diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0913-overlays-Add-gpio-hog-overlay.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.15/950-0913-overlays-Add-gpio-hog-overlay.patch | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0913-overlays-Add-gpio-hog-overlay.patch b/target/linux/bcm27xx/patches-5.15/950-0913-overlays-Add-gpio-hog-overlay.patch new file mode 100644 index 0000000000..47a99dbe15 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.15/950-0913-overlays-Add-gpio-hog-overlay.patch @@ -0,0 +1,81 @@ +From a2948fd59692f1d30ce64035bed33b32997a0ad7 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Mon, 16 May 2022 12:16:46 +0100 +Subject: [PATCH] overlays: Add gpio-hog overlay + +Add an overlay to activate a hog on a specified pin. Note that +hogged GPIOs are not available for other uses, i.e. drivers or +gpioset/gpioget. + +Inspired by a Forum thread here: + + https://forums.raspberrypi.com/viewtopic.php?t=334286 + +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 11 ++++++++ + .../boot/dts/overlays/gpio-hog-overlay.dts | 27 +++++++++++++++++++ + 3 files changed, 39 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/gpio-hog-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -59,6 +59,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ + goodix.dtbo \ + googlevoicehat-soundcard.dtbo \ + gpio-fan.dtbo \ ++ gpio-hog.dtbo \ + gpio-ir.dtbo \ + gpio-ir-tx.dtbo \ + gpio-key.dtbo \ +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -1061,6 +1061,17 @@ Params: gpiopin GPIO use + millicelcius (default 55000) + + ++Name: gpio-hog ++Info: Activate a "hog" for a GPIO - request that the kernel configures it as ++ an output, driven low or high as indicated by the presence or absence ++ of the active_low parameter. Note that a hogged GPIO is not available ++ to other drivers or for gpioset/gpioget. ++Load: dtoverlay=gpio-hog,<param>=<val> ++Params: gpio GPIO pin to hog (default 26) ++ active_low If set, the hog drives the GPIO low (defaults ++ to off - the GPIO is driven high) ++ ++ + Name: gpio-ir + Info: Use GPIO pin as rc-core style infrared receiver input. The rc-core- + based gpio_ir_recv driver maps received keys directly to a +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/gpio-hog-overlay.dts +@@ -0,0 +1,27 @@ ++// Configure a "hog" on the specified GPIO ++/dts-v1/; ++/plugin/; ++ ++#include <dt-bindings/gpio/gpio.h> ++ ++/ { ++ compatible = "brcm,bcm2835"; ++ ++ fragment@0 { ++ target = <&gpio>; ++ __overlay__ { ++ hog: hog@1a { ++ gpio-hog; ++ gpios = <26 GPIO_ACTIVE_HIGH>; ++ output-high; ++ }; ++ }; ++ }; ++ ++ __overrides__ { ++ gpio = <&hog>,"reg:0", ++ <&hog>,"gpios:0"; ++ active_low = <&hog>,"output-high!", ++ <&hog>,"output-low?"; ++ }; ++}; |