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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.patch114
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";
++ };
++};