From cc5380c7d106456122bc68f7d194a14c81b6c1d5 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Fri, 20 Dec 2019 17:44:49 +0100
Subject: [PATCH] regulator: core: Add regulator_is_equal() helper

BugLink: https://bugs.launchpad.net/bugs/1867051

commit b059b7e0ec3208ff1e17cff6387d75a9fbab4e02 upstream.

Add regulator_is_equal() helper to compare whether two regulators are
the same. This is useful for checking whether two separate regulators
in a driver are actually the same supply.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Igor Opaniuk <igor.opaniuk@toradex.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Link: https://lore.kernel.org/r/20191220164450.1395038-1-marex@denx.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
---
 drivers/regulator/helpers.c        | 14 ++++++++++++++
 include/linux/regulator/consumer.h |  7 +++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
index 4986cc5064a1..cf75aac4936c 100644
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -13,6 +13,8 @@
 #include <linux/regulator/driver.h>
 #include <linux/module.h>
 
+#include "internal.h"
+
 /**
  * regulator_is_enabled_regmap - standard is_enabled() for regmap users
  *
@@ -860,3 +862,15 @@ int regulator_get_current_limit_regmap(struct regulator_dev *rdev)
 	return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(regulator_get_current_limit_regmap);
+
+/**
+ * regulator_is_equal - test whether two regulators are the same
+ *
+ * @reg1: first regulator to operate on
+ * @reg2: second regulator to operate on
+ */
+bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
+{
+	return reg1->rdev == reg2->rdev;
+}
+EXPORT_SYMBOL_GPL(regulator_is_equal);
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 815983419375..6250ac91fa5d 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -281,6 +281,8 @@ void devm_regulator_unregister_notifier(struct regulator *regulator,
 void *regulator_get_drvdata(struct regulator *regulator);
 void regulator_set_drvdata(struct regulator *regulator, void *data);
 
+bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2);
+
 #else
 
 /*
@@ -580,6 +582,11 @@ static inline int regulator_list_voltage(struct regulator *regulator, unsigned s
 	return -EINVAL;
 }
 
+static inline bool
+regulator_is_equal(struct regulator *reg1, struct regulator *reg2);
+{
+	return false;
+}
 #endif
 
 static inline int regulator_set_voltage_triplet(struct regulator *regulator,
-- 
2.39.5