From 5927467d0ca274bc3b8eed9fd5db964bbde56e1c Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Tue, 23 Apr 2013 19:44:16 +0100
Subject: [PATCH] mfd: arizona: Support use of external DCVDD

When the device is used with an external DCVDD supply instead of the
internal LDO1 then an extra step is required when suspending and resuming
the device.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c       | 43 ++++++++++++++++++++++++++++++++
 include/linux/mfd/arizona/core.h |  2 ++
 2 files changed, 45 insertions(+)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index d8d30c0a488d..437f199fe5f2 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -22,6 +22,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <linux/regulator/machine.h>
 #include <linux/slab.h>
 
 #include <linux/mfd/arizona/core.h>
@@ -347,6 +348,17 @@ static int arizona_runtime_resume(struct device *dev)
 
 	switch (arizona->type) {
 	case WM5102:
+		if (arizona->external_dcvdd) {
+			ret = regmap_update_bits(arizona->regmap,
+						 ARIZONA_ISOLATION_CONTROL,
+						 ARIZONA_ISOLATE_DCVDD1, 0);
+			if (ret != 0) {
+				dev_err(arizona->dev,
+					"Failed to connect DCVDD: %d\n", ret);
+				goto err;
+			}
+		}
+
 		ret = wm5102_patch(arizona);
 		if (ret != 0) {
 			dev_err(arizona->dev, "Failed to apply patch: %d\n",
@@ -368,6 +380,16 @@ static int arizona_runtime_resume(struct device *dev)
 			goto err;
 		}
 
+		if (arizona->external_dcvdd) {
+			ret = regmap_update_bits(arizona->regmap,
+						 ARIZONA_ISOLATION_CONTROL,
+						 ARIZONA_ISOLATE_DCVDD1, 0);
+			if (ret != 0) {
+				dev_err(arizona->dev,
+					"Failed to connect DCVDD: %d\n", ret);
+				goto err;
+			}
+		}
 		break;
 	}
 
@@ -400,9 +422,22 @@ err:
 static int arizona_runtime_suspend(struct device *dev)
 {
 	struct arizona *arizona = dev_get_drvdata(dev);
+	int ret;
 
 	dev_dbg(arizona->dev, "Entering AoD mode\n");
 
+	if (arizona->external_dcvdd) {
+		ret = regmap_update_bits(arizona->regmap,
+					 ARIZONA_ISOLATION_CONTROL,
+					 ARIZONA_ISOLATE_DCVDD1,
+					 ARIZONA_ISOLATE_DCVDD1);
+		if (ret != 0) {
+			dev_err(arizona->dev, "Failed to isolate DCVDD: %d\n",
+				ret);
+			return ret;
+		}
+	}
+
 	regulator_disable(arizona->dcvdd);
 	regcache_cache_only(arizona->regmap, true);
 	regcache_mark_dirty(arizona->regmap);
@@ -771,6 +806,14 @@ int arizona_dev_init(struct arizona *arizona)
 			     arizona->pdata.gpio_defaults[i]);
 	}
 
+	/*
+	 * LDO1 can only be used to supply DCVDD so if it has no
+	 * consumers then DCVDD is supplied externally.
+	 */
+	if (arizona->pdata.ldo1 &&
+	    arizona->pdata.ldo1->num_consumer_supplies == 0)
+		arizona->external_dcvdd = true;
+
 	pm_runtime_set_autosuspend_delay(arizona->dev, 100);
 	pm_runtime_use_autosuspend(arizona->dev);
 	pm_runtime_enable(arizona->dev);
diff --git a/include/linux/mfd/arizona/core.h b/include/linux/mfd/arizona/core.h
index cc281368dc55..f797bb9b8b56 100644
--- a/include/linux/mfd/arizona/core.h
+++ b/include/linux/mfd/arizona/core.h
@@ -95,6 +95,8 @@ struct arizona {
 
 	struct arizona_pdata pdata;
 
+	unsigned int external_dcvdd:1;
+
 	int irq;
 	struct irq_domain *virq;
 	struct regmap_irq_chip_data *aod_irq_chip;