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Commit d192baea authored by Ben Dooks's avatar Ben Dooks
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ARM: SAMSUNG: Documentation: add documentation on GPIO code 



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: default avatarBen Dooks <ben-linux@fluff.org>
parent 94143926

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

  data-sheet/users manual to find out the complete list.



  See Documentation/arm/Samsung/GPIO.txt for the core implemetation.





GPIOLIB

-------

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

  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

----------------

Documentation/arm/Samsung/GPIO.txt

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		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.