| =========================== |
| Samsung GPIO implementation |
| =========================== |
| |
| Introduction |
| ------------ |
| |
| This outlines the Samsung GPIO implementation and the architecture |
| specific calls provided alongside the drivers/gpio core. |
| |
| |
| S3C24XX (Legacy) |
| ---------------- |
| |
| See Documentation/arm/samsung-s3c24xx/gpio.rst for more information |
| about these devices. Their implementation has been 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 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/mach-s3c/gpio-cfg.h for more information on these functions. |
