[PATCH 2/3] input: rotary-encoder: Introduce new 'steps-per-period' property
From: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Date: 2015-10-09 13:46:55
Also in:
linux-devicetree
Subsystem:
documentation, input (keyboard, mouse, joystick, touchscreen) drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Jonathan Corbet, Dmitry Torokhov, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
This commit deprecates the 'half-period' property and introduces a new property 'steps-per-period'. This property specifies the number of steps (stable states) produced by the rotary encoder for each GPIO period. Such a property is required to accurately describe all kinds of rotary-encoders devices. Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> --- Documentation/devicetree/bindings/input/rotary-encoder.txt | 9 +++++++++ Documentation/input/rotary-encoder.txt | 8 ++++++-- 2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/input/rotary-encoder.txt b/Documentation/devicetree/bindings/input/rotary-encoder.txt
index 331549593ed5..5715ad70d28e 100644
--- a/Documentation/devicetree/bindings/input/rotary-encoder.txt
+++ b/Documentation/devicetree/bindings/input/rotary-encoder.txt@@ -14,7 +14,16 @@ Optional properties: device, hence no steps need to be passed. - rotary-encoder,rollover: Automatic rollove when the rotary value becomes greater than the specified steps or smaller than 0. For absolute axis only. +- rotary-encoder,steps-per-period: Number of steps (stable states) per period. + The values have the following meaning: + 1: Full-period mode (default) + 2: Half-period mode + 4: Quarter-period mode + +Deprecated properties: - rotary-encoder,half-period: Makes the driver work on half-period mode. + This property is deprecated. Instead, a 'steps-per-period ' value should + be used, such as "rotary-encoder,steps-per-period = <2>". See Documentation/input/rotary-encoder.txt for more information.
diff --git a/Documentation/input/rotary-encoder.txt b/Documentation/input/rotary-encoder.txt
index 5737e3590adb..00acf88e4064 100644
--- a/Documentation/input/rotary-encoder.txt
+++ b/Documentation/input/rotary-encoder.txt@@ -9,8 +9,9 @@ peripherals with two wires. The outputs are phase-shifted by 90 degrees and by triggering on falling and rising edges, the turn direction can be determined. -Some encoders have both outputs low in stable states, whereas others also have -a stable state with both outputs high (half-period mode). +Some encoders have both outputs low in stable states, others also have +a stable state with both outputs high (half-period mode) and some have +a stable state in all steps (quarter-period mode). The phase diagram of these two outputs look like this:
@@ -32,6 +33,9 @@ The phase diagram of these two outputs look like this: |<-->| one step (half-period mode) + |<>| + one step (quarter-period mode) + For more information, please see https://en.wikipedia.org/wiki/Rotary_encoder
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2.5.2