mfd: Add HI6421 PMIC Core driver

This adds driver to support HiSilicon Hi6421 PMIC. Hi6421 includes multi-
functions, such as regulators, codec, ADCs, Coulomb counter, etc.
This driver includes core APIs _only_.

Drivers for individul components, like voltage regulators, are
implemented in corresponding driver directories and files.

Registers in Hi6421 are memory mapped, so using regmap-mmio API.

Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 049796a28215..609b7a2144d6 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -210,6 +210,19 @@ config MFD_MC13XXX_I2C
         help
           Select this if your MC13xxx is connected via an I2C bus.
 
+config MFD_HI6421_PMIC
+        tristate "HiSilicon Hi6421 PMU/Codec IC"
+        depends on OF
+        select MFD_CORE
+        select REGMAP_MMIO
+        help
+          Add support for HiSilicon Hi6421 PMIC. Hi6421 includes multi-
+          functions, such as regulators, RTC, codec, Coulomb counter, etc.
+          This driver includes core APIs _only_. You have to select
+          individul components like voltage regulators under corresponding
+          menus in order to enable them.
+          We communicate with the Hi6421 via memory-mapped I/O.
+
 config HTC_EGPIO
         bool "HTC EGPIO support"
         depends on GPIOLIB && ARM