounce interval in milliseconds
 - col-scan-delay-us:	delay, measured in microseconds, that is needed
 			before we can scan keypad after activating column gpio
+- all-cols-on-delay-us:	delay, measured in microseconds, that is needed
+			after activating all column gpios, default is no delay.
 - drive-inactive-cols:	drive inactive columns during scan,
 			default is to turn inactive columns into inputs.
 
-- 
2.39.5