1		Samsung GPIO implementation
2		===========================
3
4Introduction
5------------
6
7This outlines the Samsung GPIO implementation and the architecture
8specific calls provided alongside the drivers/gpio core.
9
10
11S3C24XX (Legacy)
12----------------
13
14See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information
15about these devices. Their implementation has been brought into line
16with the core samsung implementation described in this document.
17
18
19GPIOLIB integration
20-------------------
21
22The gpio implementation uses gpiolib as much as possible, only providing
23specific calls for the items that require Samsung specific handling, such
24as pin special-function or pull resistor control.
25
26GPIO numbering is synchronised between the Samsung and gpiolib system.
27
28
29PIN configuration
30-----------------
31
32Pin configuration is specific to the Samsung architecture, with each SoC
33registering the necessary information for the core gpio configuration
34implementation to configure pins as necessary.
35
36The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a
37driver or machine to change gpio configuration.
38
39See arch/arm/plat-samsung/include/plat/gpio-cfg.h for more information
40on these functions.
41