linux-kernel - [PATCH v4 1/7] regulator: Add (devm_)of_regulator

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Message-ID: <20241210171023.141162-2-sebastian.reichel@collabora.com>
Date: Tue, 10 Dec 2024 18:06:41 +0100
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Mark Brown <broonie@...nel.org>
Cc: Liam Girdwood <lgirdwood@...il.com>,
	Elaine Zhang <zhangqing@...k-chips.com>,
	Adrián Martínez Larumbe <adrian.larumbe@...labora.com>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Chen-Yu Tsai <wens@...e.org>,
	devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	kernel@...labora.com
Subject: [PATCH v4 1/7] regulator: Add (devm_)of_regulator_get()

The Rockchip power-domain controller also plans to make use of
per-domain regulators similar to the MediaTek power-domain controller.
Since existing DTs are missing the regulator information, the kernel
should fallback to the automatically created dummy regulator if
necessary. Thus the version without the _optional suffix is needed.

The Rockchip driver plans to use the managed version, but to be
consistent with existing code the unmanaged version is added at the
same time.

Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
 drivers/regulator/devres.c         | 17 +++++++++++++++++
 drivers/regulator/of_regulator.c   | 21 +++++++++++++++++++++
 include/linux/regulator/consumer.h |  6 ++++++
 3 files changed, 44 insertions(+)

diff --git a/drivers/regulator/devres.c b/drivers/regulator/devres.c
index 36164aec30e8..a3a3ccc711fc 100644
--- a/drivers/regulator/devres.c
+++ b/drivers/regulator/devres.c
@@ -771,6 +771,23 @@ static struct regulator *_devm_of_regulator_get(struct device *dev, struct devic
 	return regulator;
 }
 
+/**
+ * devm_of_regulator_get - Resource managed of_regulator_get()
+ * @dev: device used for dev_printk() messages and resource lifetime management
+ * @node: device node for regulator "consumer"
+ * @id:  supply name or regulator ID.
+ *
+ * Managed of_regulator_get(). Regulators returned from this
+ * function are automatically regulator_put() on driver detach. See
+ * of_regulator_get() for more information.
+ */
+struct regulator *devm_of_regulator_get(struct device *dev, struct device_node *node,
+						 const char *id)
+{
+	return _devm_of_regulator_get(dev, node, id, NORMAL_GET);
+}
+EXPORT_SYMBOL_GPL(devm_of_regulator_get);
+
 /**
  * devm_of_regulator_get_optional - Resource managed of_regulator_get_optional()
  * @dev: device used for dev_printk() messages and resource lifetime management
diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index 3d85762beda6..31a5bacd99b4 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -682,6 +682,27 @@ struct regulator *_of_regulator_get(struct device *dev, struct device_node *node
 	return _regulator_get_common(r, dev, id, get_type);
 }
 
+/**
+ * of_regulator_get - get regulator via device tree lookup
+ * @dev: device used for dev_printk() messages
+ * @node: device node for regulator "consumer"
+ * @id: Supply name
+ *
+ * Return: pointer to struct regulator corresponding to the regulator producer,
+ *	   or PTR_ERR() encoded error number.
+ *
+ * This is intended for use by consumers that want to get a regulator
+ * supply directly from a device node. This will _not_ consider supply
+ * aliases. See regulator_dev_lookup().
+ */
+struct regulator *of_regulator_get(struct device *dev,
+					    struct device_node *node,
+					    const char *id)
+{
+	return _of_regulator_get(dev, node, id, NORMAL_GET);
+}
+EXPORT_SYMBOL_GPL(of_regulator_get);
+
 /**
  * of_regulator_get_optional - get optional regulator via device tree lookup
  * @dev: device used for dev_printk() messages
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 8c3c372ad735..5903ae7444ae 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -169,6 +169,12 @@ void regulator_put(struct regulator *regulator);
 void devm_regulator_put(struct regulator *regulator);
 
 #if IS_ENABLED(CONFIG_OF)
+struct regulator *__must_check of_regulator_get(struct device *dev,
+						struct device_node *node,
+						const char *id);
+struct regulator *__must_check devm_of_regulator_get(struct device *dev,
+						     struct device_node *node,
+						     const char *id);
 struct regulator *__must_check of_regulator_get_optional(struct device *dev,
 							 struct device_node *node,
 							 const char *id);
-- 
2.45.2