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ARM: SAMSUNG: Documentation: add documentation on GPIO code

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Add some documentation in Documentation/arm/Samsung for the GPIO code
and where to look for the necessary functions. Update the S3C24XX case
as well.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2010-05-24 12:13:30 +09:00
parent 9414392678
commit d192baeaa7
3 changed files with 48 additions and 0 deletions
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2
Documentation/arm/Samsung-S3C24XX/GPIO.txt
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@ -12,6 +12,8 @@ Introduction
of the s3c2410 GPIO system, please read the Samsung provided of the s3c2410 GPIO system, please read the Samsung provided
data-sheet/users manual to find out the complete list. data-sheet/users manual to find out the complete list.
See Documentation/arm/Samsung/GPIO.txt for the core implemetation.
GPIOLIB GPIOLIB
------- -------

4
Documentation/arm/Samsung-S3C24XX/Overview.txt
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@ -218,6 +218,10 @@ GPIO
As of v2.6.34, the move towards using gpiolib support is almost As of v2.6.34, the move towards using gpiolib support is almost
complete, and very little of the old calls are left. complete, and very little of the old calls are left.
See Documentation/arm/Samsung-S3C24XX/GPIO.txt for the S3C24XX specific
support and Documentation/arm/Samsung/GPIO.txt for the core Samsung
implementation.
Clock Management Clock Management
---------------- ----------------

42
Documentation/arm/Samsung/GPIO.txt Normal file
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@ -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.