README.omap-reset-time 811 B

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  1. README on how reset time on OMAPs should be calculated
  2. CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC:
  3. Most OMAPs' provide a way to specify the time for
  4. which the reset should be held low while the voltages
  5. and Oscillator outputs stabilize.
  6. This time is mostly board and PMIC dependent. Hence the
  7. boards are expected to specify a pre-computed time
  8. using the above option, (the details on how to compute
  9. the value are given below) without which a default time
  10. as specified by CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC
  11. is used.
  12. The value for CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC
  13. can be computed using a summation of the below 3 parameters
  14. -1- Time taken by the Osciallator to stop and restart
  15. -2- PMIC OTP time
  16. -3- Voltage ramp time, which can be derived using the
  17. PMIC slew rate and value of voltage ramp needed.