include/clk-uclass.h

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  * Copyright (c) 2016, NVIDIA CORPORATION.
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #ifndef _CLK_UCLASS_H
  10 #define _CLK_UCLASS_H
  11
  12 /* See clk.h for background documentation. */
  13
  14 #include <clk.h>
  15
  16 struct ofnode_phandle_args;
  17
  18 /**
  19  * struct clk_ops - The functions that a clock driver must implement.
  20  */
  21 struct clk_ops {
  22         /**
  23          * of_xlate - Translate a client's device-tree (OF) clock specifier.
  24          *
  25          * The clock core calls this function as the first step in implementing
  26          * a client's clk_get_by_*() call.
  27          *
  28          * If this function pointer is set to NULL, the clock core will use a
  29          * default implementation, which assumes #clock-cells = <1>, and that
  30          * the DT cell contains a simple integer clock ID.
  31          *
  32          * At present, the clock API solely supports device-tree. If this
  33          * changes, other xxx_xlate() functions may be added to support those
  34          * other mechanisms.
  35          *
  36          * @clock:      The clock struct to hold the translation result.
  37          * @args:       The clock specifier values from device tree.
  38          * @return 0 if OK, or a negative error code.
  39          */
  40         int (*of_xlate)(struct clk *clock,
  41                         struct ofnode_phandle_args *args);
  42         /**
  43          * request - Request a translated clock.
  44          *
  45          * The clock core calls this function as the second step in
  46          * implementing a client's clk_get_by_*() call, following a successful
  47          * xxx_xlate() call, or as the only step in implementing a client's
  48          * clk_request() call.
  49          *
  50          * @clock:      The clock struct to request; this has been fille in by
  51          *              a previoux xxx_xlate() function call, or by the caller
  52          *              of clk_request().
  53          * @return 0 if OK, or a negative error code.
  54          */
  55         int (*request)(struct clk *clock);
  56         /**
  57          * free - Free a previously requested clock.
  58          *
  59          * This is the implementation of the client clk_free() API.
  60          *
  61          * @clock:      The clock to free.
  62          * @return 0 if OK, or a negative error code.
  63          */
  64         int (*free)(struct clk *clock);
  65         /**
  66          * get_rate() - Get current clock rate.
  67          *
  68          * @clk:        The clock to query.
  69          * @return clock rate in Hz, or -ve error code
  70          */
  71         ulong (*get_rate)(struct clk *clk);
  72         /**
  73          * set_rate() - Set current clock rate.
  74          *
  75          * @clk:        The clock to manipulate.
  76          * @rate:       New clock rate in Hz.
  77          * @return new rate, or -ve error code.
  78          */
  79         ulong (*set_rate)(struct clk *clk, ulong rate);
  80         /**
  81          * set_parent() - Set current clock parent
  82          *
  83          * @clk:        The clock to manipulate.
  84          * @parent:     New clock parent.
  85          * @return zero on success, or -ve error code.
  86          */
  87         int (*set_parent)(struct clk *clk, struct clk *parent);
  88         /**
  89          * enable() - Enable a clock.
  90          *
  91          * @clk:        The clock to manipulate.
  92          * @return zero on success, or -ve error code.
  93          */
  94         int (*enable)(struct clk *clk);
  95         /**
  96          * disable() - Disable a clock.
  97          *
  98          * @clk:        The clock to manipulate.
  99          * @return zero on success, or -ve error code.
 100          */
 101         int (*disable)(struct clk *clk);
 102 };
 103
 104 #endif