1 Samsung GPIO implementation
2 ===========================
7 This outlines the Samsung GPIO implementation and the architecture
8 specific calls provided alongisde the drivers/gpio core.
14 See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information
15 about these devices. Their implementation is being brought into line
16 with the core samsung implementation described in this document.
22 The gpio implementation uses gpiolib as much as possible, only providing
23 specific calls for the items that require Samsung specific handling, such
24 as pin special-function or pull resistor control.
26 GPIO numbering is synchronised between the Samsung and gpiolib system.
32 Pin configuration is specific to the Samsung architecutre, with each SoC
33 registering the necessary information for the core gpio configuration
34 implementation to configure pins as necessary.
36 The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a
37 driver or machine to change gpio configuration.
39 See arch/arm/plat-samsung/include/plat/gpio-cfg.h for more information