include/power-domain-uclass.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2016, NVIDIA CORPORATION.
   4  */
   5
   6 #ifndef _POWER_DOMAIN_UCLASS_H
   7 #define _POWER_DOMAIN_UCLASS_H
   8
   9 /* See power-domain.h for background documentation. */
  10
  11 #include <power-domain.h>
  12
  13 struct udevice;
  14
  15 /**
  16  * struct power_domain_ops - The functions that a power domain controller driver
  17  * must implement.
  18  */
  19 struct power_domain_ops {
  20         /**
  21          * of_xlate - Translate a client's device-tree (OF) power domain
  22          * specifier.
  23          *
  24          * The power domain core calls this function as the first step in
  25          * implementing a client's power_domain_get() call.
  26          *
  27          * If this function pointer is set to NULL, the power domain core will
  28          * use a default implementation, which assumes #power-domain-cells =
  29          * <1>, and that the DT cell contains a simple integer power domain ID.
  30          *
  31          * At present, the power domain API solely supports device-tree. If
  32          * this changes, other xxx_xlate() functions may be added to support
  33          * those other mechanisms.
  34          *
  35          * @power_domain:       The power domain struct to hold the
  36          *                      translation result.
  37          * @args:               The power domain specifier values from device
  38          *                      tree.
  39          * @return 0 if OK, or a negative error code.
  40          */
  41         int (*of_xlate)(struct power_domain *power_domain,
  42                         struct ofnode_phandle_args *args);
  43         /**
  44          * request - Request a translated power domain.
  45          *
  46          * The power domain core calls this function as the second step in
  47          * implementing a client's power_domain_get() call, following a
  48          * successful xxx_xlate() call.
  49          *
  50          * @power_domain:       The power domain to request; this has been
  51          *                      filled in by a previous xxx_xlate() function
  52          *                      call.
  53          * @return 0 if OK, or a negative error code.
  54          */
  55         int (*request)(struct power_domain *power_domain);
  56         /**
  57          * rfree - Free a previously requested power domain.
  58          *
  59          * This is the implementation of the client power_domain_free() API.
  60          *
  61          * @power_domain:       The power domain to free.
  62          * @return 0 if OK, or a negative error code.
  63          */
  64         int (*rfree)(struct power_domain *power_domain);
  65         /**
  66          * on - Power on a power domain.
  67          *
  68          * @power_domain:       The power domain to turn on.
  69          * @return 0 if OK, or a negative error code.
  70          */
  71         int (*on)(struct power_domain *power_domain);
  72         /**
  73          * off - Power off a power domain.
  74          *
  75          * @power_domain:       The power domain to turn off.
  76          * @return 0 if OK, or a negative error code.
  77          */
  78         int (*off)(struct power_domain *power_domain);
  79 };
  80
  81 #endif