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author | Michal Marek <mmarek@suse.cz> | 2010-08-04 14:05:07 +0200 |
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committer | Michal Marek <mmarek@suse.cz> | 2010-08-04 14:05:07 +0200 |
commit | 7a996d3ab150bb0e1b71fa182f70199a703efdd1 (patch) | |
tree | 96a36947d90c9b96580899abd38cb3b70cd9d40b /Documentation/arm/Samsung/GPIO.txt | |
parent | 7cf3d73b4360e91b14326632ab1aeda4cb26308d (diff) | |
parent | 9fe6206f400646a2322096b56c59891d530e8d51 (diff) | |
download | blackbird-op-linux-7a996d3ab150bb0e1b71fa182f70199a703efdd1.tar.gz blackbird-op-linux-7a996d3ab150bb0e1b71fa182f70199a703efdd1.zip |
Merge commit 'v2.6.35' into kbuild/kconfig
Conflicts:
scripts/kconfig/Makefile
Diffstat (limited to 'Documentation/arm/Samsung/GPIO.txt')
-rw-r--r-- | Documentation/arm/Samsung/GPIO.txt | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/Documentation/arm/Samsung/GPIO.txt b/Documentation/arm/Samsung/GPIO.txt new file mode 100644 index 000000000000..05850c62abeb --- /dev/null +++ b/Documentation/arm/Samsung/GPIO.txt @@ -0,0 +1,42 @@ + Samsung GPIO implementation + =========================== + +Introduction +------------ + +This outlines the Samsung GPIO implementation and the architecture +specfic calls provided alongisde the drivers/gpio core. + + +S3C24XX (Legacy) +---------------- + +See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information +about these devices. Their implementation is being brought into line +with the core samsung implementation described in this document. + + +GPIOLIB integration +------------------- + +The gpio implementation uses gpiolib as much as possible, only providing +specific calls for the items that require Samsung specific handling, such +as pin special-function or pull resistor control. + +GPIO numbering is synchronised between the Samsung and gpiolib system. + + +PIN configuration +----------------- + +Pin configuration is specific to the Samsung architecutre, with each SoC +registering the necessary information for the core gpio configuration +implementation to configure pins as necessary. + +The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a +driver or machine to change gpio configuration. + +See arch/arm/plat-samsung/include/plat/gpio-cfg.h for more information +on these functions. + + |