regulator: isl9305: Add Intersil ISL9305/H driver

The ISL9305 and ISL9305H are mini-PMICs offering two DCDC regulators and
two LDO regulators. While there are some register differences between them
these do not affect the current Linux driver as the relevant features are
not yet supported.

Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index e6b98ed..3c8b6f4 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -250,6 +250,12 @@
 	  21 general purpose LDOs, 3 dedicated LDOs, and 5 BUCKs. All
 	  of them come with support to either ECO (idle) or sleep mode.
 
+config REGULATOR_ISL9305
+	tristate "Intersil ISL9305 regulator"
+	depends on I2C
+	help
+	  This driver supports ISL9305 voltage regulator chip.
+
 config REGULATOR_ISL6271A
 	tristate "Intersil ISL6271A Power regulator"
 	depends on I2C