regulator: support multiple dummy fixed regulators

Currently regulator_register_fixed() uses a constant name to register a
fixed dummy regulator. This is sufficient in principle, since there is no
reason to register multiple such regulators. The user can simply supply all
consumers in one array and use it to initialise such a regulator. However,
in some cases it can be convenient to register multiple such regulators.
This is also a prerequisite for the upcoming patch, that will add a voltage
parameter to this function. The original function is provided as a wrapper
macro.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 16 insertions, 5 deletions

diff --git a/drivers/regulator/fixed-helper.c b/drivers/regulator/fixed-helper.c
index cacd33c9d042..3aa268dfdb1d 100644
--- a/drivers/regulator/fixed-helper.c
+++ b/drivers/regulator/fixed-helper.c
@@ -1,4 +1,5 @@
 #include <linux/slab.h>
+#include <linux/string.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/fixed.h>
@@ -13,16 +14,18 @@ static void regulator_fixed_release(struct device *dev)
 {
         struct fixed_regulator_data *data = container_of(dev,
                         struct fixed_regulator_data, pdev.dev);
+        kfree(data->cfg.supply_name);
         kfree(data);
 }
 
 /**
- * regulator_register_fixed - register a no-op fixed regulator
+ * regulator_register_fixed_name - register a no-op fixed regulator
  * @id: platform device id
+ * @name: name to be used for the regulator
  * @supplies: consumers for this regulator
  * @num_supplies: number of consumers
  */
-struct platform_device *regulator_register_fixed(int id,
+struct platform_device *regulator_register_always_on(int id, const char *name,
                 struct regulator_consumer_supply *supplies, int num_supplies)
 {
         struct fixed_regulator_data *data;
@@ -31,7 +34,12 @@ struct platform_device *regulator_register_fixed(int id,
         if (!data)
                 return NULL;
 
-        data->cfg.supply_name = "fixed-dummy";
+        data->cfg.supply_name = kstrdup(name, GFP_KERNEL);
+        if (!data->cfg.supply_name) {
+                kfree(data);
+                return NULL;
+        }
+
         data->cfg.microvolts = 0;
         data->cfg.gpio = -EINVAL;
         data->cfg.enabled_at_boot = 1;
diff --git a/include/linux/regulator/fixed.h b/include/linux/regulator/fixed.h
index f83f7440b488..6b9325b5e371 100644
--- a/include/linux/regulator/fixed.h
+++ b/include/linux/regulator/fixed.h
@@ -58,14 +58,17 @@ struct fixed_voltage_config {
 struct regulator_consumer_supply;
 
 #if IS_ENABLED(CONFIG_REGULATOR)
-struct platform_device *regulator_register_fixed(int id,
+struct platform_device *regulator_register_always_on(int id, const char *name,
                 struct regulator_consumer_supply *supplies, int num_supplies);
 #else
-static inline struct platform_device *regulator_register_fixed(int id,
+static inline struct platform_device *regulator_register_always_on(int id, const char *name,
                 struct regulator_consumer_supply *supplies, int num_supplies)
 {
         return NULL;
 }
 #endif
 
+#define regulator_register_fixed(id, s, ns) regulator_register_always_on(id, \
+                                                "fixed-dummy", s, ns)
+
 #endif