brcm2708: update to latest patches from RPi Foundation

[openwrt/openwrt.git] / target / linux / brcm2708 / patches-4.19 / 950-0152-Update-gpio-fan-overlay.dts-2711.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0152-Update-gpio-fan-overlay.dts-2711.patch b/target/linux/brcm2708/patches-4.19/950-0152-Update-gpio-fan-overlay.dts-2711.patch
new file mode 100644 (file)
index 0000000..c8f3759
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0152-Update-gpio-fan-overlay.dts-2711.patch
@@ -0,0 +1,72 @@
+From 4a2be174938ac115beac4f07fa8b7ee33406cde8 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] 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";
+                               };
+                       };