diff options
| author | Guenter Roeck <[email protected]> | 2014-07-21 11:12:16 -0700 |
|---|---|---|
| committer | Linus Walleij <[email protected]> | 2014-07-23 17:31:57 +0200 |
| commit | 2be001739242fac1083f3b21898158492844699d (patch) | |
| tree | f9f3564e20cd82eea5c0b27b0155dff51f24b365 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/SchedGui.py | |
| parent | 190dc2e6844ad8a47838207cbe739c94d88d94cd (diff) | |
gpio: Add support for GPIOF_ACTIVE_LOW to gpio_request_one functions
The gpio include file and the gpio documentation declare and document
GPIOF_ACTIVE_LOW as one of the flags to be passed to gpio_request_one
and related functions. However, the flag is not evaluated or used.
This can cause problems in at least two areas: First, the same API can
be used to auto-export pins to user space. The missing support for
GPIOF_ACTIVE_LOW results in unexpected behavior for such auto-exported
pins. Second, the requested gpio pin can be convered for use by
gpiod functions with gpio_to_desc(). While gpio API functions do not
support GPIOF_ACTIVE_LOW, gpiod functions do, which again results in
unexpected behavior.
Check the flag in gpio_request_one and set the gpio internal flag
FLAG_ACTIVE_LOW if it is set to address those problems.
Signed-off-by: Guenter Roeck <[email protected]>
Reviewed-by: Alexandre Courbot <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/SchedGui.py')
0 files changed, 0 insertions, 0 deletions