linux-kernel - [PATCH v3 02/10] pinctrl: core: add devm_pinctrl_register

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Message-Id: <20250416-aaeon-up-board-pinctrl-support-v3-2-f40776bd06ee@bootlin.com>
Date: Wed, 16 Apr 2025 16:08:10 +0200
From: Thomas Richard <thomas.richard@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Geert Uytterhoeven <geert+renesas@...der.be>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 thomas.petazzoni@...tlin.com, DanieleCleri@...on.eu, GaryWang@...on.com.tw, 
 Thomas Richard <thomas.richard@...tlin.com>
Subject: [PATCH v3 02/10] pinctrl: core: add
 devm_pinctrl_register_mappings()

Using devm_pinctrl_register_mappings(), the core can automatically
unregister pinctrl mappings.

Signed-off-by: Thomas Richard <thomas.richard@...tlin.com>
---
 drivers/pinctrl/core.c          | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/pinctrl/machine.h | 10 ++++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 6dd48dd2c035..f02c45b98512 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1543,6 +1543,43 @@ void pinctrl_unregister_mappings(const struct pinctrl_map *map)
 }
 EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings);
 
+static void devm_pinctrl_unregister_mappings(struct device *dev, void *res)
+{
+	pinctrl_unregister_mappings(*(const struct pinctrl_map **)res);
+}
+
+/**
+ * devm_pinctrl_register_mappings() - Resource managed pinctrl_register_mappings()
+ * @dev: device for which mappings are registered
+ * @maps: the pincontrol mappings table to register. Note the pinctrl-core
+ *	keeps a reference to the passed in maps, so they should _not_ be
+ *	marked with __initdata.
+ * @num_maps: the number of maps in the mapping table
+ */
+int devm_pinctrl_register_mappings(struct device *dev,
+				   const struct pinctrl_map *maps,
+				   unsigned int num_maps)
+{
+	const struct pinctrl_map **ptr;
+	int ret;
+
+	ptr = devres_alloc(devm_pinctrl_unregister_mappings, sizeof(*ptr),
+			   GFP_KERNEL);
+	if (!ptr)
+		return -ENOMEM;
+
+	ret = pinctrl_register_mappings(maps, num_maps);
+	if (!ret) {
+		*ptr = maps;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(devm_pinctrl_register_mappings);
+
 /**
  * pinctrl_force_sleep() - turn a given controller device into sleep state
  * @pctldev: pin controller device
diff --git a/include/linux/pinctrl/machine.h b/include/linux/pinctrl/machine.h
index 673e96df453b..2c178328c468 100644
--- a/include/linux/pinctrl/machine.h
+++ b/include/linux/pinctrl/machine.h
@@ -155,6 +155,9 @@ struct pinctrl_map;
 
 extern int pinctrl_register_mappings(const struct pinctrl_map *map,
 				     unsigned int num_maps);
+extern int devm_pinctrl_register_mappings(struct device *dev,
+					  const struct pinctrl_map *map,
+					  unsigned int num_maps);
 extern void pinctrl_unregister_mappings(const struct pinctrl_map *map);
 extern void pinctrl_provide_dummies(void);
 #else
@@ -165,6 +168,13 @@ static inline int pinctrl_register_mappings(const struct pinctrl_map *map,
 	return 0;
 }
 
+static inline int devm_pinctrl_register_mappings(struct device *dev,
+						 const struct pinctrl_map *map,
+						 unsigned int num_maps)
+{
+	return 0;
+}
+
 static inline void pinctrl_unregister_mappings(const struct pinctrl_map *map)
 {
 }

-- 
2.39.5