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