From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>,
Andy Shevchenko <andy@infradead.org>,
Hans de Goede <hdegoede@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Darren Hart <dvhart@infradead.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/3] software node: Add software_node_find_by_name()
Date: Fri, 16 Aug 2019 13:45:13 +0300 [thread overview]
Message-ID: <20190816104515.63613-2-heikki.krogerus@linux.intel.com> (raw)
In-Reply-To: <20190816104515.63613-1-heikki.krogerus@linux.intel.com>
Function that searches software nodes by node name.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/base/swnode.c | 37 +++++++++++++++++++++++++++++++++++++
include/linux/property.h | 4 ++++
2 files changed, 41 insertions(+)
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index e7b3aa3bd55a..ee2a405cca9a 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -620,6 +620,43 @@ static const struct fwnode_operations software_node_ops = {
/* -------------------------------------------------------------------------- */
+/**
+ * software_node_find_by_name - Find software node by name
+ * @parent: Parent of the software node
+ * @name: Name of the software node
+ *
+ * The function will find a node that is child of @parent and that is named
+ * @name. If no node is found, the function returns NULL.
+ *
+ * NOTE: you will need to drop the reference with fwnode_handle_put() after use.
+ */
+const struct software_node *
+software_node_find_by_name(const struct software_node *parent, const char *name)
+{
+ struct swnode *swnode;
+ struct kobject *k;
+
+ if (!name)
+ return NULL;
+
+ spin_lock(&swnode_kset->list_lock);
+
+ list_for_each_entry(k, &swnode_kset->list, entry) {
+ swnode = kobj_to_swnode(k);
+ if (parent == swnode->node->parent && swnode->node->name &&
+ !strcmp(name, swnode->node->name)) {
+ kobject_get(&swnode->kobj);
+ break;
+ }
+ swnode = NULL;
+ }
+
+ spin_unlock(&swnode_kset->list_lock);
+
+ return swnode ? swnode->node : NULL;
+}
+EXPORT_SYMBOL_GPL(software_node_find_by_name);
+
static int
software_node_register_properties(struct software_node *node,
const struct property_entry *properties)
diff --git a/include/linux/property.h b/include/linux/property.h
index 5a910ad79591..9b3d4ca3a73a 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -421,6 +421,10 @@ bool is_software_node(const struct fwnode_handle *fwnode);
const struct software_node *to_software_node(struct fwnode_handle *fwnode);
struct fwnode_handle *software_node_fwnode(const struct software_node *node);
+const struct software_node *
+software_node_find_by_name(const struct software_node *parent,
+ const char *name);
+
int software_node_register_nodes(const struct software_node *nodes);
void software_node_unregister_nodes(const struct software_node *nodes);
--
2.23.0.rc1
next prev parent reply other threads:[~2019-08-16 10:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-16 10:45 [PATCH v2 0/3] software node: Introduce software_node_find_by_name() Heikki Krogerus
2019-08-16 10:45 ` Heikki Krogerus [this message]
2019-08-16 13:42 ` [PATCH v2 1/3] software node: Add software_node_find_by_name() Andy Shevchenko
2019-08-16 10:45 ` [PATCH v2 2/3] usb: roles: intel_xhci: Supplying software node for the role mux Heikki Krogerus
2019-08-16 13:45 ` Andy Shevchenko
2019-08-16 13:52 ` Heikki Krogerus
2019-08-16 19:43 ` Hans de Goede
2019-08-16 10:45 ` [PATCH v2 3/3] platform/x86: intel_cht_int33fe: Use new API to gain access to the role switch Heikki Krogerus
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