target/linux/brcm2708/patches-4.14/950-0158-add-additional-overrides-to-rotary-encoder-overlay-2.patch

   1 From 8cf805e57fa5cf4c872883968def037cd7c903cc Mon Sep 17 00:00:00 2001
   2 From: Aaron Shaw <shawaj@gmail.com>
   3 Date: Fri, 5 Jan 2018 15:08:37 +0000
   4 Subject: [PATCH 158/454] add additional overrides to rotary-encoder overlay
   5  (#2334)
   6
   7 ---
   8  arch/arm/boot/dts/overlays/README             | 23 +++++++++++++++++++
   9  .../dts/overlays/rotary-encoder-overlay.dts   | 18 +++++++++++----
  10  2 files changed, 36 insertions(+), 5 deletions(-)
  11
  12 --- a/arch/arm/boot/dts/overlays/README
  13 +++ b/arch/arm/boot/dts/overlays/README
  14 @@ -1331,6 +1331,29 @@ Params: rotary0_pin_a           GPIO con
  15                                  (default 4).
  16          rotary0_pin_b           GPIO connected to rotary encoder channel B
  17                                  (default 17).
  18 +        relative_axis           register a relative axis rather than an
  19 +                                absolute one. Relative axis will only
  20 +                                generate +1/-1 events on the input device,
  21 +                                hence no steps need to be passed.
  22 +        linux_axis              the input subsystem axis to map to this
  23 +                                rotary encoder. Defaults to 0 (ABS_X / REL_X)
  24 +        rollover                Automatic rollover when the rotary value
  25 +                                becomes greater than the specified steps or
  26 +                                smaller than 0. For absolute axis only.
  27 +        steps-per-period        Number of steps (stable states) per period.
  28 +                                The values have the following meaning:
  29 +                                1: Full-period mode (default)
  30 +                                2: Half-period mode
  31 +                                4: Quarter-period mode
  32 +        steps                   Number of steps in a full turnaround of the
  33 +                                encoder. Only relevant for absolute axis.
  34 +                                Defaults to 24 which is a typical value for
  35 +                                such devices.
  36 +        wakeup                  Boolean, rotary encoder can wake up the
  37 +                                system.
  38 +        encoding                String, the method used to encode steps.
  39 +                                Supported are "gray" (the default and more
  40 +                                common) and "binary".
  41
  42
  43  Name:   rpi-backlight
  44 --- a/arch/arm/boot/dts/overlays/rotary-encoder-overlay.dts
  45 +++ b/arch/arm/boot/dts/overlays/rotary-encoder-overlay.dts
  46 @@ -28,16 +28,24 @@
  47                                         gpios = <&gpio 4 0>, <&gpio 17 0>;
  48                                         linux,axis = <0>; /* REL_X */
  49                                         rotary-encoder,encoding = "gray";
  50 -                                       rotary-encoder,relative-axis;
  51 +                                       rotary-encoder,steps = <24>; /* 24 default */
  52 +                                       rotary-encoder,steps-per-period = <1>; /* corresponds to full period mode. See README */
  53                         };
  54                 };
  55
  56         };
  57
  58         __overrides__ {
  59 -               rotary0_pin_a = <&rotary0>,"gpios:4",
  60 -                               <&rotary0_pins>,"brcm,pins:0";
  61 -               rotary0_pin_b = <&rotary0>,"gpios:16",
  62 -                               <&rotary0_pins>,"brcm,pins:4";
  63 +               rotary0_pin_a =     <&rotary0>,"gpios:4",
  64 +                                   <&rotary0_pins>,"brcm,pins:0";
  65 +               rotary0_pin_b =     <&rotary0>,"gpios:16",
  66 +                                   <&rotary0_pins>,"brcm,pins:4";
  67 +               relative_axis =     <&rotary0>,"rotary-encoder,relative-axis?";
  68 +               linux_axis =        <&rotary0>,"linux,axis:0";
  69 +               rollover =          <&rotary0>,"rotary-encoder,rollover?";
  70 +               steps-per-period =  <&rotary0>,"rotary-encoder,steps-per-period:0";
  71 +               steps =             <&rotary0>,"rotary-encoder,steps:0";
  72 +               wakeup =            <&rotary0>,"wakeup-source?";
  73 +               encoding =          <&rotary0>,"rotary-encoder,encoding";
  74         };
  75  };