From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- Documentation/arch/arm/samsung/gpio.rst | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 Documentation/arch/arm/samsung/gpio.rst (limited to 'Documentation/arch/arm/samsung/gpio.rst') diff --git a/Documentation/arch/arm/samsung/gpio.rst b/Documentation/arch/arm/samsung/gpio.rst new file mode 100644 index 0000000000..27fae0d503 --- /dev/null +++ b/Documentation/arch/arm/samsung/gpio.rst @@ -0,0 +1,32 @@ +=========================== +Samsung GPIO implementation +=========================== + +Introduction +------------ + +This outlines the Samsung GPIO implementation and the architecture +specific calls provided alongside the drivers/gpio core. + + +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. -- cgit v1.2.3