From 0dffacbbf8d044456d50c893adb9499775c489f4 Mon Sep 17 00:00:00 2001
From: Sebastian Reichel <sebastian.reichel@collabora.com>
Date: Thu, 20 Feb 2025 19:58:04 +0100
Subject: [PATCH] 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.

Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://patch.msgid.link/20250220-rk3588-gpu-pwr-domain-regulator-v6-1-a4f9c24e5b81@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/regulator/devres.c         | 17 +++++++++++++++++
 drivers/regulator/of_regulator.c   | 21 +++++++++++++++++++++
 include/linux/regulator/consumer.h |  6 ++++++
 3 files changed, 44 insertions(+)

--- a/drivers/regulator/devres.c
+++ b/drivers/regulator/devres.c
@@ -772,6 +772,23 @@ static struct regulator *_devm_of_regula
 }
 
 /**
+ * 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
  * @node: device node for regulator "consumer"
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -698,6 +698,27 @@ struct regulator *_of_regulator_get(stru
 }
 
 /**
+ * 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
  * @node: device node for regulator "consumer"
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -169,6 +169,12 @@ void regulator_put(struct regulator *reg
 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);
