652162d469
Per recent updates to Documentation/gpio.txt, gpiolib drivers should inform pinctrl when a GPIO is requested. pinctrl then marks that pin as in-use for that GPIO function. When an SoC muxes pins in a group, it's quite possible for the group to contain e.g. 6 pins, but only 4 of them actually be needed by the HW module that's mux'd to them. In this case, the other 2 pins could be used as GPIOs. However, pinctrl marks all the pins within the group as in-use by the selected mux function. To allow the expected gpiolib interaction, separate the concepts of pin ownership into two parts: One for the mux function and one for GPIO usage. Finally, allow those two ownerships to exist in parallel. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
156 lines
4.8 KiB
C
156 lines
4.8 KiB
C
/*
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* Core private header for the pin control 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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*
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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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#include <linux/mutex.h>
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#include <linux/radix-tree.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/machine.h>
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struct pinctrl_gpio_range;
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/**
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* struct pinctrl_dev - pin control class device
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* @node: node to include this pin controller in the global pin controller list
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* @desc: the pin controller descriptor supplied when initializing this pin
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* controller
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* @pin_desc_tree: each pin descriptor for this pin controller is stored in
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* this radix tree
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* @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
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* ranges are added to this list at runtime
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* @dev: the device entry for this pin controller
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* @owner: module providing the pin controller, used for refcounting
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* @driver_data: driver data for drivers registering to the pin controller
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* subsystem
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* @p: result of pinctrl_get() for this device
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* @device_root: debugfs root for this device
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*/
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struct pinctrl_dev {
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struct list_head node;
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struct pinctrl_desc *desc;
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struct radix_tree_root pin_desc_tree;
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struct list_head gpio_ranges;
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struct device *dev;
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struct module *owner;
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void *driver_data;
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struct pinctrl *p;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *device_root;
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#endif
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};
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/**
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* struct pinctrl - per-device pin control state holder
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* @node: global list node
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* @dev: the device using this pin control handle
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* @states: a list of states for this device
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* @state: the current state
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*/
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struct pinctrl {
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struct list_head node;
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struct device *dev;
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struct list_head states;
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struct pinctrl_state *state;
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};
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/**
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* struct pinctrl_state - a pinctrl state for a device
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* @node: list not for struct pinctrl's @states field
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* @name: the name of this state
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* @settings: a list of settings for this state
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*/
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struct pinctrl_state {
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struct list_head node;
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const char *name;
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struct list_head settings;
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};
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/**
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* struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
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* @group: the group selector to program
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* @func: the function selector to program
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*/
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struct pinctrl_setting_mux {
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unsigned group;
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unsigned func;
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};
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/**
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* struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
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* @group_or_pin: the group selector or pin ID to program
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* @configs: a pointer to an array of config parameters/values to program into
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* hardware. Each individual pin controller defines the format and meaning
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* of config parameters.
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* @num_configs: the number of entries in array @configs
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*/
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struct pinctrl_setting_configs {
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unsigned group_or_pin;
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unsigned long *configs;
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unsigned num_configs;
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};
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/**
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* struct pinctrl_setting - an individual mux or config setting
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* @node: list node for struct pinctrl_settings's @settings field
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* @type: the type of setting
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* @pctldev: pin control device handling to be programmed
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* @data: Data specific to the setting type
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*/
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struct pinctrl_setting {
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struct list_head node;
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enum pinctrl_map_type type;
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struct pinctrl_dev *pctldev;
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union {
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struct pinctrl_setting_mux mux;
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struct pinctrl_setting_configs configs;
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} data;
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};
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/**
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* struct pin_desc - pin descriptor for each physical pin in the arch
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* @pctldev: corresponding pin control device
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* @name: a name for the pin, e.g. the name of the pin/pad/finger on a
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* datasheet or such
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* @dynamic_name: if the name of this pin was dynamically allocated
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* @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
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* If non-zero, this pin is claimed by @owner. This field is an integer
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* rather than a boolean, since pinctrl_get() might process multiple
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* mapping table entries that refer to, and hence claim, the same group
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* or pin, and each of these will increment the @usecount.
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* @mux_owner: The name of device that called pinctrl_get().
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* @mux_setting: The most recent selected mux setting for this pin, if any.
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* @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is
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* the name of the GPIO that "owns" this pin.
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*/
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struct pin_desc {
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struct pinctrl_dev *pctldev;
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const char *name;
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bool dynamic_name;
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/* These fields only added when supporting pinmux drivers */
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#ifdef CONFIG_PINMUX
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unsigned mux_usecount;
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const char *mux_owner;
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const struct pinctrl_setting_mux *mux_setting;
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const char *gpio_owner;
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#endif
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};
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struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
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int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
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int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
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const char *pin_group);
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static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
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unsigned int pin)
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{
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return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
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}
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extern struct mutex pinctrl_mutex;
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