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author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2016-10-21 17:21:30 +0300 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2016-10-24 16:33:11 +0200 |
commit | c80f1ba75df25837fb76044e06686b6587d33f6a (patch) | |
tree | f39b7fd7795bf25d0d6f19df7a86b57b667c0f06 /Documentation/acpi | |
parent | 6f7194a10bdba1588357342c6daaaeef98e0004f (diff) | |
download | op-kernel-dev-c80f1ba75df25837fb76044e06686b6587d33f6a.zip op-kernel-dev-c80f1ba75df25837fb76044e06686b6587d33f6a.tar.gz |
ACPI / gpio: Add hogging support
GPIO hogging means that the GPIO controller can "hog" and configure certain
GPIOs without need for a driver or userspace to do that. This is useful in
open-connected boards where BIOS cannot possibly know beforehand which
devices will be connected to the board.
This adds GPIO hogging mechanism to ACPI analogous to Device Tree.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/acpi')
-rw-r--r-- | Documentation/acpi/gpio-properties.txt | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/acpi/gpio-properties.txt b/Documentation/acpi/gpio-properties.txt index 09cff65..d9076af 100644 --- a/Documentation/acpi/gpio-properties.txt +++ b/Documentation/acpi/gpio-properties.txt @@ -66,6 +66,41 @@ native: } } +Other supported properties +-------------------------- + +Following Device Tree compatible device properties are also supported by +_DSD device properties for GPIO controllers: + +- gpio-hog +- output-high +- output-low +- input +- line-name + +Example: + + Name (_DSD, Package () { + // _DSD Hierarchical Properties Extension UUID + ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"), + Package () { + Package () {"hog-gpio8", "G8PU"} + } + }) + + Name (G8PU, Package () { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package () {"gpio-hog", 1}, + Package () {"gpios", Package () {8, 0}}, + Package () {"output-high", 1}, + Package () {"line-name", "gpio8-pullup"}, + } + }) + +See Documentation/devicetree/bindings/gpio/gpio.txt for more information +about these properties. + ACPI GPIO Mappings Provided by Drivers -------------------------------------- |