git.openwrt.org Git - openwrt/staging/adrian.git/blob

   1 From e253d03936265dc4ab8ae9ae89d2a885e80a45a6 Mon Sep 17 00:00:00 2001
   2 From: Matthias Reichl <hias@horus.com>
   3 Date: Fri, 6 Mar 2020 11:08:10 +0100
   4 Subject: [PATCH] gpio-ir-overlay: add parameter to configure signal
   5  polarity (#3490)
   6
   7 Standard IR receivers use inverted / active-low signalling
   8 and the gpio-ir overlay configures the GPIO appropriately
   9 as GPIO_ACTIVE_LOW (1).
  10
  11 In order to support (rather rare) non-inverted / active-high
  12 signalling the GPIO needs to be configured as GPIO_ACTIVE_HIGH (0).
  13
  14 Add an "invert" parameter to override this like in the gpio-ir-tx
  15 overlay.
  16
  17 Signed-off-by: Matthias Reichl <hias@horus.com>
  18 ---
  19  arch/arm/boot/dts/overlays/README              | 4 ++++
  20  arch/arm/boot/dts/overlays/gpio-ir-overlay.dts | 1 +
  21  2 files changed, 5 insertions(+)
  22
  23 --- a/arch/arm/boot/dts/overlays/README
  24 +++ b/arch/arm/boot/dts/overlays/README
  25 @@ -754,6 +754,10 @@ Params: gpio_pin                Input pi
  26          gpio_pull               Desired pull-up/down state (off, down, up)
  27                                  Default is "up".
  28
  29 +        invert                  "1" = invert the input (active-low signalling).
  30 +                                "0" = non-inverted input (active-high
  31 +                                signalling). Default is "1".
  32 +
  33          rc-map-name             Default rc keymap (can also be changed by
  34                                  ir-keytable), defaults to "rc-rc6-mce"
  35
  36 --- a/arch/arm/boot/dts/overlays/gpio-ir-overlay.dts
  37 +++ b/arch/arm/boot/dts/overlays/gpio-ir-overlay.dts
  38 @@ -42,6 +42,7 @@
  39                                  <&gpio_ir_pins>,"brcm,pins:0",
  40                                  <&gpio_ir_pins>,"reg:0";
  41                  gpio_pull = <&gpio_ir_pins>,"brcm,pull:0";              // pull-up/down state
  42 +                invert = <&gpio_ir>,"gpios:8";                          // 0 = active high input
  43
  44                  rc-map-name = <&gpio_ir>,"linux,rc-map-name";           // default rc map
  45          };