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author | Paul Mundt <lethal@linux-sh.org> | 2010-05-31 12:59:19 +0900 |
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committer | Paul Mundt <lethal@linux-sh.org> | 2010-05-31 12:59:19 +0900 |
commit | 8fa76f7e61ef4e5bc97207143ea4e198b22487bc (patch) | |
tree | 266c42b6687e68e4febb72d8c031e5facd899a1c /Documentation/arm/Samsung/GPIO.txt | |
parent | a41a7b91772da2c77ac0da74285fd8ebd86a85ba (diff) | |
parent | 67a3e12b05e055c0415c556a315a3d3eb637e29e (diff) | |
download | blackbird-op-linux-8fa76f7e61ef4e5bc97207143ea4e198b22487bc.tar.gz blackbird-op-linux-8fa76f7e61ef4e5bc97207143ea4e198b22487bc.zip |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
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. + + |