regulator: Report actual configured voltage to set_voltage()

Change the interface used by set_voltage() to report the selected value
to the regulator core in terms of a selector used by list_voltage().
This allows the regulator core to know the voltage that was chosen
without having to do an explict get_voltage(), which would be much more
expensive as it will generally access hardware.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/regulator/pcap-regulator.c b/drivers/regulator/pcap-regulator.c
index 29d0566379ae..8dca11694f75 100644
--- a/drivers/regulator/pcap-regulator.c
+++ b/drivers/regulator/pcap-regulator.c
@@ -151,7 +151,8 @@ static struct pcap_regulator vreg_table[] = {
 };
 
 static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
-                                                int min_uV, int max_uV)
+                                      int min_uV, int max_uV,
+                                      unsiged *selector)
 {
         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
         void *pcap = rdev_get_drvdata(rdev);
@@ -170,10 +171,12 @@ static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
                         i = 0;
 
                 uV = vreg->voltage_table[i] * 1000;
-                if (min_uV <= uV && uV <= max_uV)
+                if (min_uV <= uV && uV <= max_uV) {
+                        *selector = i;
                         return ezx_pcap_set_bits(pcap, vreg->reg,
                                         (vreg->n_voltages - 1) << vreg->index,
                                         i << vreg->index);
+                }
 
                 if (i == 0 && rdev_get_id(rdev) == V1)
                         i = vreg->n_voltages - 1;