u-boot/include/dt-bindings/gpio/gpio.h

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/*
* This header provides constants for most GPIO bindings.
*
* Most GPIO bindings include a flags cell as part of the GPIO specifier.
* In most cases, the format of the flags cell uses the standard values
* defined in this header.
*/
#ifndef _DT_BINDINGS_GPIO_GPIO_H
#define _DT_BINDINGS_GPIO_GPIO_H
#define GPIO_ACTIVE_HIGH 0
#define GPIO_ACTIVE_LOW 1
#endif