msm: rpm-regulator: Add stubs for rpm_vreg_set_*() APIs on copper

Copper platform clock and acpuclock drivers need to call the
rpm_vreg_set_vdd() API to set vdd_dig and vdd_mem voltages. Until a
full rpm-regulator driver for copper is available, add stub functions
that always return success.

To do this a new MSM_RPM_REGULATOR Kconfig is added.

Change-Id: I0e7c3ab7cd56f7760f0083f4aaac000fdb56d0ec
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
diff --git a/arch/arm/mach-msm/include/mach/rpm-regulator-copper.h b/arch/arm/mach-msm/include/mach/rpm-regulator-copper.h
new file mode 100644
index 0000000..2006ad3
--- /dev/null
+++ b/arch/arm/mach-msm/include/mach/rpm-regulator-copper.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __ARCH_ARM_MACH_MSM_INCLUDE_MACH_RPM_REGULATOR_COPPER_H
+#define __ARCH_ARM_MACH_MSM_INCLUDE_MACH_RPM_REGULATOR_COPPER_H
+
+/**
+ * enum rpm_vreg_id - RPM regulator ID numbers (both real and pin control)
+ */
+enum rpm_vreg_id_copper {
+	RPM_VREG_ID_PM8941_S1,
+	RPM_VREG_ID_PM8941_S2,
+	RPM_VREG_ID_PM8941_L12,
+	RPM_VREG_ID_PM8941_MAX,
+};
+
+#endif