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gpio: add flags to export GPIOs when requesting

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Introduce new flags to automatically export GPIOs when using the convenience
functions gpio_request_one() or gpio_request_array(). This eases support for
custom boards where lots of GPIOs need to be exported for customer
applications.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Wolfram Sang
2011-12-13 18:34:01 +01:00
committed by Grant Likely
parent dd775ae254
commit fc3a1f04f5
3 changed files with 19 additions and 1 deletions
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Documentation/gpio.txt
+3
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@@ -322,6 +322,9 @@ where 'flags' is currently defined to specify the following properties:
* GPIOF_OPEN_DRAIN - gpio pin is open drain type.
* GPIOF_OPEN_SOURCE - gpio pin is open source type.
* GPIOF_EXPORT_DIR_FIXED - export gpio to sysfs, keep direction
* GPIOF_EXPORT_DIR_CHANGEABLE - also export, allow changing direction
since GPIOF_INIT_* are only valid when configured as output, so group valid
combinations as: