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silver2row

udevadm

silver2row
Mar 22nd, 2023
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  1.  
  2. Udevadm info starts with the device specified by the devpath and then
  3. walks up the chain of parent devices. It prints for every device
  4. found, all possible attributes in the udev rules key format.
  5. A rule to match, can be composed by the attributes of the device
  6. and the attributes from one single parent device.
  7.  
  8.   looking at device '/devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@300000/48302000.target-module/48302000.epwmss/48302200.pwm/pwm/pwmchip5/pwm1':
  9.     KERNEL=="pwm1"
  10.     SUBSYSTEM==""
  11.     DRIVER==""
  12.     ATTR{duty_cycle}=="0"
  13.     ATTR{enable}=="0"
  14.     ATTR{period}=="0"
  15.     ATTR{polarity}=="normal"
  16.     ATTR{power/async}=="disabled"
  17.     ATTR{power/control}=="auto"
  18.     ATTR{power/runtime_active_kids}=="0"
  19.     ATTR{power/runtime_active_time}=="0"
  20.     ATTR{power/runtime_enabled}=="disabled"
  21.     ATTR{power/runtime_status}=="unsupported"
  22.     ATTR{power/runtime_suspended_time}=="0"
  23.     ATTR{power/runtime_usage}=="0"
  24.  
  25.   looking at parent device '/devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@300000/48302000.target-module/48302000.epwmss/48302200.pwm/pwm/pwmchip5':
  26.     KERNELS=="pwmchip5"
  27.     SUBSYSTEMS=="pwm"
  28.     DRIVERS==""
  29.     ATTRS{npwm}=="2"
  30.     ATTRS{power/async}=="disabled"
  31.     ATTRS{power/control}=="auto"
  32.     ATTRS{power/runtime_active_kids}=="0"
  33.     ATTRS{power/runtime_active_time}=="0"
  34.     ATTRS{power/runtime_enabled}=="disabled"
  35.     ATTRS{power/runtime_status}=="unsupported"
  36.     ATTRS{power/runtime_suspended_time}=="0"
  37.     ATTRS{power/runtime_usage}=="0"
  38.  
  39.   looking at parent device '/devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@300000/48302000.target-module/48302000.epwmss/48302200.pwm':
  40.     KERNELS=="48302200.pwm"
  41.     SUBSYSTEMS=="platform"
  42.     DRIVERS=="ehrpwm"
  43.     ATTRS{driver_override}=="(null)"
  44.     ATTRS{power/async}=="disabled"
  45.     ATTRS{power/control}=="auto"
  46.     ATTRS{power/runtime_active_kids}=="0"
  47.     ATTRS{power/runtime_active_time}=="0"
  48.     ATTRS{power/runtime_enabled}=="enabled"
  49.     ATTRS{power/runtime_status}=="suspended"
  50.     ATTRS{power/runtime_suspended_time}=="332460"
  51.     ATTRS{power/runtime_usage}=="0"
  52.  
  53.   looking at parent device '/devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@300000/48302000.target-module/48302000.epwmss':
  54.     KERNELS=="48302000.epwmss"
  55.     SUBSYSTEMS=="platform"
  56.     DRIVERS=="pwmss"
  57.     ATTRS{driver_override}=="(null)"
  58.     ATTRS{power/async}=="disabled"
  59.     ATTRS{power/control}=="auto"
  60.     ATTRS{power/runtime_active_kids}=="1"
  61.     ATTRS{power/runtime_active_time}=="297692"
  62.     ATTRS{power/runtime_enabled}=="enabled"
  63.     ATTRS{power/runtime_status}=="active"
  64.     ATTRS{power/runtime_suspended_time}=="35014"
  65.     ATTRS{power/runtime_usage}=="0"
  66.  
  67.   looking at parent device '/devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@300000/48302000.target-module':
  68.     KERNELS=="48302000.target-module"
  69.     SUBSYSTEMS=="platform"
  70.     DRIVERS=="ti-sysc"
  71.     ATTRS{driver_override}=="(null)"
  72.     ATTRS{power/async}=="disabled"
  73.     ATTRS{power/control}=="auto"
  74.     ATTRS{power/runtime_active_kids}=="1"
  75.     ATTRS{power/runtime_active_time}=="297785"
  76.     ATTRS{power/runtime_enabled}=="enabled"
  77.     ATTRS{power/runtime_status}=="active"
  78.     ATTRS{power/runtime_suspended_time}=="34955"
  79.     ATTRS{power/runtime_usage}=="0"
  80.  
  81.   looking at parent device '/devices/platform/ocp/48000000.interconnect/48000000.interconnect:segment@300000':
  82.     KERNELS=="48000000.interconnect:segment@300000"
  83.     SUBSYSTEMS=="platform"
  84.     DRIVERS==""
  85.     ATTRS{driver_override}=="(null)"
  86.     ATTRS{power/async}=="disabled"
  87.     ATTRS{power/control}=="auto"
  88.     ATTRS{power/runtime_active_kids}=="4"
  89.     ATTRS{power/runtime_active_time}=="0"
  90.     ATTRS{power/runtime_enabled}=="disabled"
  91.     ATTRS{power/runtime_status}=="unsupported"
  92.     ATTRS{power/runtime_suspended_time}=="0"
  93.     ATTRS{power/runtime_usage}=="0"
  94.  
  95.   looking at parent device '/devices/platform/ocp/48000000.interconnect':
  96.     KERNELS=="48000000.interconnect"
  97.     SUBSYSTEMS=="platform"
  98.     DRIVERS==""
  99.     ATTRS{driver_override}=="(null)"
  100.     ATTRS{power/async}=="disabled"
  101.     ATTRS{power/control}=="auto"
  102.     ATTRS{power/runtime_active_kids}=="0"
  103.     ATTRS{power/runtime_active_time}=="0"
  104.     ATTRS{power/runtime_enabled}=="disabled"
  105.     ATTRS{power/runtime_status}=="unsupported"
  106.     ATTRS{power/runtime_suspended_time}=="0"
  107.     ATTRS{power/runtime_usage}=="0"
  108.  
  109.   looking at parent device '/devices/platform/ocp':
  110.     KERNELS=="ocp"
  111.     SUBSYSTEMS=="platform"
  112.     DRIVERS==""
  113.     ATTRS{driver_override}=="(null)"
  114.     ATTRS{power/async}=="disabled"
  115.     ATTRS{power/control}=="auto"
  116.     ATTRS{power/runtime_active_kids}=="9"
  117.     ATTRS{power/runtime_active_time}=="0"
  118.     ATTRS{power/runtime_enabled}=="disabled"
  119.     ATTRS{power/runtime_status}=="unsupported"
  120.     ATTRS{power/runtime_suspended_time}=="0"
  121.     ATTRS{power/runtime_usage}=="0"
  122.  
  123.   looking at parent device '/devices/platform':
  124.     KERNELS=="platform"
  125.     SUBSYSTEMS==""
  126.     DRIVERS==""
  127.     ATTRS{power/async}=="disabled"
  128.     ATTRS{power/control}=="auto"
  129.     ATTRS{power/runtime_active_kids}=="1"
  130.     ATTRS{power/runtime_active_time}=="0"
  131.     ATTRS{power/runtime_enabled}=="disabled"
  132.     ATTRS{power/runtime_status}=="unsupported"
  133.     ATTRS{power/runtime_suspended_time}=="0"
  134.     ATTRS{power/runtime_usage}=="0"
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