linux-kernel - [RFC PATCH v4 1/4] clk: gate: Add devm_clk_hw_register

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Date:   Wed, 3 Nov 2021 09:50:59 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <mturquette@...libre.com>, <sboyd@...nel.org>,
        <robh+dt@...nel.org>, <kavyasree.kotagiri@...rochip.com>,
        <nicolas.ferre@...rochip.com>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [RFC PATCH v4 1/4] clk: gate: Add devm_clk_hw_register_gate()

Add devm_clk_hw_register_gate() - devres-managed version of
clk_hw_register_gate()

Suggested-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/clk/clk-gate.c       | 35 +++++++++++++++++++++++++++++++++++
 include/linux/clk-provider.h | 23 +++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index 070dc47e95a1..64283807600b 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/clk-provider.h>
+#include <linux/device.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/io.h>
@@ -222,3 +223,37 @@ void clk_hw_unregister_gate(struct clk_hw *hw)
 	kfree(gate);
 }
 EXPORT_SYMBOL_GPL(clk_hw_unregister_gate);
+
+static void devm_clk_hw_release_gate(struct device *dev, void *res)
+{
+	clk_hw_unregister_gate(*(struct clk_hw **)res);
+}
+
+struct clk_hw *__devm_clk_hw_register_gate(struct device *dev,
+		struct device_node *np, const char *name,
+		const char *parent_name, const struct clk_hw *parent_hw,
+		const struct clk_parent_data *parent_data,
+		unsigned long flags,
+		void __iomem *reg, u8 bit_idx,
+		u8 clk_gate_flags, spinlock_t *lock)
+{
+	struct clk_hw **ptr, *hw;
+
+	ptr = devres_alloc(devm_clk_hw_release_gate, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return ERR_PTR(-ENOMEM);
+
+	hw = __clk_hw_register_gate(dev, np, name, parent_name, parent_hw,
+				    parent_data, flags, reg, bit_idx,
+				    clk_gate_flags, lock);
+
+	if (!IS_ERR(hw)) {
+		*ptr = hw;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return hw;
+}
+EXPORT_SYMBOL_GPL(__devm_clk_hw_register_gate);
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index f59c875271a0..2faa6f7aa8a8 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -490,6 +490,13 @@ struct clk_hw *__clk_hw_register_gate(struct device *dev,
 		unsigned long flags,
 		void __iomem *reg, u8 bit_idx,
 		u8 clk_gate_flags, spinlock_t *lock);
+struct clk_hw *__devm_clk_hw_register_gate(struct device *dev,
+		struct device_node *np, const char *name,
+		const char *parent_name, const struct clk_hw *parent_hw,
+		const struct clk_parent_data *parent_data,
+		unsigned long flags,
+		void __iomem *reg, u8 bit_idx,
+		u8 clk_gate_flags, spinlock_t *lock);
 struct clk *clk_register_gate(struct device *dev, const char *name,
 		const char *parent_name, unsigned long flags,
 		void __iomem *reg, u8 bit_idx,
@@ -544,6 +551,22 @@ struct clk *clk_register_gate(struct device *dev, const char *name,
 	__clk_hw_register_gate((dev), NULL, (name), NULL, NULL, (parent_data), \
 			       (flags), (reg), (bit_idx),		      \
 			       (clk_gate_flags), (lock))
+/**
+ * devm_clk_hw_register_gate - register a gate clock with the clock framework
+ * @dev: device that is registering this clock
+ * @name: name of this clock
+ * @parent_name: name of this clock's parent
+ * @flags: framework-specific flags for this clock
+ * @reg: register address to control gating of this clock
+ * @bit_idx: which bit in the register controls gating of this clock
+ * @clk_gate_flags: gate-specific flags for this clock
+ * @lock: shared register lock for this clock
+ */
+#define devm_clk_hw_register_gate(dev, name, parent_name, flags, reg, bit_idx,\
+				  clk_gate_flags, lock)			      \
+	__devm_clk_hw_register_gate((dev), NULL, (name), (parent_name), NULL, \
+			       NULL, (flags), (reg), (bit_idx),		      \
+			       (clk_gate_flags), (lock))
 void clk_unregister_gate(struct clk *clk);
 void clk_hw_unregister_gate(struct clk_hw *hw);
 int clk_gate_is_enabled(struct clk_hw *hw);
-- 
2.33.0