From: Sakari Ailus <sakari.ailus@linux.intel.com>
To: Petr Mladek <pmladek@suse.com>,
linux-kernel@vger.kernel.org, rafael@kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-acpi@vger.kernel.org, devicetree@vger.kernel.org,
Rob Herring <robh@kernel.org>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>
Subject: [PATCH v5 04/11] device property: Add functions for accessing node's parents
Date: Mon, 2 Sep 2019 16:57:25 +0300 [thread overview]
Message-ID: <20190902135732.23455-5-sakari.ailus@linux.intel.com> (raw)
In-Reply-To: <20190902135732.23455-1-sakari.ailus@linux.intel.com>
Add two convenience functions for accessing node's parents:
fwnode_count_parents() returns the number of parent nodes a given node
has. fwnode_get_nth_parent() returns node's parent at a given distance
from the node itself.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/base/property.c | 46 ++++++++++++++++++++++++++++++++++++++++
include/linux/property.h | 3 +++
2 files changed, 49 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 3d9dffbe96378..f2e555e68b56a 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -590,6 +590,52 @@ struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
}
EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
+/**
+ * fwnode_count_parents - Return the number of parents a node has
+ * @fwnode: The node the parents of which are to be counted
+ *
+ * Returns the number of parents a node has.
+ */
+unsigned int fwnode_count_parents(const struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *__fwnode;
+ unsigned int count;
+
+ __fwnode = fwnode_get_parent(fwnode);
+
+ for (count = 0; __fwnode; count++)
+ __fwnode = fwnode_get_next_parent(__fwnode);
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(fwnode_count_parents);
+
+/**
+ * fwnode_get_nth_parent - Return an nth parent of a node
+ * @fwnode: The node the parent of which is requested
+ * @depth: Distance of the parent from the node
+ *
+ * Returns the nth parent of a node. If there is no parent at the requested
+ * @depth, %NULL is returned. If @depth is 0, the functionality is equivalent to
+ * fwnode_handle_get(). For @depth == 1, it is fwnode_get_parent() and so on.
+ *
+ * The caller is responsible for calling fwnode_handle_put() for the returned
+ * node.
+ */
+struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
+ unsigned int depth)
+{
+ unsigned int i;
+
+ fwnode_handle_get(fwnode);
+
+ for (i = 0; i < depth && fwnode; i++)
+ fwnode = fwnode_get_next_parent(fwnode);
+
+ return fwnode;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
+
/**
* fwnode_get_next_child_node - Return the next child node handle for a node
* @fwnode: Firmware node to find the next child node for.
diff --git a/include/linux/property.h b/include/linux/property.h
index 421c76e53708d..5450e7ec219ac 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -83,6 +83,9 @@ struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_next_parent(
struct fwnode_handle *fwnode);
+unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
+struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
+ unsigned int depth);
struct fwnode_handle *fwnode_get_next_child_node(
const struct fwnode_handle *fwnode, struct fwnode_handle *child);
struct fwnode_handle *fwnode_get_next_available_child_node(
--
2.20.1
next prev parent reply other threads:[~2019-09-02 13:58 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-02 13:57 [PATCH v5 00/11] Device property improvements, add %pfw format specifier Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 01/11] software node: Get reference to parent swnode in get_parent op Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 02/11] software node: Make argument to to_software_node const Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 03/11] device property: Move fwnode_get_parent() up Sakari Ailus
2019-09-02 13:57 ` Sakari Ailus [this message]
2019-09-02 13:57 ` [PATCH v5 05/11] device property: Add fwnode_get_name for returning the name of a node Sakari Ailus
2019-09-03 10:10 ` Heikki Krogerus
2019-09-03 11:24 ` Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 06/11] device property: Add a function to obtain a node's prefix Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 07/11] lib/vsprintf: Remove support for %pF and %pf in favour of %pS and %ps Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 08/11] lib/vsprintf: Make use of fwnode API to obtain node names and separators Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 09/11] lib/vsprintf: OF nodes are first and foremost, struct device_nodes Sakari Ailus
2019-09-03 8:52 ` Petr Mladek
2019-09-03 9:28 ` Petr Mladek
2019-09-03 11:28 ` Andy Shevchenko
2019-09-06 7:04 ` Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 10/11] lib/vsprintf: Add %pfw conversion specifier for printing fwnode names Sakari Ailus
2019-09-02 13:57 ` [PATCH v5 11/11] lib/test_printf: Add tests for %pfw printk modifier Sakari Ailus
2019-09-02 16:13 ` Andy Shevchenko
2019-09-04 16:10 ` Sakari Ailus
2019-09-04 17:22 ` Andy Shevchenko
2019-09-06 7:00 ` Sakari Ailus
2019-09-03 9:38 ` [PATCH v5 00/11] Device property improvements, add %pfw format specifier Joe Perches
2019-09-04 16:04 ` Sakari Ailus
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