linux-kernel - [PATCH 1/2] clk: add devm variant of clk_notifier

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Date:   Wed, 21 Oct 2020 18:38:46 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Jerome Brunet <jbrunet@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, Kevin Hilman <khilman@...libre.com>
Subject: [PATCH 1/2] clk: add devm variant of clk_notifier_register

Add a memory managed variant of clk_notifier_register() to make life easier
on clock consumers using notifiers

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/clk/clk.c   | 36 ++++++++++++++++++++++++++++++++++++
 include/linux/clk.h | 10 ++++++++++
 2 files changed, 46 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index d27153f26fa9..e9fdd1d9b3f5 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -4395,6 +4395,42 @@ int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(clk_notifier_unregister);
 
+struct clk_notifier_devres {
+	struct clk *clk;
+	struct notifier_block *nb;
+};
+
+static void devm_clk_notifier_release(struct device *dev, void *res)
+{
+	struct clk_notifier_devres *devres = res;
+
+	clk_notifier_unregister(devres->clk, devres->nb);
+}
+
+int devm_clk_notifier_register(struct device *dev, struct clk *clk,
+			       struct notifier_block *nb)
+{
+	struct clk_notifier_devres *devres;
+	int ret;
+
+	devres = devres_alloc(devm_clk_notifier_release,
+			      sizeof(*devres), GFP_KERNEL);
+
+	if (!devres)
+		return -ENOMEM;
+
+	ret = clk_notifier_register(clk, nb);
+	if (!ret) {
+		devres->clk = clk;
+		devres->nb = nb;
+	} else {
+		devres_free(devres);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(devm_clk_notifier_register);
+
 #ifdef CONFIG_OF
 static void clk_core_reparent_orphans(void)
 {
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 7fd6a1febcf4..79fb52f93053 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -109,6 +109,16 @@ int clk_notifier_register(struct clk *clk, struct notifier_block *nb);
  */
 int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
 
+/**
+ * devm_clk_notifier_register: register a managed rate-change notifier callback
+ * @dev: device for clock "consumer"
+ * @clk: clock whose rate we are interested in
+ * @nb: notifier block with callback function pointer
+ *
+ * Returns 0 on success, -EERROR otherwise
+ */
+int devm_clk_notifier_register(struct device *dev, struct clk *clk, struct notifier_block *nb);
+
 /**
  * clk_get_accuracy - obtain the clock accuracy in ppb (parts per billion)
  *		      for a clock source.
-- 
2.25.4