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40 lines
1.2 KiB
40 lines
1.2 KiB
=========================== |
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Samsung GPIO implementation |
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=========================== |
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Introduction |
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------------ |
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This outlines the Samsung GPIO implementation and the architecture |
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specific calls provided alongside the drivers/gpio core. |
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S3C24XX (Legacy) |
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---------------- |
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See Documentation/arm/samsung-s3c24xx/gpio.rst for more information |
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about these devices. Their implementation has been brought into line |
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with the core samsung implementation described in this document. |
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GPIOLIB integration |
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------------------- |
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The gpio implementation uses gpiolib as much as possible, only providing |
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specific calls for the items that require Samsung specific handling, such |
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as pin special-function or pull resistor control. |
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GPIO numbering is synchronised between the Samsung and gpiolib system. |
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PIN configuration |
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----------------- |
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Pin configuration is specific to the Samsung architecture, with each SoC |
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registering the necessary information for the core gpio configuration |
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implementation to configure pins as necessary. |
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The s3c_gpio_cfgpin() and s3c_gpio_setpull() provide the means for a |
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driver or machine to change gpio configuration. |
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See arch/arm/mach-s3c/gpio-cfg.h for more information on these functions.
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