1681f5ae4c
Hog entries are mapping table entries with .ctrl_dev_name == .dev_name. All other mapping table entries need .dev_name set so that they will match some pinctrl_get() call. All extant PIN_MAP*() macros set .dev_name. So, there is no reason to allow mapping table entries without .dev_name set. Update the code and documentation to disallow this. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*
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* Machine interface for the pinctrl subsystem.
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*
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* Copyright (C) 2011 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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* Based on bits of regulator core, gpio core and clk core
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#ifndef __LINUX_PINCTRL_MACHINE_H
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#define __LINUX_PINCTRL_MACHINE_H
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/**
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* struct pinctrl_map - boards/machines shall provide this map for devices
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* @name: the name of this specific map entry for the particular machine.
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* This is the second parameter passed to pinmux_get() when you want
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* to have several mappings to the same device
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* @ctrl_dev_name: the name of the device controlling this specific mapping,
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* the name must be the same as in your struct device*
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* @function: a function in the driver to use for this mapping, the driver
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* will lookup the function referenced by this ID on the specified
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* pin control device
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* @group: sometimes a function can map to different pin groups, so this
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* selects a certain specific pin group to activate for the function, if
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* left as NULL, the first applicable group will be used
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* @dev_name: the name of the device using this specific mapping, the name
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* must be the same as in your struct device*. If this name is set to the
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* same name as the pin controllers own dev_name(), the map entry will be
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* hogged by the driver itself upon registration
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*/
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struct pinctrl_map {
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const char *name;
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const char *ctrl_dev_name;
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const char *function;
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const char *group;
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const char *dev_name;
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};
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/*
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* Convenience macro to set a simple map from a certain pin controller and a
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* certain function to a named device
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*/
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#define PIN_MAP(a, b, c, d) \
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{ .name = a, .ctrl_dev_name = b, .function = c, .dev_name = d }
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/*
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* Convenience macro to map a system function onto a certain pinctrl device,
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* to be hogged by the pin control core until the system shuts down.
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*/
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#define PIN_MAP_SYS_HOG(a, b, c) \
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{ .name = a, .ctrl_dev_name = b, .dev_name = b, .function = c, }
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/*
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* Convenience macro to map a system function onto a certain pinctrl device
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* using a specified group, to be hogged by the pin control core until the
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* system shuts down.
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*/
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#define PIN_MAP_SYS_HOG_GROUP(a, b, c, d) \
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{ .name = a, .ctrl_dev_name = b, .dev_name = b, .function = c, \
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.group = d, }
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#ifdef CONFIG_PINMUX
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extern int pinctrl_register_mappings(struct pinctrl_map const *map,
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unsigned num_maps);
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#else
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static inline int pinctrl_register_mappings(struct pinctrl_map const *map,
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unsigned num_maps)
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{
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return 0;
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}
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#endif /* !CONFIG_PINMUX */
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#endif
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