Add a bare-minimum Regulator abstraction

Merge series from Daniel Almeida <[email protected]>:

Add basic rust bindings for the regulator API.

Author: broonie

MAINTAINERS

@@ -26561,6 +26561,7 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git
 F:	Documentation/devicetree/bindings/regulator/
 F:	Documentation/power/regulator/
 F:	drivers/regulator/
+F:	rust/kernel/regulator.rs
 F:	include/dt-bindings/regulator/
 F:	include/linux/regulator/
 K:	regulator_get_optional

rust/bindings/bindings_helper.h

@@ -65,6 +65,7 @@
 #include <linux/poll.h>
 #include <linux/property.h>
 #include <linux/refcount.h>
+#include <linux/regulator/consumer.h>
 #include <linux/sched.h>
 #include <linux/security.h>
 #include <linux/slab.h>

rust/helpers/helpers.c

@@ -33,6 +33,7 @@
 #include "pci.c"
 #include "pid_namespace.c"
 #include "rbtree.c"
+#include "regulator.c"
 #include "rcu.c"
 #include "refcount.c"
 #include "security.c"

rust/helpers/regulator.c

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/regulator/consumer.h>
+
+#ifndef CONFIG_REGULATOR
+
+void rust_helper_regulator_put(struct regulator *regulator)
+{
+	regulator_put(regulator);
+}
+
+int rust_helper_regulator_set_voltage(struct regulator *regulator, int min_uV,
+				      int max_uV)
+{
+	return regulator_set_voltage(regulator, min_uV, max_uV);
+}
+
+int rust_helper_regulator_get_voltage(struct regulator *regulator)
+{
+	return regulator_get_voltage(regulator);
+}
+
+struct regulator *rust_helper_regulator_get(struct device *dev, const char *id)
+{
+	return regulator_get(dev, id);
+}
+
+int rust_helper_regulator_enable(struct regulator *regulator)
+{
+	return regulator_enable(regulator);
+}
+
+int rust_helper_regulator_disable(struct regulator *regulator)
+{
+	return regulator_disable(regulator);
+}
+
+int rust_helper_regulator_is_enabled(struct regulator *regulator)
+{
+	return regulator_is_enabled(regulator);
+}
+
+#endif

rust/kernel/lib.rs

@@ -100,6 +100,7 @@ pub mod platform;
 pub mod prelude;
 pub mod print;
 pub mod rbtree;
+pub mod regulator;
 pub mod revocable;
 pub mod security;
 pub mod seq_file;