mfd: wm5110: Set DCVDD voltage to 1.175V before entering sleep mode

The low power sleep mode on wm5110 requires that the LDO1 regulator be
set to 1.175V prior to entering sleep, then returned to 1.2V after
exiting sleep mode. This patch apply these regulator settings.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index c80ab791061541e64234c77a910dad3d16716ccf..93024acc145ecde9cf492ca03781639ef8685b8c 100644 (file)
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -478,6 +478,37 @@ static int arizona_runtime_resume(struct device *dev)
                        goto err;
                }
                break;
+       case WM5110:
+       case WM8280:
+               ret = arizona_wait_for_boot(arizona);
+               if (ret)
+                       goto err;
+
+               if (arizona->external_dcvdd) {
+                       ret = regmap_update_bits(arizona->regmap,
+                                                ARIZONA_ISOLATION_CONTROL,
+                                                ARIZONA_ISOLATE_DCVDD1, 0);
+                       if (ret) {
+                               dev_err(arizona->dev,
+                                       "Failed to connect DCVDD: %d\n", ret);
+                               goto err;
+                       }
+               } else {
+                       /*
+                        * As this is only called for the internal regulator
+                        * (where we know voltage ranges available) it is ok
+                        * to request an exact range.
+                        */
+                       ret = regulator_set_voltage(arizona->dcvdd,
+                                                   1200000, 1200000);
+                       if (ret < 0) {
+                               dev_err(arizona->dev,
+                                       "Failed to set resume voltage: %d\n",
+                                       ret);
+                               goto err;
+                       }
+               }
+               break;
        default:
                ret = arizona_wait_for_boot(arizona);
                if (ret != 0) {
@@ -528,6 +559,27 @@ static int arizona_runtime_suspend(struct device *dev)
                                ret);
                        return ret;
                }
+       } else {
+               switch (arizona->type) {
+               case WM5110:
+               case WM8280:
+                       /*
+                        * As this is only called for the internal regulator
+                        * (where we know voltage ranges available) it is ok
+                        * to request an exact range.
+                        */
+                       ret = regulator_set_voltage(arizona->dcvdd,
+                                                   1175000, 1175000);
+                       if (ret < 0) {
+                               dev_err(arizona->dev,
+                                       "Failed to set suspend voltage: %d\n",
+                                       ret);
+                               return ret;
+                       }
+                       break;
+               default:
+                       break;
+               }
        }
 
        regcache_cache_only(arizona->regmap, true);