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authorWolfram Sang <w.sang@pengutronix.de>2011-12-13 18:34:01 +0100
committerGrant Likely <grant.likely@secretlab.ca>2012-04-05 21:24:06 -0700
commitfc3a1f04f5040255cbc086c419e4237f29f89f88 (patch)
tree3ece85d636a3ceeffb157b77ee51b4745cbdf2d9 /Documentation
parentdd775ae2549217d3ae09363e3edb305d0fa19928 (diff)
downloadop-kernel-dev-fc3a1f04f5040255cbc086c419e4237f29f89f88.zip
op-kernel-dev-fc3a1f04f5040255cbc086c419e4237f29f89f88.tar.gz
gpio: add flags to export GPIOs when requesting
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/gpio.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index 620a078..e08a883 100644
--- a/Documentation/gpio.txt
+++ b/Documentation/gpio.txt
@@ -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:
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