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82 lines
2.5 KiB
Diff
82 lines
2.5 KiB
Diff
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From a2948fd59692f1d30ce64035bed33b32997a0ad7 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Mon, 16 May 2022 12:16:46 +0100
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Subject: [PATCH] overlays: Add gpio-hog overlay
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Add an overlay to activate a hog on a specified pin. Note that
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hogged GPIOs are not available for other uses, i.e. drivers or
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gpioset/gpioget.
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Inspired by a Forum thread here:
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https://forums.raspberrypi.com/viewtopic.php?t=334286
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 11 ++++++++
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.../boot/dts/overlays/gpio-hog-overlay.dts | 27 +++++++++++++++++++
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3 files changed, 39 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/gpio-hog-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -59,6 +59,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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goodix.dtbo \
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googlevoicehat-soundcard.dtbo \
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gpio-fan.dtbo \
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+ gpio-hog.dtbo \
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gpio-ir.dtbo \
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gpio-ir-tx.dtbo \
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gpio-key.dtbo \
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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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@@ -1061,6 +1061,17 @@ Params: gpiopin GPIO use
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millicelcius (default 55000)
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+Name: gpio-hog
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+Info: Activate a "hog" for a GPIO - request that the kernel configures it as
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+ an output, driven low or high as indicated by the presence or absence
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+ of the active_low parameter. Note that a hogged GPIO is not available
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+ to other drivers or for gpioset/gpioget.
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+Load: dtoverlay=gpio-hog,<param>=<val>
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+Params: gpio GPIO pin to hog (default 26)
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+ active_low If set, the hog drives the GPIO low (defaults
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+ to off - the GPIO is driven high)
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+
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+
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Name: gpio-ir
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Info: Use GPIO pin as rc-core style infrared receiver input. The rc-core-
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based gpio_ir_recv driver maps received keys directly to a
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/gpio-hog-overlay.dts
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@@ -0,0 +1,27 @@
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+// Configure a "hog" on the specified GPIO
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/gpio/gpio.h>
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ hog: hog@1a {
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+ gpio-hog;
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+ gpios = <26 GPIO_ACTIVE_HIGH>;
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+ output-high;
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+ };
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+ };
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+ };
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+
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+ __overrides__ {
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+ gpio = <&hog>,"reg:0",
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+ <&hog>,"gpios:0";
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+ active_low = <&hog>,"output-high!",
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+ <&hog>,"output-low?";
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+ };
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+};
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