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