Definition of the GPIO API (for usage in u-boot source) in u-boot sources

Technical Support
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1

I can’t find the usual GPIO API functions like gpio_request(...) available for use within u-boot source code (e.g. in the board file board/toradex/apalis-tk1/apalis-tk1.c for use in “board_init” function etc., the board file references #include <asm/gpio.h> → arch/arm/include/asm/gpio.h → arch/arm/include/asm/arch-tegra124/gpio.h). Where can I find the header file which specifies the available API for the TK1?

2

Where can I find the header file which specifies the available API for the TK1?

U-Boot GPIO API is generic, have a look at this.