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1 | Samsung GPIO implementation |
2 | =========================== | |
3 | ||
4 | Introduction | |
5 | ------------ | |
6 | ||
7 | This outlines the Samsung GPIO implementation and the architecture | |
98025c8c | 8 | specific calls provided alongside the drivers/gpio core. |
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9 | |
10 | ||
11 | S3C24XX (Legacy) | |
12 | ---------------- | |
13 | ||
14 | See Documentation/arm/Samsung-S3C24XX/GPIO.txt for more information | |
98025c8c | 15 | about these devices. Their implementation has been brought into line |
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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 | ||
98025c8c | 32 | Pin configuration is specific to the Samsung architecture, with each SoC |
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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. |