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Documentation: firmware-guide: gpio-properties: active_low only for GpioIo() 

It appears that people may misinterpret active_low field in _DSD
for GpioInt() resource. Add a paragraph to clarify this.

Reported-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Andy Shevchenko 2020-10-29 21:32:42 +02:00 committed by Rafael J. Wysocki
parent 1bd3387979
commit 0d6c41cf80
1 changed files with 3 additions and 0 deletions
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3
Documentation/firmware-guide/acpi/gpio-properties.rst
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@ -55,6 +55,9 @@ Since ACPI GpioIo() resource does not have a field saying whether it is
active low or high, the "active_low" argument can be used here. Setting
it to 1 marks the GPIO as active low.
Note, active_low in _DSD does not make sense for GpioInt() resource and
must be 0. GpioInt() resource has its own means of defining it.
In our Bluetooth example the "reset-gpios" refers to the second GpioIo()
resource, second pin in that resource with the GPIO number of 31.