Release 4.13 include/dt-bindings/gpio/gpio.h

/*
 * 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

/* Bit 0 express polarity */

#define GPIO_ACTIVE_HIGH 0

#define GPIO_ACTIVE_LOW 1

/* Bit 1 express single-endedness */

#define GPIO_PUSH_PULL 0

#define GPIO_SINGLE_ENDED 2

/* Bit 2 express Open drain or open source */

#define GPIO_LINE_OPEN_SOURCE 0

#define GPIO_LINE_OPEN_DRAIN 4

/*
 * Open Drain/Collector is the combination of single-ended open drain interface.
 * Open Source/Emitter is the combination of single-ended open source interface.
 */

#define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)

#define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)

/* Bit 3 express GPIO suspend/resume persistence */

#define GPIO_SLEEP_MAINTAIN_VALUE 0

#define GPIO_SLEEP_MAY_LOOSE_VALUE 8

#endif
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Directory: include/dt-bindings/gpio

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