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| author | Bastien Curutchet <bastien.curutchet@bootlin.com> | 2024-04-05 14:05:52 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-09 15:51:19 +0200 |
| commit | 32f6ec282fb0ddb45da1a19145ef9eeef088968d (patch) | |
| tree | 84ee3b6005b730ed18787c8c986421655db2e85f /tools/perf/scripts/python/syscall-counts.py | |
| parent | 8c278ade67bdcd9882d32547015a091fb16132b1 (diff) | |
serial: 8250_of: Add clock_notifier
The UART's input clock rate can change at runtime but this is not
handled by the driver.
Add a clock_notifier callback that updates the divisors when the input
clock is updated. The serial8250_update_uartclk() is used to do so.
PRE_RATE_CHANGE and ABORT_RATE_CHANGE notifications are ignored, only
the POST_RATE_CHANGE is used. Not using PRE_RATE_CHANGE notification can
result in a few corrupted bytes during frequency transitions but, IMHO,
it can be acceptable in many use cases.
It has been tested on a DAVINCI/OMAP-L138 processor.
Signed-off-by: Bastien Curutchet <bastien.curutchet@bootlin.com>
Reviewed-by: Herve Codina <herve.codina@bootlin.com>
Link: https://lore.kernel.org/r/20240405120552.35991-1-bastien.curutchet@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions