diff options
| -rw-r--r-- | Documentation/arm/Samsung-S3C24XX/GPIO.txt | 2 | ||||
| -rw-r--r-- | Documentation/arm/Samsung-S3C24XX/Overview.txt | 4 | ||||
| -rw-r--r-- | Documentation/arm/Samsung/GPIO.txt | 42 |
3 files changed, 48 insertions, 0 deletions
diff --git a/Documentation/arm/Samsung-S3C24XX/GPIO.txt b/Documentation/arm/Samsung-S3C24XX/GPIO.txt index 228ecb61d2f..816d6071669 100644 --- a/Documentation/arm/Samsung-S3C24XX/GPIO.txt +++ b/Documentation/arm/Samsung-S3C24XX/GPIO.txt @@ -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 ------- diff --git a/Documentation/arm/Samsung-S3C24XX/Overview.txt b/Documentation/arm/Samsung-S3C24XX/Overview.txt index 0f11fcc1d51..c12bfc1a00c 100644 --- a/Documentation/arm/Samsung-S3C24XX/Overview.txt +++ b/Documentation/arm/Samsung-S3C24XX/Overview.txt @@ -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 ---------------- diff --git a/Documentation/arm/Samsung/GPIO.txt b/Documentation/arm/Samsung/GPIO.txt new file mode 100644 index 00000000000..05850c62abe --- /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. + + |