2019-09-19 14:43:19 +00:00
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From 4a2be174938ac115beac4f07fa8b7ee33406cde8 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Paul <paulenuta@users.noreply.github.com>
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Date: Thu, 11 Oct 2018 12:17:20 +0300
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] Update gpio-fan-overlay.dts (#2711)
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2019-07-09 18:32:28 +00:00
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Add references, links, clear details, some typo correction.
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---
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.../boot/dts/overlays/gpio-fan-overlay.dts | 36 +++++++++++--------
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1 file changed, 22 insertions(+), 14 deletions(-)
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--- a/arch/arm/boot/dts/overlays/gpio-fan-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/gpio-fan-overlay.dts
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@@ -1,29 +1,37 @@
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/*
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* Overlay for the Raspberry Pi GPIO Fan @ BCM GPIO12.
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+ * References:
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+ * - https://www.raspberrypi.org/forums/viewtopic.php?f=107&p=1367135#p1365084
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+ *
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* Optional parameters:
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- * - "gpiopin" - default GPIO12
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- * - "temp" - default 55000
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+ * - "gpiopin" - BCM number of the pin driving the fan, default 12 (GPIO12);
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+ * - "temp" - CPU temperature at which fan is started in millicelsius, default 55000;
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+ *
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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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+ * - kernel configurations: CONFIG_SENSORS_GPIO_FAN=m;
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+ * - kernel rebuild;
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+ * - N-MOSFET connected to gpiopin, 2N7002-[https://en.wikipedia.org/wiki/2N7000];
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+ * - DC Fan connected to N-MOSFET Drain terminal, a 12V fan is working fine and quite silently;
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+ * [https://www.tme.eu/en/details/ee40101s1-999-a/dc12v-fans/sunon/ee40101s1-1000u-999/]
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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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+ * │D
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+ * G │──┘
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* [GPIO12]──────┤ │<─┐ 2N7002
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* │──┤
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- * │
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+ * │S
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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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+ * Build:
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+ * - `sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /boot/overlays/gpio-fan.dtbo gpio-fan-overlay.dts`
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+ * Activate:
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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 'printf "\n# Enable PI GPIO-Fan Default\ndtoverlay=gpio-fan\n" >> /boot/config.txt'
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+ * - sudo sh -c 'printf "\n# Enable PI GPIO-Fan Custom\ntoverlay=gpio-fan,gpiopin=12,temp=45000\n" >> /boot/config.txt'
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*
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*/
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/dts-v1/;
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@@ -52,7 +60,7 @@
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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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+ hysteresis = <10000>; /* (millicelsius) Fan stopped at 45°C */
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type = "active";
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};
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};
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