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_PINCTRL_MACHINE_H
  13 #define __LINUX_PINCTRL_MACHINE_H
  14
  15 /**
  16  * struct pinctrl_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_name: the name of the device controlling this specific mapping,
  21  *      the name must be the same as in your struct device*
  22  * @function: a function in the driver to use for this mapping, the driver
  23  *      will lookup the function referenced by this ID on the specified
  24  *      pin control device
  25  * @group: sometimes a function can map to different pin groups, so this
  26  *      selects a certain specific pin group to activate for the function, if
  27  *      left as NULL, the first applicable group will be used
  28  * @dev_name: the name of the device using this specific mapping, the name
  29  *      must be the same as in your struct device*
  30  * @hog_on_boot: if this is set to true, the pin control subsystem will itself
  31  *      hog the mappings as the pinmux device drivers are attached, so this is
  32  *      typically used with system maps (mux mappings without an assigned
  33  *      device) that you want to get hogged and enabled by default as soon as
  34  *      a pinmux device supporting it is registered. These maps will not be
  35  *      disabled and put until the system shuts down.
  36  */
  37 struct pinctrl_map {
  38         const char *name;
  39         const char *ctrl_dev_name;
  40         const char *function;
  41         const char *group;
  42         const char *dev_name;
  43         bool hog_on_boot;
  44 };
  45
  46 /*
  47  * Convenience macro to set a simple map from a certain pin controller and a
  48  * certain function to a named device
  49  */
  50 #define PIN_MAP(a, b, c, d) \
  51         { .name = a, .ctrl_dev_name = b, .function = c, .dev_name = d }
  52
  53 /*
  54  * Convenience macro to map a system function onto a certain pinctrl device.
  55  * System functions are not assigned to a particular device.
  56  */
  57 #define PIN_MAP_SYS(a, b, c) \
  58         { .name = a, .ctrl_dev_name = b, .function = c }
  59
  60 /*
  61  * Convenience macro to map a system function onto a certain pinctrl device,
  62  * to be hogged by the pin control core until the system shuts down.
  63  */
  64 #define PIN_MAP_SYS_HOG(a, b, c) \
  65         { .name = a, .ctrl_dev_name = b, .function = c, \
  66           .hog_on_boot = true }
  67
  68 /*
  69  * Convenience macro to map a system function onto a certain pinctrl device
  70  * using a specified group, to be hogged by the pin control core until the
  71  * system shuts down.
  72  */
  73 #define PIN_MAP_SYS_HOG_GROUP(a, b, c, d)               \
  74         { .name = a, .ctrl_dev_name = b, .function = c, .group = d, \
  75           .hog_on_boot = true }
  76
  77 #ifdef CONFIG_PINMUX
  78
  79 extern int pinctrl_register_mappings(struct pinctrl_map const *map,
  80                                 unsigned num_maps);
  81
  82 #else
  83
  84 static inline int pinctrl_register_mappings(struct pinctrl_map const *map,
  85                                            unsigned num_maps)
  86 {
  87         return 0;
  88 }
  89
  90 #endif /* !CONFIG_PINMUX */
  91 #endif