regulator: cpcap: Add basic regulator support

Many Motorola phones like droid 4 are using a custom PMIC called CPCAP
or 6556002. This PMIC is used with several SoCs, I've noticed at least
omap3, omap4 and Tegra2 based Motorola phones and tablets using it.

Cc: devicetree@vger.kernel.org
Cc: Marcel Partap <mpartap@gmx.net>
Cc: Michael Scott <michael.scott@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/cpcap-regulator.txt

+Motorola CPCAP PMIC voltage regulators
+------------------------------------
+
+Requires node properties:
+- "compatible" value one of:
+    "motorola,cpcap-regulator"
+    "motorola,mapphone-cpcap-regulator"
+
+Required regulator properties:
+- "regulator-name"
+- "regulator-enable-ramp-delay"
+- "regulator-min-microvolt"
+- "regulator-max-microvolt"
+
+Optional regulator properties:
+- "regulator-boot-on"
+
+See Documentation/devicetree/bindings/regulator/regulator.txt
+for more details about the regulator properties.
+
+Example:
+
+cpcap_regulator: regulator {
+	compatible = "motorola,cpcap-regulator";
+
+	cpcap_regulators: regulators {
+		sw5: SW5 {
+			regulator-min-microvolt = <5050000>;
+			regulator-max-microvolt = <5050000>;
+			regulator-enable-ramp-delay = <50000>;
+			regulator-boot-on;
+		};
+	};
+};

drivers/regulator/Kconfig

@@ -163,6 +163,13 @@ config REGULATOR_BCM590XX
 	  BCM590xx PMUs. This will enable support for the software
 	  controllable LDO/Switching regulators.
 
+config REGULATOR_CPCAP
+	tristate "Motorola CPCAP regulator"
+	depends on MFD_CPCAP
+	help
+	  Say y here for CPCAP regulator found on some Motorola phones
+	  and tablets such as Droid 4.
+
 config REGULATOR_DA903X
 	tristate "Dialog Semiconductor DA9030/DA9034 regulators"
 	depends on PMIC_DA903X

drivers/regulator/Makefile

@@ -11,6 +11,7 @@ obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
 
 obj-$(CONFIG_REGULATOR_88PM800) += 88pm800.o
 obj-$(CONFIG_REGULATOR_88PM8607) += 88pm8607.o
+obj-$(CONFIG_REGULATOR_CPCAP) += cpcap-regulator.o
 obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
 obj-$(CONFIG_REGULATOR_AB3100) += ab3100.o
 obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500-ext.o ab8500.o