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- 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.txt 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/plat-samsung/include/plat/gpio-cfg.h for more information
- on these functions.
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