diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0425-Update-gpio-fan-overlay.dts-2711.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0425-Update-gpio-fan-overlay.dts-2711.patch | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0425-Update-gpio-fan-overlay.dts-2711.patch b/target/linux/brcm2708/patches-4.14/950-0425-Update-gpio-fan-overlay.dts-2711.patch new file mode 100644 index 0000000000..cbeea060b3 --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0425-Update-gpio-fan-overlay.dts-2711.patch @@ -0,0 +1,72 @@ +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"; + }; + }; |