include/linux/pinctrl/machine.h

   1 /*
   2  * Machine interface for the pinctrl subsystem.
   3  *
   4  * Copyright (C) 2011 ST-Ericsson SA
   5  * Written on behalf of Linaro for ST-Ericsson
   6  * Based on bits of regulator core, gpio core and clk core
   7  *
   8  * Author: Linus Walleij <linus.walleij@linaro.org>
   9  *
  10  * License terms: GNU General Public License (GPL) version 2
  11  */
  12 #ifndef __LINUX_PINMUX_MACHINE_H
  13 #define __LINUX_PINMUX_MACHINE_H
  14
  15 /**
  16  * struct pinmux_map - boards/machines shall provide this map for devices
  17  * @name: the name of this specific map entry for the particular machine.
  18  *      This is the second parameter passed to pinmux_get() when you want
  19  *      to have several mappings to the same device
  20  * @ctrl_dev: the pin control device to be used by this mapping, may be NULL
  21  *      if you provide .ctrl_dev_name instead (this is more common)
  22  * @ctrl_dev_name: the name of the device controlling this specific mapping,
  23  *      the name must be the same as in your struct device*, may be NULL if
  24  *      you provide .ctrl_dev instead
  25  * @function: a function in the driver to use for this mapping, the driver
  26  *      will lookup the function referenced by this ID on the specified
  27  *      pin control device
  28  * @group: sometimes a function can map to different pin groups, so this
  29  *      selects a certain specific pin group to activate for the function, if
  30  *      left as NULL, the first applicable group will be used
  31  * @dev: the device using this specific mapping, may be NULL if you provide
  32  *      .dev_name instead (this is more common)
  33  * @dev_name: the name of the device using this specific mapping, the name
  34  *      must be the same as in your struct device*, may be NULL if you
  35  *      provide .dev instead
  36  * @hog_on_boot: if this is set to true, the pin control subsystem will itself
  37  *      hog the mappings as the pinmux device drivers are attached, so this is
  38  *      typically used with system maps (mux mappings without an assigned
  39  *      device) that you want to get hogged and enabled by default as soon as
  40  *      a pinmux device supporting it is registered. These maps will not be
  41  *      disabled and put until the system shuts down.
  42  */
  43 struct pinmux_map {
  44         const char *name;
  45         struct device *ctrl_dev;
  46         const char *ctrl_dev_name;
  47         const char *function;
  48         const char *group;
  49         struct device *dev;
  50         const char *dev_name;
  51         bool hog_on_boot;
  52 };
  53
  54 /*
  55  * Convenience macro to set a simple map from a certain pin controller and a
  56  * certain function to a named device
  57  */
  58 #define PINMUX_MAP(a, b, c, d) \
  59         { .name = a, .ctrl_dev_name = b, .function = c, .dev_name = d }
  60
  61 /*
  62  * Convenience macro to map a system function onto a certain pinctrl device.
  63  * System functions are not assigned to a particular device.
  64  */
  65 #define PINMUX_MAP_SYS(a, b, c) \
  66         { .name = a, .ctrl_dev_name = b, .function = c }
  67
  68 /*
  69  * Convenience macro to map a system function onto a certain pinctrl device,
  70  * to be hogged by the pinmux core until the system shuts down.
  71  */
  72 #define PINMUX_MAP_SYS_HOG(a, b, c) \
  73         { .name = a, .ctrl_dev_name = b, .function = c, \
  74           .hog_on_boot = true }
  75
  76 /*
  77  * Convenience macro to map a system function onto a certain pinctrl device
  78  * using a specified group, to be hogged by the pinmux core until the system
  79  * shuts down.
  80  */
  81 #define PINMUX_MAP_SYS_HOG_GROUP(a, b, c, d)            \
  82         { .name = a, .ctrl_dev_name = b, .function = c, .group = d, \
  83           .hog_on_boot = true }
  84
  85 #ifdef CONFIG_PINMUX
  86
  87 extern int pinmux_register_mappings(struct pinmux_map const *map,
  88                                 unsigned num_maps);
  89
  90 #else
  91
  92 static inline int pinmux_register_mappings(struct pinmux_map const *map,
  93                                            unsigned num_maps)
  94 {
  95         return 0;
  96 }
  97
  98 #endif /* !CONFIG_PINMUX */
  99 #endif