mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
73 lines
3.2 KiB
Diff
73 lines
3.2 KiB
Diff
|
From 4f420b1d3606ec5652dc8fe8092756158f652755 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Paul <paulenuta@users.noreply.github.com>
|
||
|
|
Date: Thu, 11 Oct 2018 12:17:20 +0300
|
||
|
|
Subject: [PATCH 425/454] Update gpio-fan-overlay.dts (#2711)
|
||
|
|
|
||
|
|
Add references, links, clear details, some typo correction.
|
||
|
|
---
|
||
|
|
.../boot/dts/overlays/gpio-fan-overlay.dts | 36 +++++++++++--------
|
||
|
|
1 file changed, 22 insertions(+), 14 deletions(-)
|
||
|
|
|
||
|
|
--- a/arch/arm/boot/dts/overlays/gpio-fan-overlay.dts
|
||
|
|
+++ b/arch/arm/boot/dts/overlays/gpio-fan-overlay.dts
|
||
|
|
@@ -1,29 +1,37 @@
|
||
|
|
/*
|
||
|
|
* Overlay for the Raspberry Pi GPIO Fan @ BCM GPIO12.
|
||
|
|
+ * References:
|
||
|
|
+ * - https://www.raspberrypi.org/forums/viewtopic.php?f=107&p=1367135#p1365084
|
||
|
|
+ *
|
||
|
|
* Optional parameters:
|
||
|
|
- * - "gpiopin" - default GPIO12
|
||
|
|
- * - "temp" - default 55000
|
||
|
|
+ * - "gpiopin" - BCM number of the pin driving the fan, default 12 (GPIO12);
|
||
|
|
+ * - "temp" - CPU temperature at which fan is started in millicelsius, 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)
|
||
|
|
+ * - kernel configurations: CONFIG_SENSORS_GPIO_FAN=m;
|
||
|
|
+ * - kernel rebuild;
|
||
|
|
+ * - N-MOSFET connected to gpiopin, 2N7002-[https://en.wikipedia.org/wiki/2N7000];
|
||
|
|
+ * - DC Fan connected to N-MOSFET Drain terminal, a 12V fan is working fine and quite silently;
|
||
|
|
+ * [https://www.tme.eu/en/details/ee40101s1-999-a/dc12v-fans/sunon/ee40101s1-1000u-999/]
|
||
|
|
*
|
||
|
|
* ┌─────────────────────┐
|
||
|
|
* │Fan negative terminal│
|
||
|
|
* └┬────────────────────┘
|
||
|
|
- * │
|
||
|
|
- * │──┘
|
||
|
|
+ * │D
|
||
|
|
+ * G │──┘
|
||
|
|
* [GPIO12]──────┤ │<─┐ 2N7002
|
||
|
|
* │──┤
|
||
|
|
- * │
|
||
|
|
+ * │S
|
||
|
|
* ─┴─
|
||
|
|
* 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"
|
||
|
|
+ * Build:
|
||
|
|
+ * - `sudo dtc -W no-unit_address_vs_reg -@ -I dts -O dtb -o /boot/overlays/gpio-fan.dtbo gpio-fan-overlay.dts`
|
||
|
|
+ * Activate:
|
||
|
|
+ * - sudo nano /boot/config.txt add "dtoverlay=gpio-fan" or "dtoverlay=gpio-fan,gpiopin=12,temp=45000"
|
||
|
|
+ * or
|
||
|
|
+ * - sudo sh -c 'printf "\n# Enable PI GPIO-Fan Default\ndtoverlay=gpio-fan\n" >> /boot/config.txt'
|
||
|
|
+ * - sudo sh -c 'printf "\n# Enable PI GPIO-Fan Custom\ntoverlay=gpio-fan,gpiopin=12,temp=45000\n" >> /boot/config.txt'
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
/dts-v1/;
|
||
|
|
@@ -52,7 +60,7 @@
|
||
|
|
trips {
|
||
|
|
cpu_hot: trip-point@0 {
|
||
|
|
temperature = <55000>; /* (millicelsius) Fan started at 55°C */
|
||
|
|
- hysteresis = <5000>; /* (millicelsius) Fan stopped at 50°C */
|
||
|
|
+ hysteresis = <10000>; /* (millicelsius) Fan stopped at 45°C */
|
||
|
|
type = "active";
|
||
|
|
};
|
||
|
|
};
|