pad configuration register doubt

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Hi all,
  In the arch/arm/mach-omap2/mux.c file. i have some doubts of the
structure omap34xx_pins. What is the difference between pullup/pulldown
selection and pullup enable bits in the pad  configuration register
of omap 3430 processor. any help on the different bits in the control
pad configuration register.  why and where they are used. what is the
meaning of input enable or offmode bits and why it is needed.

With Warm Regards,
 chandru
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