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Many boards like hisilicon D02 board use standard gpio key to power down system.
A description of gpio-key in dts shown below,
gpio_keys {
compatible = "gpio-keys";
#address-cells = <1>;
#size-cells = <0>;
pwrbutton {
label = "Power Button";
gpios = <&porta 8 1>;
linux,code = <116>; // KEY_POWER, used by SC System Power Down
};
};
-bash-4.3# udevadm info -a /dev/input/event3
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/platform/gpio_keys/input/input3/event3':
KERNEL=="event3"
SUBSYSTEM=="input"
DRIVER==""
looking at parent device '/devices/platform/gpio_keys/input/input3':
KERNELS=="input3"
SUBSYSTEMS=="input"
DRIVERS==""
ATTRS{name}=="gpio_keys"
ATTRS{phys}=="gpio-keys/input0"
ATTRS{uniq}==""
ATTRS{properties}=="0"
looking at parent device '/devices/platform/gpio_keys':
KERNELS=="gpio_keys"
SUBSYSTEMS=="platform"
DRIVERS=="gpio-keys"
ATTRS{keys}=="116"
ATTRS{switches}==""
ATTRS{driver_override}=="(null)"
ATTRS{disabled_keys}==""
ATTRS{disabled_switches}==""
looking at parent device '/devices/platform':
KERNELS=="platform"
SUBSYSTEMS==""
DRIVERS==""
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This PMIC is found on TI AM335x based boards like the beaglebone and
beaglebone black.
root@beaglebone-white:~# udevadm info -a /dev/input/event0
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device
'/devices/ocp.3/44e0b000.i2c/i2c-0/0-0024/input/input0/event0':
KERNEL=="event0"
SUBSYSTEM=="input"
DRIVER==""
looking at parent device
'/devices/ocp.3/44e0b000.i2c/i2c-0/0-0024/input/input0':
KERNELS=="input0"
SUBSYSTEMS=="input"
DRIVERS==""
ATTRS{name}=="tps65217_pwr_but"
ATTRS{phys}==""
ATTRS{uniq}==""
ATTRS{properties}=="0"
looking at parent device '/devices/ocp.3/44e0b000.i2c/i2c-0/0-0024':
KERNELS=="0-0024"
SUBSYSTEMS=="i2c"
DRIVERS=="tps65217"
ATTRS{name}=="tps65217"
looking at parent device '/devices/ocp.3/44e0b000.i2c/i2c-0':
KERNELS=="i2c-0"
SUBSYSTEMS=="i2c"
DRIVERS==""
ATTRS{name}=="OMAP I2C adapter"
looking at parent device '/devices/ocp.3/44e0b000.i2c':
KERNELS=="44e0b000.i2c"
SUBSYSTEMS=="platform"
DRIVERS=="omap_i2c"
looking at parent device '/devices/ocp.3':
KERNELS=="ocp.3"
SUBSYSTEMS=="platform"
DRIVERS==""
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https://bugs.freedesktop.org/show_bug.cgi?id=84201
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In udev rules the labels must be assigned to GOTO keys with '='.
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