Fixed USB /dev/name for USB Micro Teleinfo device


  • Staff

    Today I received a mail from a user who asked me how to fix /dev/ttyUSBx name for Micro Teleinfo devices. This make sense because on linux, ordering number can sometime be different if you have multiple USB Serial device connected (whatever chip in it such as FTDI, PL2303, CP2302, CH340, … Continue Reading

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  • Hi Charles,
    thank you for your post. I have the similar issue when I have 2 usb to serial port converters and every time I restart my RPi2 they show as different /dev/ttyUSBx. The problem is that these are cheap chinease converters and they dont have unique serial number. Here is my lsusb

    Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
    Bus 001 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
    Bus 001 Device 005: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
    Bus 001 Device 006: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter

    I have actually 3 usb converters but the 3rd one has serial number but the 2 chinease converters dont. Any idea how to fix this? I am struggling to write the udev rule without serial number, i guess it is not possible.
    Thanks a log in advance.
    Regards,
    Jan


  • Staff

    @jan
    could you post a result of each

    udevadm info --attribute-walk -n /dev/ttyUSBx
    

    Pretty sure we can find some interesting different data



  • @Charles here it is, thanks for your help, let me know if you spot something in the data:

    $ udevadm info --attribute-walk -n /dev/ttyUSB0

    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/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/ttyUSB0/tty/ttyUSB0':
    KERNEL=="ttyUSB0"
    SUBSYSTEM=="tty"
    DRIVER==""

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0/ttyUSB0':
    KERNELS=="ttyUSB0"
    SUBSYSTEMS=="usb-serial"
    DRIVERS=="ftdi_sio"
    ATTRS{port_number}=="0"
    ATTRS{latency_timer}=="1"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2:1.0':
    KERNELS=="1-1.2:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="ftdi_sio"
    ATTRS{bInterfaceClass}=="ff"
    ATTRS{bInterfaceSubClass}=="ff"
    ATTRS{bInterfaceProtocol}=="ff"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{authorized}=="1"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{interface}=="Papouch SB485S (SC)"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2':
    KERNELS=="1-1.2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="1.2"
    ATTRS{idVendor}=="0403"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="4"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="100mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0600"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="PPTPLYYD"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="36003915"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Papouch s.r.o."
    ATTRS{removable}=="removable"
    ATTRS{idProduct}=="6001"
    ATTRS{bDeviceClass}=="00"
    ATTRS{product}=="Papouch SB485S (SC)"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="02"
    ATTRS{devpath}=="1"
    ATTRS{idVendor}=="0424"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="2"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="2mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="5"
    ATTRS{bcdDevice}=="0200"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="54"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="9514"
    ATTRS{bDeviceClass}=="09"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="1"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bcdDevice}=="0404"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="3f980000.usb"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="25"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 4.4.27-v7+ dwc_otg_hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="DWC OTG Controller"

    looking at parent device '/devices/platform/soc/3f980000.usb':
    KERNELS=="3f980000.usb"
    SUBSYSTEMS=="platform"
    DRIVERS=="dwc_otg"
    ATTRS{hnp}=="HstNegScs = 0x0"
    ATTRS{srp}=="SesReqScs = 0x1"
    ATTRS{regvalue}=="invalid offset"
    ATTRS{hsic_connect}=="HSIC Connect = 0x1"
    ATTRS{guid}=="GUID = 0x2708a000"
    ATTRS{mode}=="Mode = 0x1"
    ATTRS{srpcapable}=="SRPCapable = 0x1"
    ATTRS{regdump}=="Register Dump"
    ATTRS{gpvndctl}=="GPVNDCTL = 0x00000000"
    ATTRS{ggpio}=="GGPIO = 0x00000000"
    ATTRS{hprt0}=="HPRT0 = 0x00001405"
    ATTRS{wr_reg_test}=="Time to write GNPTXFSIZ reg 10000000 times: 1060 msecs (106 jiffies)"
    ATTRS{driver_override}=="(null)"
    ATTRS{hcd_frrem}=="HCD Dump Frame Remaining"
    ATTRS{mode_ch_tim_en}=="Mode Change Ready Timer Enable = 0x0"
    ATTRS{gnptxfsiz}=="GNPTXFSIZ = 0x01000306"
    ATTRS{remote_wakeup}=="Remote Wakeup Sig = 0 Enabled = 0 LPM Remote Wakeup = 0"
    ATTRS{busconnected}=="Bus Connected = 0x1"
    ATTRS{hcddump}=="HCD Dump"
    ATTRS{gotgctl}=="GOTGCTL = 0x001c0001"
    ATTRS{spramdump}=="SPRAM Dump"
    ATTRS{grxfsiz}=="GRXFSIZ = 0x00000306"
    ATTRS{gsnpsid}=="GSNPSID = 0x4f54280a"
    ATTRS{gusbcfg}=="GUSBCFG = 0x20001700"
    ATTRS{hptxfsiz}=="HPTXFSIZ = 0x02000406"
    ATTRS{devspeed}=="Device Speed = 0x0"
    ATTRS{fr_interval}=="Frame Interval = 0x1d4c"
    ATTRS{rem_wakeup_pwrdn}==""
    ATTRS{bussuspend}=="Bus Suspend = 0x0"
    ATTRS{buspower}=="Bus Power = 0x1"
    ATTRS{hnpcapable}=="HNPCapable = 0x1"
    ATTRS{rd_reg_test}=="Time to read GNPTXFSIZ reg 10000000 times: 2140 msecs (214 jiffies)"
    ATTRS{enumspeed}=="Device Enumeration Speed = 0x1"
    ATTRS{inv_sel_hsic}=="Invert Select HSIC = 0x0"
    ATTRS{regoffset}=="0xffffffff"

    looking at parent device '/devices/platform/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS==""
    ATTRS{driver_override}=="(null)"

    looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""

     $ udevadm info --attribute-walk -n /dev/ttyUSB1
    

    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/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0/ttyUSB1/tty/ttyUSB1':
    KERNEL=="ttyUSB1"
    SUBSYSTEM=="tty"
    DRIVER==""

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0/ttyUSB1':
    KERNELS=="ttyUSB1"
    SUBSYSTEMS=="usb-serial"
    DRIVERS=="ch341-uart"
    ATTRS{port_number}=="0"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0':
    KERNELS=="1-1.4:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="ch341"
    ATTRS{bInterfaceClass}=="ff"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{bInterfaceProtocol}=="02"
    ATTRS{bNumEndpoints}=="03"
    ATTRS{authorized}=="1"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4':
    KERNELS=="1-1.4"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="1.4"
    ATTRS{idVendor}=="1a86"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="5"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="96mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0254"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 1.10"
    ATTRS{urbnum}=="7492"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="removable"
    ATTRS{idProduct}=="7523"
    ATTRS{bDeviceClass}=="ff"
    ATTRS{product}=="USB2.0-Serial"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="02"
    ATTRS{devpath}=="1"
    ATTRS{idVendor}=="0424"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="2"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="2mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="5"
    ATTRS{bcdDevice}=="0200"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="54"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="9514"
    ATTRS{bDeviceClass}=="09"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="1"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bcdDevice}=="0404"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="3f980000.usb"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="25"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 4.4.27-v7+ dwc_otg_hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="DWC OTG Controller"

    looking at parent device '/devices/platform/soc/3f980000.usb':
    KERNELS=="3f980000.usb"
    SUBSYSTEMS=="platform"
    DRIVERS=="dwc_otg"
    ATTRS{hnp}=="HstNegScs = 0x0"
    ATTRS{srp}=="SesReqScs = 0x1"
    ATTRS{regvalue}=="invalid offset"
    ATTRS{hsic_connect}=="HSIC Connect = 0x1"
    ATTRS{guid}=="GUID = 0x2708a000"
    ATTRS{mode}=="Mode = 0x1"
    ATTRS{srpcapable}=="SRPCapable = 0x1"
    ATTRS{regdump}=="Register Dump"
    ATTRS{gpvndctl}=="GPVNDCTL = 0x00000000"
    ATTRS{ggpio}=="GGPIO = 0x00000000"
    ATTRS{hprt0}=="HPRT0 = 0x00001405"
    ATTRS{wr_reg_test}=="Time to write GNPTXFSIZ reg 10000000 times: 870 msecs (87 jiffies)"
    ATTRS{driver_override}=="(null)"
    ATTRS{hcd_frrem}=="HCD Dump Frame Remaining"
    ATTRS{mode_ch_tim_en}=="Mode Change Ready Timer Enable = 0x0"
    ATTRS{gnptxfsiz}=="GNPTXFSIZ = 0x01000306"
    ATTRS{remote_wakeup}=="Remote Wakeup Sig = 0 Enabled = 0 LPM Remote Wakeup = 0"
    ATTRS{busconnected}=="Bus Connected = 0x1"
    ATTRS{hcddump}=="HCD Dump"
    ATTRS{gotgctl}=="GOTGCTL = 0x001c0001"
    ATTRS{spramdump}=="SPRAM Dump"
    ATTRS{grxfsiz}=="GRXFSIZ = 0x00000306"
    ATTRS{gsnpsid}=="GSNPSID = 0x4f54280a"
    ATTRS{gusbcfg}=="GUSBCFG = 0x20001700"
    ATTRS{hptxfsiz}=="HPTXFSIZ = 0x02000406"
    ATTRS{devspeed}=="Device Speed = 0x0"
    ATTRS{fr_interval}=="Frame Interval = 0x1d4c"
    ATTRS{rem_wakeup_pwrdn}==""
    ATTRS{bussuspend}=="Bus Suspend = 0x0"
    ATTRS{buspower}=="Bus Power = 0x1"
    ATTRS{hnpcapable}=="HNPCapable = 0x1"
    ATTRS{rd_reg_test}=="Time to read GNPTXFSIZ reg 10000000 times: 1890 msecs (189 jiffies)"
    ATTRS{enumspeed}=="Device Enumeration Speed = 0x1"
    ATTRS{inv_sel_hsic}=="Invert Select HSIC = 0x0"
    ATTRS{regoffset}=="0xffffffff"

    looking at parent device '/devices/platform/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS==""
    ATTRS{driver_override}=="(null)"

    looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""

    $ udevadm info --attribute-walk -n /dev/ttyUSB2
    

    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/soc/3f980000.usb/usb1/1-1/1-1.5/1-1.5:1.0/ttyUSB2/tty/ttyUSB2':
    KERNEL=="ttyUSB2"
    SUBSYSTEM=="tty"
    DRIVER==""

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.5/1-1.5:1.0/ttyUSB2':
    KERNELS=="ttyUSB2"
    SUBSYSTEMS=="usb-serial"
    DRIVERS=="ch341-uart"
    ATTRS{port_number}=="0"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.5/1-1.5:1.0':
    KERNELS=="1-1.5:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="ch341"
    ATTRS{bInterfaceClass}=="ff"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{bInterfaceProtocol}=="02"
    ATTRS{bNumEndpoints}=="03"
    ATTRS{authorized}=="1"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.5':
    KERNELS=="1-1.5"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="1.5"
    ATTRS{idVendor}=="1a86"
    ATTRS{speed}=="12"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="8"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="6"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="96mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0254"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 1.10"
    ATTRS{urbnum}=="900734"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="removable"
    ATTRS{idProduct}=="7523"
    ATTRS{bDeviceClass}=="ff"
    ATTRS{product}=="USB2.0-Serial"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="02"
    ATTRS{devpath}=="1"
    ATTRS{idVendor}=="0424"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="2"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="2mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="5"
    ATTRS{bcdDevice}=="0200"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="54"
    ATTRS{ltm_capable}=="no"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="9514"
    ATTRS{bDeviceClass}=="09"

    looking at parent device '/devices/platform/soc/3f980000.usb/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="1"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="1"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bcdDevice}=="0404"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="3f980000.usb"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="25"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 4.4.27-v7+ dwc_otg_hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="DWC OTG Controller"

    looking at parent device '/devices/platform/soc/3f980000.usb':
    KERNELS=="3f980000.usb"
    SUBSYSTEMS=="platform"
    DRIVERS=="dwc_otg"
    ATTRS{hnp}=="HstNegScs = 0x0"
    ATTRS{srp}=="SesReqScs = 0x1"
    ATTRS{regvalue}=="invalid offset"
    ATTRS{hsic_connect}=="HSIC Connect = 0x1"
    ATTRS{guid}=="GUID = 0x2708a000"
    ATTRS{mode}=="Mode = 0x1"
    ATTRS{srpcapable}=="SRPCapable = 0x1"
    ATTRS{regdump}=="Register Dump"
    ATTRS{gpvndctl}=="GPVNDCTL = 0x00000000"
    ATTRS{ggpio}=="GGPIO = 0x00000000"
    ATTRS{hprt0}=="HPRT0 = 0x00001005"
    ATTRS{wr_reg_test}=="Time to write GNPTXFSIZ reg 10000000 times: 680 msecs (68 jiffies)"
    ATTRS{driver_override}=="(null)"
    ATTRS{hcd_frrem}=="HCD Dump Frame Remaining"
    ATTRS{mode_ch_tim_en}=="Mode Change Ready Timer Enable = 0x0"
    ATTRS{gnptxfsiz}=="GNPTXFSIZ = 0x01000306"
    ATTRS{remote_wakeup}=="Remote Wakeup Sig = 0 Enabled = 0 LPM Remote Wakeup = 0"
    ATTRS{busconnected}=="Bus Connected = 0x1"
    ATTRS{hcddump}=="HCD Dump"
    ATTRS{gotgctl}=="GOTGCTL = 0x001c0001"
    ATTRS{spramdump}=="SPRAM Dump"
    ATTRS{grxfsiz}=="GRXFSIZ = 0x00000306"
    ATTRS{gsnpsid}=="GSNPSID = 0x4f54280a"
    ATTRS{gusbcfg}=="GUSBCFG = 0x20001700"
    ATTRS{hptxfsiz}=="HPTXFSIZ = 0x02000406"
    ATTRS{devspeed}=="Device Speed = 0x0"
    ATTRS{fr_interval}=="Frame Interval = 0x1d4c"
    ATTRS{rem_wakeup_pwrdn}==""
    ATTRS{bussuspend}=="Bus Suspend = 0x0"
    ATTRS{buspower}=="Bus Power = 0x1"
    ATTRS{hnpcapable}=="HNPCapable = 0x1"
    ATTRS{rd_reg_test}=="Time to read GNPTXFSIZ reg 10000000 times: 1700 msecs (170 jiffies)"
    ATTRS{enumspeed}=="Device Enumeration Speed = 0x1"
    ATTRS{inv_sel_hsic}=="Invert Select HSIC = 0x0"
    ATTRS{regoffset}=="0xffffffff"

    looking at parent device '/devices/platform/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS==""
    ATTRS{driver_override}=="(null)"

    looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""



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