regulator: twl-regulator: make TWL4030_ALLOW_UNSUPPORTED more configurable.

The regulators in the twl4030 can provide some voltage settings
that are not offically supported.
These settings are disabled by default, but can be enabled with
  CONFIG_TWL4030_ALLOW_UNSUPPORTED=y
However
 - that config variable is not mentioned in any Kconfig so cannot
   be used, and
 - a global setting is clumsy - a per regulator setting would be
   better.

So define a new 'feature' flag that a board file can set to enable
these unsupported volatages for boards which need them.

This flag cannot (yet) be set using device-tree.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
index 18fc937c867d..c1be3dba20ea 100644
--- a/include/linux/i2c/twl.h
+++ b/include/linux/i2c/twl.h
@@ -762,6 +762,11 @@ struct twl_regulator_driver_data {
 #define TWL5031                 BIT(2)  /* twl5031 has different registers */
 #define TWL6030_CLASS           BIT(3)  /* TWL6030 class */
 #define TWL6025_SUBCLASS        BIT(4)  /* TWL6025 has changed registers */
+#define TWL4030_ALLOW_UNSUPPORTED BIT(5) /* Some voltages are possible
+                                          * but not officially supported.
+                                          * This flag is necessary to
+                                          * enable them.
+                                          */
 
 /*----------------------------------------------------------------------*/