A133 watchdog
AP-RESET 引脚接在电源管理PMIC上
MCU-SCK, MCU-SDA 与 主控通过I2C引脚通信,实现看门狗的功能
驱动
longan/kernel/linux-4.9/drivers/misc/wtd/watchdog.c
board.dts
twi3: twi@0x05002c00{
clock-frequency = <200000>;
pinctrl-0 = <&twi3_pins_a>;
pinctrl-1 = <&twi3_pins_b>;
status = "okay";
wtd@39 {
compatible = "allwinner,wtd";
reg = <0x39>;
status = "okay";
};
};
驱动节点
ceres-c3:/sys/devices/platform/soc/twi3/i2c-3/3-0039 # ls -al
lrwxrwxrwx 1 root root 0 2025-02-07 10:58 driver -> ../../../../../../bus/i2c/drivers/wtd
-r--r--r-- 1 root root 4096 2025-02-07 10:58 modalias
-r--r--r-- 1 root root 4096 2025-02-07 10:58 name
lrwxrwxrwx 1 root root 0 2025-02-07 10:58 of_node -> ../../../../../../firmware/devicetree/base/soc@03000000/twi@0x05002c00/wtd@39
drwxr-xr-x 2 root root 0 1970-01-01 08:00 power
lrwxrwxrwx 1 root root 0 2025-02-07 10:58 subsystem -> ../../../../../../bus/i2c
-rw-r--r-- 1 root root 4096 1970-01-01 08:00 uevent
-rw-r--r-- 1 root root 4096 2025-02-07 10:58 wtd_enable
测试
echo 0 > /sys/devices/platform/soc/twi3/i2c-3/3-0039/wtd_enable
FEATURED TAGS
Android
debug
dumpsys
shell
linux
Permission
心理学
ubuntu
JNI
android
IMS
systemui
selinux
投资
eSIM
androidstudio
performance
pms
wms
view
flutter
iptables
netd
property
c++
kernel
mqtt
usb
company
statusbar
docker
ssh
hardware
webrtc
recovery
web
camera
rk3288
ota
A133
driver
rockchip
rk3399
chip
rk3588
a133
qt
t113
buildroot
AI
MCU
硬件
markdown
rk3568
随笔
rk3576