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

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Message-Id: <20241031063004.69956-5-markus.burri@mt.com>
Date: Thu, 31 Oct 2024 07:30:02 +0100
From: Markus Burri <markus.burri@...com>
To: linux-kernel@...r.kernel.org
Cc: Markus Burri <markus.burri@...com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-input@...r.kernel.org,
	devicetree@...r.kernel.org,
	Manuel Traut <manuel.traut@...com>,
	HeDong Zhao <hedong.zhao@...com>
Subject: [PATCH 4/6] dt-bindings: input: matrix_keypad - add settle time after enable all columns

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@...com>
Reviewed-by: Manuel Traut <manuel.traut@...com>
Tested-by: HeDong Zhao <hedong.zhao@...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