linux-kernel - [RFC PATCH 2/4] reset: Allow removing a lookup

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Message-ID: <20240411052257.2113-3-tony@atomide.com>
Date: Thu, 11 Apr 2024 08:22:55 +0300
From: Tony Lindgren <tony@...mide.com>
To: linux-omap@...r.kernel.org
Cc: Dhruva Gole <d-gole@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: [RFC PATCH 2/4] reset: Allow removing a lookup

If a parent device provides resets for the child devices using a lookup
table, let's also allow removal of the lookup table when removing the
child devices.

Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/reset/core.c             | 27 +++++++++++++++++++++++++++
 include/linux/reset-controller.h |  7 +++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -217,6 +217,33 @@ void reset_controller_add_lookup(struct reset_control_lookup *lookup,
 }
 EXPORT_SYMBOL_GPL(reset_controller_add_lookup);
 
+/**
+ * reset_controller_remove_lookup - unregister a set of lookup entries
+ * @lookup: array of reset lookup entries
+ * @num_entries: number of entries in the lookup array
+ */
+void reset_controller_remove_lookup(struct reset_control_lookup *lookup,
+				    unsigned int num_entries)
+{
+	struct reset_control_lookup *entry;
+	unsigned int i;
+
+	mutex_lock(&reset_lookup_mutex);
+	for (i = 0; i < num_entries; i++) {
+		entry = &lookup[i];
+
+		if (!entry->dev_id || !entry->provider) {
+			pr_warn("%s(): reset lookup entry badly specified, skipping\n",
+				__func__);
+			continue;
+		}
+
+		list_del(&entry->list);
+	}
+	mutex_unlock(&reset_lookup_mutex);
+}
+EXPORT_SYMBOL_GPL(reset_controller_remove_lookup);
+
 static inline struct reset_control_array *
 rstc_to_array(struct reset_control *rstc) {
 	return container_of(rstc, struct reset_control_array, base);
diff --git a/include/linux/reset-controller.h b/include/linux/reset-controller.h
--- a/include/linux/reset-controller.h
+++ b/include/linux/reset-controller.h
@@ -93,6 +93,8 @@ int devm_reset_controller_register(struct device *dev,
 
 void reset_controller_add_lookup(struct reset_control_lookup *lookup,
 				 unsigned int num_entries);
+void reset_controller_remove_lookup(struct reset_control_lookup *lookup,
+				    unsigned int num_entries);
 #else
 static inline int reset_controller_register(struct reset_controller_dev *rcdev)
 {
@@ -113,6 +115,11 @@ static inline void reset_controller_add_lookup(struct reset_control_lookup *look
 					       unsigned int num_entries)
 {
 }
+
+static inline void reset_controller_remove_lookup(struct reset_control_lookup *lookup,
+						  unsigned int num_entries)
+{
+}
 #endif
 
 #endif
-- 
2.44.0