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