Merge branch 'topic/min' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[~shefty/rdma-dev.git] / drivers / regulator / core.c
index 02a249b024b343fd7fa9dadf8a13c36b04c89f27..1c8ff8ce5c57b471bfe4aca908b88ac80038637e 100644 (file)
@@ -1866,6 +1866,28 @@ int regulator_is_enabled(struct regulator *regulator)
 }
 EXPORT_SYMBOL_GPL(regulator_is_enabled);
 
+/**
+ * regulator_can_change_voltage - check if regulator can change voltage
+ * @regulator: regulator source
+ *
+ * Returns positive if the regulator driver backing the source/client
+ * can change its voltage, false otherwise. Usefull for detecting fixed
+ * or dummy regulators and disabling voltage change logic in the client
+ * driver.
+ */
+int regulator_can_change_voltage(struct regulator *regulator)
+{
+       struct regulator_dev    *rdev = regulator->rdev;
+
+       if (rdev->constraints &&
+           rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE &&
+           rdev->desc->n_voltages > 1)
+               return 1;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
+
 /**
  * regulator_count_voltages - count regulator_list_voltage() selectors
  * @regulator: regulator source