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Documentation / arm / Samsung / GPIO.txt




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Based on kernel version 3.13. Page generated on 2014-01-20 22:00 EST.

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