target/linux/brcm2708/patches-4.19/950-0723-overlays-gpio-shutdown-Add-debounce-parameter.patch

   1 From 499e28e3a38f0de843b07bf4bbf7692b07c5e3ba Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 7 Oct 2019 13:51:07 +0100
   4 Subject: [PATCH] overlays: gpio-shutdown: Add debounce parameter
   5
   6 Give the gpio-shutdown overlay a debounce parameter that requires
   7 the GPIO to be held at the relevant level for a specified number
   8 of milliseconds. The default value is 100 - higher than the driver
   9 default of 5ms to avoid unfortunate glitches.
  10
  11 See: https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=253680
  12
  13 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  14 ---
  15  arch/arm/boot/dts/overlays/README                    | 3 +++
  16  arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts | 2 ++
  17  2 files changed, 5 insertions(+)
  18
  19 --- a/arch/arm/boot/dts/overlays/README
  20 +++ b/arch/arm/boot/dts/overlays/README
  21 @@ -803,6 +803,9 @@ Params: gpio_pin                GPIO pin
  22                                  Note that the default pin (GPIO3) has an
  23                                  external pullup.
  24
  25 +        debounce                Specify the debounce interval in milliseconds
  26 +                                (default 100)
  27 +
  28
  29  Name:   hd44780-lcd
  30  Info:   Configures an HD44780 compatible LCD display. Uses 4 gpio pins for
  31 --- a/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
  32 +++ b/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
  33 @@ -53,6 +53,7 @@
  34                                         label = "shutdown";
  35                                         linux,code = <116>; // KEY_POWER
  36                                         gpios = <&gpio 3 1>;
  37 +                                       debounce-interval = <100>; // ms
  38                                 };
  39                         };
  40                 };
  41 @@ -75,6 +76,7 @@
  42
  43                 // Allow setting the active_low flag. 0 = active high, 1 = active low
  44                 active_low = <&button>,"gpios:8";
  45 +               debounce = <&button>,"debounce-interval:0";
  46         };
  47
  48  };