[v4,1/1] device property: Add fwnode_name_eq()

Commit Message

Sakari Ailus Nov. 3, 2023, 7:06 a.m. UTC

Add fwnode_name_eq() to implement the functionality of of_node_name_eq()
on fwnode property API. The same convention of ending the comparison at
'@' (besides NUL) is applied on also both ACPI and swnode. The function
is intended for comparing unit address-less node names on DT and firmware
or swnodes compliant with DT bindings.

Signed-off-by: Sakari Ailus <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Tested-by: Laurent Pinchart <[e-mail]>
---
since v3:

- Use ptrdiff_t type for len.

 drivers/base/property.c  | 28 ++++++++++++++++++++++++++++
 include/linux/property.h |  1 +
 2 files changed, 29 insertions(+)

Comments

Andy Shevchenko Nov. 6, 2023, 11:29 a.m. UTC | #1

On Fri, Nov 03, 2023 at 09:06:31AM +0200, Sakari Ailus wrote:
> Add fwnode_name_eq() to implement the functionality of of_node_name_eq()
> on fwnode property API. The same convention of ending the comparison at
> '@' (besides NUL) is applied on also both ACPI and swnode. The function
> is intended for comparing unit address-less node names on DT and firmware
> or swnodes compliant with DT bindings.

Reviewed-by: Andy Shevchenko <[e-mail]>

I believe I gave already the tag...

Sakari Ailus Nov. 6, 2023, 12:32 p.m. UTC | #2

On Mon, Nov 06, 2023 at 01:29:22PM +0200, Andy Shevchenko wrote:
> On Fri, Nov 03, 2023 at 09:06:31AM +0200, Sakari Ailus wrote:
> > Add fwnode_name_eq() to implement the functionality of of_node_name_eq()
> > on fwnode property API. The same convention of ending the comparison at
> > '@' (besides NUL) is applied on also both ACPI and swnode. The function
> > is intended for comparing unit address-less node names on DT and firmware
> > or swnodes compliant with DT bindings.
> 
> Reviewed-by: Andy Shevchenko <[e-mail]>
> 
> I believe I gave already the tag...

I guess I've missed it earlier... Thanks!

Patch

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 8667b13639d2..f20379c9a5c9 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -595,6 +595,34 @@  const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
 	return fwnode_call_ptr_op(fwnode, get_name_prefix);
 }
 
+/**
+ * fwnode_name_eq - Return true if node name is equal
+ * @fwnode: The firmware node
+ * @name: The name to which to compare the node name
+ *
+ * Compare the name provided as an argument to the name of the node, stopping
+ * the comparison at either NUL or '@' character, whichever comes first. This
+ * function is generally used for comparing node names while ignoring the
+ * possible unit address of the node.
+ *
+ * Return: true if the node name matches with the name provided in the @name
+ * argument, false otherwise.
+ */
+bool fwnode_name_eq(const struct fwnode_handle *fwnode, const char *name)
+{
+	const char *node_name;
+	ptrdiff_t len;
+
+	node_name = fwnode_get_name(fwnode);
+	if (!node_name)
+		return false;
+
+	len = strchrnul(node_name, '@') - node_name;
+
+	return str_has_prefix(node_name, name) == len;
+}
+EXPORT_SYMBOL_GPL(fwnode_name_eq);
+
 /**
  * fwnode_get_parent - Return parent firwmare node
  * @fwnode: Firmware whose parent is retrieved
diff --git a/include/linux/property.h b/include/linux/property.h
index 083a1f41364b..096ade186601 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -108,6 +108,7 @@  struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
 
 const char *fwnode_get_name(const struct fwnode_handle *fwnode);
 const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
+bool fwnode_name_eq(const struct fwnode_handle *fwnode, const char *name);
 
 struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
 struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode);