gpio.h

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    1 /* SPDX-License-Identifier: GPL-2.0 */
    2 /*
    3  * This header provides constants for most GPIO bindings.
    4  *
    5  * Most GPIO bindings include a flags cell as part of the GPIO specifier.
    6  * In most cases, the format of the flags cell uses the standard values
    7  * defined in this header.
    8  */
    9 
   10 #ifndef _DT_BINDINGS_GPIO_GPIO_H
   11 #define _DT_BINDINGS_GPIO_GPIO_H
   12 
   13 /* Bit 0 express polarity */
   14 #define GPIO_ACTIVE_HIGH 0
   15 #define GPIO_ACTIVE_LOW 1
   16 
   17 /* Bit 1 express single-endedness */
   18 #define GPIO_PUSH_PULL 0
   19 #define GPIO_SINGLE_ENDED 2
   20 
   21 /* Bit 2 express Open drain or open source */
   22 #define GPIO_LINE_OPEN_SOURCE 0
   23 #define GPIO_LINE_OPEN_DRAIN 4
   24 
   25 /*
   26  * Open Drain/Collector is the combination of single-ended open drain interface.
   27  * Open Source/Emitter is the combination of single-ended open source interface.
   28  */
   29 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)
   30 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)
   31 
   32 /* Bit 3 express GPIO suspend/resume and reset persistence */
   33 #define GPIO_PERSISTENT 0
   34 #define GPIO_TRANSITORY 8
   35 
   36 /* Bit 4 express pull up */
   37 #define GPIO_PULL_UP 16
   38 
   39 /* Bit 5 express pull down */
   40 #define GPIO_PULL_DOWN 32
   41 
   42 /* Bit 6 express pull disable */
   43 #define GPIO_PULL_DISABLE 64
   44 
   45 #endif

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/include/dt-bindings/gpio/gpio.h

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/include/dt-bindings/gpio/gpio.h