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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-11-03 23:39:57 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-11-04 21:58:24 +0100 |
| commit | e36d453e98c57dda0f8ba68585676ac4ba36631e (patch) | |
| tree | ee07de9e62c83b1c00dee07f7d953a2695659795 /Documentation/gpio | |
| parent | 72daceb9a10af4614d4aee304f07904191962f07 (diff) | |
| download | lwn-e36d453e98c57dda0f8ba68585676ac4ba36631e.tar.gz lwn-e36d453e98c57dda0f8ba68585676ac4ba36631e.zip | |
ACPI / GPIO: Document ACPI GPIO mappings API
Document the previously introduced method that can be used by device
drivers to provide the GPIO subsystem with mappings between GPIO names
(connection IDs) and GpioIo()/GpioInt() resources in _CRS.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'Documentation/gpio')
| -rw-r--r-- | Documentation/gpio/consumer.txt | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/gpio/consumer.txt b/Documentation/gpio/consumer.txt index 6ce544191ca6..859918db36b8 100644 --- a/Documentation/gpio/consumer.txt +++ b/Documentation/gpio/consumer.txt @@ -219,6 +219,24 @@ part of the IRQ interface, e.g. IRQF_TRIGGER_FALLING, as are system wakeup capabilities. +GPIOs and ACPI +============== + +On ACPI systems, GPIOs are described by GpioIo()/GpioInt() resources listed by +the _CRS configuration objects of devices. Those resources do not provide +connection IDs (names) for GPIOs, so it is necessary to use an additional +mechanism for this purpose. + +Systems compliant with ACPI 5.1 or newer may provide a _DSD configuration object +which, among other things, may be used to provide connection IDs for specific +GPIOs described by the GpioIo()/GpioInt() resources in _CRS. If that is the +case, it will be handled by the GPIO subsystem automatically. However, if the +_DSD is not present, the mappings between GpioIo()/GpioInt() resources and GPIO +connection IDs need to be provided by device drivers. + +For details refer to Documentation/acpi/gpio-properties.txt + + Interacting With the Legacy GPIO Subsystem ========================================== Many kernel subsystems still handle GPIOs using the legacy integer-based |