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115 lines
3.6 KiB
Diff
115 lines
3.6 KiB
Diff
From 498dfe7d12a047e4a3b466683b0b8138ea74ed9b Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Tue, 18 Sep 2018 11:08:07 +0100
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Subject: [PATCH 417/454] BCM270X_DT: Add gpio-fan overlay
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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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 | 8 +++
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.../boot/dts/overlays/gpio-fan-overlay.dts | 71 +++++++++++++++++++
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3 files changed, 80 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/gpio-fan-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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@@ -35,6 +35,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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fe-pi-audio.dtbo \
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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-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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@@ -563,6 +563,14 @@ Load: dtoverlay=googlevoicehat-soundca
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Params: <None>
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+Name: gpio-fan
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+Info: Configure a GPIO pin to control a cooling fan.
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+Load: dtoverlay=gpio-fan,<param>=<val>
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+Params: gpiopin GPIO used to control the fan (default 12)
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+ temp Temperature at which the fan switches on, in
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+ millicelcius (default 55000)
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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-fan-overlay.dts
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@@ -0,0 +1,71 @@
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+/*
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+ * Overlay for the Raspberry Pi GPIO Fan @ BCM GPIO12.
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+ * Optional parameters:
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+ * - "gpiopin" - default GPIO12
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+ * - "temp" - default 55000
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+ * Requires:
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+ * - kernel configurations: CONFIG_SENSORS_GPIO_FAN=m and CONFIG_SENSORS_PWM_FAN=m;
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+ * - kernel rebuid;
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+ * - DC Fan connected to GPIO via a N-MOSFET (2N7002)
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+ *
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+ * ┌─────────────────────┐
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+ * │Fan negative terminal│
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+ * └┬────────────────────┘
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+ * │
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+ * │──┘
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+ * [GPIO12]──────┤ │<─┐ 2N7002
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+ * │──┤
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+ * │
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+ * ─┴─
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+ * GND
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+ *
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+ * sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /boot/overlays/gpio-fan.dtbo gpio-fan.dts
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+ * sudo nano /boot/config.txt add "dtoverlay=gpio-fan" or "dtoverlay=gpio-fan,gpiopin=12,temp=45000"
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+ * or
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+ * sudo sh -c "echo '\n# Enable PI GPIO-Fan\ndtoverlay=gpio-fan\n' >> /boot/config.txt"
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+ * sudo sh -c "echo '\n# Enable PI GPIO-Fan\ndtoverlay=gpio-fan,gpiopin=12\n' >> /boot/config.txt"
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+ *
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+ */
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target-path = "/";
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+ __overlay__ {
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+ fan0: gpio-fan@0 {
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+ compatible = "gpio-fan";
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+ gpios = <&gpio 12 1>;
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+ gpio-fan,speed-map = <0 0>,
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+ <5000 1>;
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+ #cooling-cells = <2>;
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&cpu_thermal>;
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+ polling-delay = <2000>; /* milliseconds */
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+ __overlay__ {
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+ trips {
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+ cpu_hot: trip-point@0 {
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+ temperature = <55000>; /* (millicelsius) Fan started at 55°C */
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+ hysteresis = <5000>; /* (millicelsius) Fan stopped at 50°C */
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+ type = "active";
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+ };
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+ };
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+ cooling-maps {
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+ map0 {
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+ trip = <&cpu_hot>;
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+ cooling-device = <&fan0 1 1>;
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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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+ gpiopin = <&fan0>,"gpios:4", <&fan0>,"brcm,pins:0";
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+ temp = <&cpu_hot>,"temperature:0";
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+ };
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+};
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