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      1 /*	$NetBSD: gpio.h,v 1.2 2024/10/31 07:07:45 skrll Exp $	*/
      2 
      3 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
      4 /*
      5  * This header provides constants for most GPIO bindings.
      6  *
      7  * Most GPIO bindings include a flags cell as part of the GPIO specifier.
      8  * In most cases, the format of the flags cell uses the standard values
      9  * defined in this header.
     10  */
     11 
     12 #ifndef _DT_BINDINGS_GPIO_GPIO_H
     13 #define _DT_BINDINGS_GPIO_GPIO_H
     14 
     15 /* Bit 0 express polarity */
     16 #define GPIO_ACTIVE_HIGH 0
     17 #define GPIO_ACTIVE_LOW 1
     18 
     19 /* Bit 1 express single-endedness */
     20 #define GPIO_PUSH_PULL 0
     21 #define GPIO_SINGLE_ENDED 2
     22 
     23 /* Bit 2 express Open drain or open source */
     24 #define GPIO_LINE_OPEN_SOURCE 0
     25 #define GPIO_LINE_OPEN_DRAIN 4
     26 
     27 /*
     28  * Open Drain/Collector is the combination of single-ended open drain interface.
     29  * Open Source/Emitter is the combination of single-ended open source interface.
     30  */
     31 #define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN)
     32 #define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_SOURCE)
     33 
     34 /* Bit 3 express GPIO suspend/resume and reset persistence */
     35 #define GPIO_PERSISTENT 0
     36 #define GPIO_TRANSITORY 8
     37 
     38 /* Bit 4 express pull up */
     39 #define GPIO_PULL_UP 16
     40 
     41 /* Bit 5 express pull down */
     42 #define GPIO_PULL_DOWN 32
     43 
     44 /* Bit 6 express pull disable */
     45 #define GPIO_PULL_DISABLE 64
     46 
     47 #endif
     48