regulator: AB3100 support

This adds support for the regulators found in the AB3100
Mixed-Signal IC.

It further also defines platform data for the ST-Ericsson
U300 platform and extends the AB3100 MFD driver so that
platform/board data with regulation constraints and an init
function can be passed down all the way from the board to
the regulators.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/ab3100-core.c

@@ -837,6 +837,8 @@ static int __init ab3100_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct ab3100 *ab3100;
+	struct ab3100_platform_data *ab3100_plf_data =
+		client->dev.platform_data;
 	int err;
 	int i;
 
@@ -920,6 +922,8 @@ static int __init ab3100_probe(struct i2c_client *client,
 	for (i = 0; i < ARRAY_SIZE(ab3100_platform_devs); i++) {
 		ab3100_platform_devs[i]->dev.parent =
 			&client->dev;
+		ab3100_platform_devs[i]->dev.platform_data =
+			ab3100_plf_data;
 		platform_set_drvdata(ab3100_platform_devs[i], ab3100);
 	}