include/reset-uclass.h

   1 /*
   2  * Copyright (c) 2016, NVIDIA CORPORATION.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0
   5  */
   6
   7 #ifndef _RESET_UCLASS_H
   8 #define _RESET_UCLASS_H
   9
  10 /* See reset.h for background documentation. */
  11
  12 #include <reset.h>
  13
  14 struct ofnode_phandle_args;
  15 struct udevice;
  16
  17 /**
  18  * struct reset_ops - The functions that a reset controller driver must
  19  * implement.
  20  */
  21 struct reset_ops {
  22         /**
  23          * of_xlate - Translate a client's device-tree (OF) reset specifier.
  24          *
  25          * The reset core calls this function as the first step in implementing
  26          * a client's reset_get_by_*() call.
  27          *
  28          * If this function pointer is set to NULL, the reset core will use a
  29          * default implementation, which assumes #reset-cells = <1>, and that
  30          * the DT cell contains a simple integer reset signal ID.
  31          *
  32          * At present, the reset API solely supports device-tree. If this
  33          * changes, other xxx_xlate() functions may be added to support those
  34          * other mechanisms.
  35          *
  36          * @reset_ctl:  The reset control struct to hold the translation result.
  37          * @args:       The reset specifier values from device tree.
  38          * @return 0 if OK, or a negative error code.
  39          */
  40         int (*of_xlate)(struct reset_ctl *reset_ctl,
  41                         struct ofnode_phandle_args *args);
  42         /**
  43          * request - Request a translated reset control.
  44          *
  45          * The reset core calls this function as the second step in
  46          * implementing a client's reset_get_by_*() call, following a
  47          * successful xxx_xlate() call.
  48          *
  49          * @reset_ctl:  The reset control struct to request; this has been
  50          *              filled in by a previoux xxx_xlate() function call.
  51          * @return 0 if OK, or a negative error code.
  52          */
  53         int (*request)(struct reset_ctl *reset_ctl);
  54         /**
  55          * free - Free a previously requested reset control.
  56          *
  57          * This is the implementation of the client reset_free() API.
  58          *
  59          * @reset_ctl:  The reset control to free.
  60          * @return 0 if OK, or a negative error code.
  61          */
  62         int (*free)(struct reset_ctl *reset_ctl);
  63         /**
  64          * rst_assert - Assert a reset signal.
  65          *
  66          * Note: This function is named rst_assert not assert to avoid
  67          * conflicting with global macro assert().
  68          *
  69          * @reset_ctl:  The reset signal to assert.
  70          * @return 0 if OK, or a negative error code.
  71          */
  72         int (*rst_assert)(struct reset_ctl *reset_ctl);
  73         /**
  74          * rst_deassert - Deassert a reset signal.
  75          *
  76          * @reset_ctl:  The reset signal to deassert.
  77          * @return 0 if OK, or a negative error code.
  78          */
  79         int (*rst_deassert)(struct reset_ctl *reset_ctl);
  80 };
  81
  82 #endif