regulator: ltc3589: Fix module dependency

Make this driver depend on I2C and select REGMAP_I2C to fix build failure.
Also allows this driver to be built as module.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 5599a61bd88c..4c12caba37ee 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -266,7 +266,9 @@ config REGULATOR_LP8788
           This driver supports LP8788 voltage regulator chip.
 
 config REGULATOR_LTC3589
-        bool "LTC3589 8-output voltage regulator"
+        tristate "LTC3589 8-output voltage regulator"
+        depends on I2C
+        select REGMAP_I2C
         help
           This enables support for the LTC3589, LTC3589-1, and LTC3589-2
           8-output regulators controlled via I2C.