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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2018-03-23 16:04:48 +0300
committerPhilipp Zabel <p.zabel@pengutronix.de>2018-03-27 11:39:47 +0300
commite2749bb998701e21cdb8b34486b82fc1c051ab41 (patch)
treec556d6f584df155e4ab6f56f88f4a4f928f4e836 /drivers/reset
parent6691dffab0ab6301bb7b489b1dcf9f5efdef202f (diff)
downloadlinux-e2749bb998701e21cdb8b34486b82fc1c051ab41.tar.xz
reset: modify the way reset lookup works for board files
Commit 7af1bb19f1d7 ("reset: add support for non-DT systems") introduced reset control lookup mechanism for boards that still use board files. The routine used to register lookup entries takes the corresponding reset_controlled_dev structure as argument. It's been determined however that for the first user of this new interface - davinci psc driver - it will be easier to register the lookup entries using the reset controller device name. This patch changes the way lookup entries are added. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> [p.zabel@pengutronix.de: added missing ERR_PTR] Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/reset')
-rw-r--r--drivers/reset/core.c38
1 files changed, 31 insertions, 7 deletions
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 06fa4907afc4..6488292e129c 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -153,12 +153,10 @@ EXPORT_SYMBOL_GPL(devm_reset_controller_register);
/**
* reset_controller_add_lookup - register a set of lookup entries
- * @rcdev: initialized reset controller device owning the reset line
* @lookup: array of reset lookup entries
* @num_entries: number of entries in the lookup array
*/
-void reset_controller_add_lookup(struct reset_controller_dev *rcdev,
- struct reset_control_lookup *lookup,
+void reset_controller_add_lookup(struct reset_control_lookup *lookup,
unsigned int num_entries)
{
struct reset_control_lookup *entry;
@@ -168,13 +166,12 @@ void reset_controller_add_lookup(struct reset_controller_dev *rcdev,
for (i = 0; i < num_entries; i++) {
entry = &lookup[i];
- if (!entry->dev_id) {
- pr_warn("%s(): reset lookup entry has no dev_id, skipping\n",
+ if (!entry->dev_id || !entry->provider) {
+ pr_warn("%s(): reset lookup entry badly specified, skipping\n",
__func__);
continue;
}
- entry->rcdev = rcdev;
list_add_tail(&entry->list, &reset_lookup_list);
}
mutex_unlock(&reset_lookup_mutex);
@@ -526,11 +523,30 @@ struct reset_control *__of_reset_control_get(struct device_node *node,
}
EXPORT_SYMBOL_GPL(__of_reset_control_get);
+static struct reset_controller_dev *
+__reset_controller_by_name(const char *name)
+{
+ struct reset_controller_dev *rcdev;
+
+ lockdep_assert_held(&reset_list_mutex);
+
+ list_for_each_entry(rcdev, &reset_controller_list, list) {
+ if (!rcdev->dev)
+ continue;
+
+ if (!strcmp(name, dev_name(rcdev->dev)))
+ return rcdev;
+ }
+
+ return NULL;
+}
+
static struct reset_control *
__reset_control_get_from_lookup(struct device *dev, const char *con_id,
bool shared, bool optional)
{
const struct reset_control_lookup *lookup;
+ struct reset_controller_dev *rcdev;
const char *dev_id = dev_name(dev);
struct reset_control *rstc = NULL;
@@ -547,7 +563,15 @@ __reset_control_get_from_lookup(struct device *dev, const char *con_id,
((con_id && lookup->con_id) &&
!strcmp(con_id, lookup->con_id))) {
mutex_lock(&reset_list_mutex);
- rstc = __reset_control_get_internal(lookup->rcdev,
+ rcdev = __reset_controller_by_name(lookup->provider);
+ if (!rcdev) {
+ mutex_unlock(&reset_list_mutex);
+ mutex_unlock(&reset_lookup_mutex);
+ /* Reset provider may not be ready yet. */
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ rstc = __reset_control_get_internal(rcdev,
lookup->index,
shared);
mutex_unlock(&reset_list_mutex);