diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0149-BCM270X_DT-Add-gpio-fan-overlay.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0149-BCM270X_DT-Add-gpio-fan-overlay.patch | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0149-BCM270X_DT-Add-gpio-fan-overlay.patch b/target/linux/bcm27xx/patches-4.19/950-0149-BCM270X_DT-Add-gpio-fan-overlay.patch new file mode 100644 index 0000000000..f252490382 --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0149-BCM270X_DT-Add-gpio-fan-overlay.patch @@ -0,0 +1,114 @@ +From 9762b3a015886c42941f535e688ffac1f56e35aa Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Tue, 18 Sep 2018 11:08:07 +0100 +Subject: [PATCH] BCM270X_DT: Add gpio-fan overlay + +Signed-off-by: Phil Elwell <phil@raspberrypi.org> +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 8 +++ + .../boot/dts/overlays/gpio-fan-overlay.dts | 71 +++++++++++++++++++ + 3 files changed, 80 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/gpio-fan-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -33,6 +33,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \ + fe-pi-audio.dtbo \ + goodix.dtbo \ + googlevoicehat-soundcard.dtbo \ ++ gpio-fan.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 +@@ -541,6 +541,14 @@ Load: dtoverlay=googlevoicehat-soundca + Params: <None> + + ++Name: gpio-fan ++Info: Configure a GPIO pin to control a cooling fan. ++Load: dtoverlay=gpio-fan,<param>=<val> ++Params: gpiopin GPIO used to control the fan (default 12) ++ temp Temperature at which the fan switches on, in ++ millicelcius (default 55000) ++ ++ + 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-fan-overlay.dts +@@ -0,0 +1,71 @@ ++/* ++ * Overlay for the Raspberry Pi GPIO Fan @ BCM GPIO12. ++ * Optional parameters: ++ * - "gpiopin" - default GPIO12 ++ * - "temp" - default 55000 ++ * Requires: ++ * - kernel configurations: CONFIG_SENSORS_GPIO_FAN=m and CONFIG_SENSORS_PWM_FAN=m; ++ * - kernel rebuid; ++ * - DC Fan connected to GPIO via a N-MOSFET (2N7002) ++ * ++ * ┌─────────────────────┐ ++ * │Fan negative terminal│ ++ * └┬────────────────────┘ ++ * │ ++ * │──┘ ++ * [GPIO12]──────┤ │<─┐ 2N7002 ++ * │──┤ ++ * │ ++ * ─┴─ ++ * GND ++ * ++ * sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /boot/overlays/gpio-fan.dtbo gpio-fan.dts ++ * sudo nano /boot/config.txt add "dtoverlay=gpio-fan" or "dtoverlay=gpio-fan,gpiopin=12,temp=45000" ++ * or ++ * sudo sh -c "echo '\n# Enable PI GPIO-Fan\ndtoverlay=gpio-fan\n' >> /boot/config.txt" ++ * sudo sh -c "echo '\n# Enable PI GPIO-Fan\ndtoverlay=gpio-fan,gpiopin=12\n' >> /boot/config.txt" ++ * ++ */ ++/dts-v1/; ++/plugin/; ++ ++/ { ++ compatible = "brcm,bcm2708"; ++ ++ fragment@0 { ++ target-path = "/"; ++ __overlay__ { ++ fan0: gpio-fan@0 { ++ compatible = "gpio-fan"; ++ gpios = <&gpio 12 1>; ++ gpio-fan,speed-map = <0 0>, ++ <5000 1>; ++ #cooling-cells = <2>; ++ }; ++ }; ++ }; ++ ++ fragment@1 { ++ target = <&cpu_thermal>; ++ polling-delay = <2000>; /* milliseconds */ ++ __overlay__ { ++ trips { ++ cpu_hot: trip-point@0 { ++ temperature = <55000>; /* (millicelsius) Fan started at 55°C */ ++ hysteresis = <5000>; /* (millicelsius) Fan stopped at 50°C */ ++ type = "active"; ++ }; ++ }; ++ cooling-maps { ++ map0 { ++ trip = <&cpu_hot>; ++ cooling-device = <&fan0 1 1>; ++ }; ++ }; ++ }; ++ }; ++ __overrides__ { ++ gpiopin = <&fan0>,"gpios:4", <&fan0>,"brcm,pins:0"; ++ temp = <&cpu_hot>,"temperature:0"; ++ }; ++}; |