regulator: Add option for machine drivers to enable the dummy regulator

Allow machine drivers to explicitly enable the use of the dummy regulator,
enabling simpler support for systems with only a few specific supplies
visible to software.

It is strongly recommended that this is not used on systems with
substantial software control over their PMICs, for maximum functionality
constrints should be as fully specified as possible.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

2 files changed, 23 insertions, 2 deletions

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 6cae6419b8b1..bff815736780 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -3,14 +3,13 @@
 #
 
 
-obj-$(CONFIG_REGULATOR) += core.o
+obj-$(CONFIG_REGULATOR) += core.o dummy.o
 obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
 obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
 obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
 
 obj-$(CONFIG_REGULATOR_AD5398) += ad5398.o
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
-obj-$(CONFIG_REGULATOR_DUMMY) += dummy.o
 obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
 obj-$(CONFIG_REGULATOR_LP3972) += lp3972.o
 obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cc8b337b9119..4fa08c85f3ce 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -33,6 +33,7 @@ static DEFINE_MUTEX(regulator_list_mutex);
 static LIST_HEAD(regulator_list);
 static LIST_HEAD(regulator_map_list);
 static int has_full_constraints;
+static bool board_wants_dummy_regulator;
 
 /*
  * struct regulator_map
@@ -1108,6 +1109,11 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
                 }
         }
 
+        if (board_wants_dummy_regulator) {
+                rdev = dummy_regulator_rdev;
+                goto found;
+        }
+
 #ifdef CONFIG_REGULATOR_DUMMY
         if (!devname)
                 devname = "deviceless";
@@ -2463,6 +2469,22 @@ void regulator_has_full_constraints(void)
 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
 
 /**
+ * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
+ *
+ * Calling this function will cause the regulator API to provide a
+ * dummy regulator to consumers if no physical regulator is found,
+ * allowing most consumers to proceed as though a regulator were
+ * configured.  This allows systems such as those with software
+ * controllable regulators for the CPU core only to be brought up more
+ * readily.
+ */
+void regulator_use_dummy_regulator(void)
+{
+        board_wants_dummy_regulator = true;
+}
+EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
+
+/**
  * rdev_get_drvdata - get rdev regulator driver data
  * @rdev: regulator
  *