| Samsung GPIO implementation |
| =========================== |
| This outlines the Samsung GPIO implementation and the architecture |
| specific calls provided alongside the drivers/gpio core. |
| See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information |
| about these devices. Their implementation has been brought into line |
| with the core samsung implementation described in this document. |
| 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 is specific to the Samsung architecture, 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 |