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0b1b60c7 LV |
1 | README on how reset time on OMAPs should be calculated |
2 | ||
3 | CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC: | |
4 | Most OMAPs' provide a way to specify the time for | |
5 | which the reset should be held low while the voltages | |
6 | and Oscillator outputs stabilize. | |
7 | ||
8 | This time is mostly board and PMIC dependent. Hence the | |
9 | boards are expected to specify a pre-computed time | |
10 | using the above option, (the details on how to compute | |
11 | the value are given below) without which a default time | |
12 | as specified by CONFIG_DEFAULT_OMAP_RESET_TIME_MAX_USEC | |
13 | is used. | |
14 | ||
15 | The value for CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC | |
16 | can be computed using a summation of the below 3 parameters | |
17 | -1- Time taken by the Osciallator to stop and restart | |
18 | -2- PMIC OTP time | |
19 | -3- Voltage ramp time, which can be derived using the | |
20 | PMIC slew rate and value of voltage ramp needed. |