Merge branch 'reset/lookup' into reset/next
Merge the reset lookup support for non-DT platforms, from an immutable branch provided for merging into the davinci tree.
This commit is contained in:
commit
0089313d85
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@ -23,6 +23,9 @@
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static DEFINE_MUTEX(reset_list_mutex);
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static LIST_HEAD(reset_controller_list);
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static DEFINE_MUTEX(reset_lookup_mutex);
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static LIST_HEAD(reset_lookup_list);
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/**
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* struct reset_control - a reset control
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* @rcdev: a pointer to the reset controller device
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@ -148,6 +151,33 @@ int devm_reset_controller_register(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(devm_reset_controller_register);
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/**
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* reset_controller_add_lookup - register a set of lookup entries
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* @lookup: array of reset lookup entries
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* @num_entries: number of entries in the lookup array
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*/
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void reset_controller_add_lookup(struct reset_control_lookup *lookup,
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unsigned int num_entries)
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{
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struct reset_control_lookup *entry;
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unsigned int i;
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mutex_lock(&reset_lookup_mutex);
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for (i = 0; i < num_entries; i++) {
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entry = &lookup[i];
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if (!entry->dev_id || !entry->provider) {
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pr_warn("%s(): reset lookup entry badly specified, skipping\n",
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__func__);
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continue;
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}
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list_add_tail(&entry->list, &reset_lookup_list);
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}
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mutex_unlock(&reset_lookup_mutex);
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}
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EXPORT_SYMBOL_GPL(reset_controller_add_lookup);
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static inline struct reset_control_array *
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rstc_to_array(struct reset_control *rstc) {
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return container_of(rstc, struct reset_control_array, base);
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@ -493,6 +523,70 @@ struct reset_control *__of_reset_control_get(struct device_node *node,
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}
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EXPORT_SYMBOL_GPL(__of_reset_control_get);
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static struct reset_controller_dev *
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__reset_controller_by_name(const char *name)
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{
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struct reset_controller_dev *rcdev;
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lockdep_assert_held(&reset_list_mutex);
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list_for_each_entry(rcdev, &reset_controller_list, list) {
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if (!rcdev->dev)
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continue;
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if (!strcmp(name, dev_name(rcdev->dev)))
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return rcdev;
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}
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return NULL;
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}
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static struct reset_control *
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__reset_control_get_from_lookup(struct device *dev, const char *con_id,
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bool shared, bool optional)
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{
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const struct reset_control_lookup *lookup;
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struct reset_controller_dev *rcdev;
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const char *dev_id = dev_name(dev);
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struct reset_control *rstc = NULL;
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if (!dev)
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return ERR_PTR(-EINVAL);
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mutex_lock(&reset_lookup_mutex);
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list_for_each_entry(lookup, &reset_lookup_list, list) {
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if (strcmp(lookup->dev_id, dev_id))
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continue;
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if ((!con_id && !lookup->con_id) ||
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((con_id && lookup->con_id) &&
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!strcmp(con_id, lookup->con_id))) {
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mutex_lock(&reset_list_mutex);
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rcdev = __reset_controller_by_name(lookup->provider);
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if (!rcdev) {
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mutex_unlock(&reset_list_mutex);
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mutex_unlock(&reset_lookup_mutex);
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/* Reset provider may not be ready yet. */
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return ERR_PTR(-EPROBE_DEFER);
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}
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rstc = __reset_control_get_internal(rcdev,
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lookup->index,
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shared);
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mutex_unlock(&reset_list_mutex);
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break;
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}
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}
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mutex_unlock(&reset_lookup_mutex);
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if (!rstc)
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return optional ? NULL : ERR_PTR(-ENOENT);
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return rstc;
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}
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struct reset_control *__reset_control_get(struct device *dev, const char *id,
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int index, bool shared, bool optional)
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{
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@ -500,7 +594,7 @@ struct reset_control *__reset_control_get(struct device *dev, const char *id,
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return __of_reset_control_get(dev->of_node, id, index, shared,
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optional);
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return optional ? NULL : ERR_PTR(-EINVAL);
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return __reset_control_get_from_lookup(dev, id, shared, optional);
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}
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EXPORT_SYMBOL_GPL(__reset_control_get);
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@ -26,6 +26,31 @@ struct module;
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struct device_node;
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struct of_phandle_args;
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/**
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* struct reset_control_lookup - represents a single lookup entry
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*
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* @list: internal list of all reset lookup entries
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* @provider: name of the reset controller device controlling this reset line
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* @index: ID of the reset controller in the reset controller device
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* @dev_id: name of the device associated with this reset line
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* @con_id name of the reset line (can be NULL)
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*/
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struct reset_control_lookup {
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struct list_head list;
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const char *provider;
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unsigned int index;
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const char *dev_id;
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const char *con_id;
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};
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#define RESET_LOOKUP(_provider, _index, _dev_id, _con_id) \
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{ \
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.provider = _provider, \
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.index = _index, \
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.dev_id = _dev_id, \
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.con_id = _con_id, \
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}
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/**
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* struct reset_controller_dev - reset controller entity that might
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* provide multiple reset controls
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@ -33,6 +58,7 @@ struct of_phandle_args;
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* @owner: kernel module of the reset controller driver
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* @list: internal list of reset controller devices
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* @reset_control_head: head of internal list of requested reset controls
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* @dev: corresponding driver model device struct
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* @of_node: corresponding device tree node as phandle target
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* @of_reset_n_cells: number of cells in reset line specifiers
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* @of_xlate: translation function to translate from specifier as found in the
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struct module *owner;
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struct list_head list;
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struct list_head reset_control_head;
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struct device *dev;
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struct device_node *of_node;
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int of_reset_n_cells;
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int (*of_xlate)(struct reset_controller_dev *rcdev,
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int devm_reset_controller_register(struct device *dev,
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struct reset_controller_dev *rcdev);
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void reset_controller_add_lookup(struct reset_control_lookup *lookup,
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unsigned int num_entries);
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#endif
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