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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-10-29 21:32:42 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2020-11-09 18:59:43 +0100 |
| commit | 0d6c41cf801fd56b92f4359374667061d27a6472 (patch) | |
| tree | e0576f1d823469ab9887da41ade463ea5571528e /Documentation | |
| parent | 1bd3387979bff49cb3115c497895d78ffd5092e3 (diff) | |
| download | linux-0d6c41cf801fd56b92f4359374667061d27a6472.tar.gz linux-0d6c41cf801fd56b92f4359374667061d27a6472.tar.bz2 linux-0d6c41cf801fd56b92f4359374667061d27a6472.zip | |
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>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/firmware-guide/acpi/gpio-properties.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/firmware-guide/acpi/gpio-properties.rst b/Documentation/firmware-guide/acpi/gpio-properties.rst index e6e65ceb2ca1..370fe46c6af9 100644 --- a/Documentation/firmware-guide/acpi/gpio-properties.rst +++ b/Documentation/firmware-guide/acpi/gpio-properties.rst @@ -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. |