usb address in imx7ulp and imx7d

[asmaa]

Hello All,

 First of all sorry if my question is silly,but I am trying to understand android build process. So, When I checked fstab.freescale for 7ulp evk and sabresd_7d I found following difference in the file.

evk -7ulp

/devices/platform/40000000.ahb-bridge0/40330000.usb/ci_hdrc.0* auto auto defaults voldmanaged=usb:auto

sabresd-7d

/devices/soc0/soc/30800000.aips-bus/30b20000.usb/ci_hdrc.1* auto auto defaults voldmanaged=usb:auto

After reading some documentation I understand 40000000.ahb-bridge0/40330000.usb & 30800000.aips-bus/30b20000.usb are the usb otg addresses as given in device tree.

but what I dont understand is: 

1. /devices/platform/ in 7ulp and /devices/soc0/soc/ in sabresd_7d

why there is no platform in 7d and extra soc0?

2. usb/ci_hdrc.0 & usb/ci_hdrc.1

why is this difference of 1 and 0 in the files?

can someone please explain me this difference. Your help would be much appreciated.

Regards,

Asma

[igorpadykov · Accepted solution]

Hi Asma

1. difference between /devices/platform/  /devices/soc can be found in linux documentation

https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-devices-soc 

2. i.mx7d has 2x usb otg modules while i.mx7ulp one.

Best regards
igor
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