[tip: timers/core] reset: Add of_reset_control_get_optional_exclusive()

[tip-bot2 for Biju Das]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     c4f5b30dda01f2f6979a9681142de454991182ee
Gitweb:        https://git.kernel.org/tip/c4f5b30dda01f2f6979a9681142de454991182ee
Author:        Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
AuthorDate:    Fri, 12 Nov 2021 18:44:10 
Committer:     Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
CommitterDate: Fri, 19 Nov 2021 12:23:45 +01:00

reset: Add of_reset_control_get_optional_exclusive()

Add optional variant of of_reset_control_get_exclusive(). If the
requested reset is not specified in the device tree, this function
returns NULL instead of an error.

Suggested-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211112184413.4391-2-biju.das.jz@xxxxxxxxxxxxxx
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
---
 include/linux/reset.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/linux/reset.h b/include/linux/reset.h
index db0e611..8a21b57 100644
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -455,6 +455,26 @@ static inline struct reset_control *of_reset_control_get_exclusive(
 }
 
 /**
+ * of_reset_control_get_optional_exclusive - Lookup and obtain an optional exclusive
+ *                                           reference to a reset controller.
+ * @node: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Optional variant of of_reset_control_get_exclusive(). If the requested reset
+ * is not specified in the device tree, this function returns NULL instead of
+ * an error.
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * Use of id names is optional.
+ */
+static inline struct reset_control *of_reset_control_get_optional_exclusive(
+				struct device_node *node, const char *id)
+{
+	return __of_reset_control_get(node, id, 0, false, true, true);
+}
+
+/**
  * of_reset_control_get_shared - Lookup and obtain a shared reference
  *                               to a reset controller.
  * @node: device to be reset by the controller