linux-kernel - [PATCH 5/5] mfd: wm5110: Set DCVDD voltage to 1.175V before entering sleep mode

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Message-Id: <1426525124-12317-5-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:	Mon, 16 Mar 2015 16:58:44 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	lee.jones@...aro.org, broonie@...nel.org
Cc:	sameo@...ux.intel.com, lgirdwood@...il.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] 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@...nsource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 1ecf9f5..aa1bd77 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -407,6 +407,32 @@ static int arizona_runtime_resume(struct device *dev)
 			goto err;
 		}
 		break;
+	case WM5110:
+	case WM8280:
+		ret = arizona_wait_for_boot(arizona);
+		if (ret != 0)
+			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;
+			}
+		} else {
+			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) {
@@ -457,6 +483,22 @@ static int arizona_runtime_suspend(struct device *dev)
 				ret);
 			return ret;
 		}
+	} else {
+		switch (arizona->type) {
+		case WM5110:
+		case WM8280:
+			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);
-- 
1.7.2.5

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