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| -rw-r--r-- | Documentation/arm/samsung/gpio.rst | 40 |
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diff --git a/Documentation/arm/samsung/gpio.rst b/Documentation/arm/samsung/gpio.rst new file mode 100644 index 000000000..f6e27b07c --- /dev/null +++ b/Documentation/arm/samsung/gpio.rst @@ -0,0 +1,40 @@ +=========================== +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.rst 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/mach-s3c/gpio-cfg.h for more information on these functions. |