From ca76ceb8b9ca1466be9b6de5e4c0fb19b37417ee Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Tue, 9 Apr 2013 16:04:35 +0100
Subject: [PATCH] mfd: arizona: Read the device identification information
 after boot

Future devices may not fully report the device identification information
until their boot sequence is complete so defer acting on these until that
has finished.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c | 80 +++++++++++++++++++++++---------------
 1 file changed, 49 insertions(+), 31 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 6ab03043fd60..81907f9fc92e 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -536,51 +536,22 @@ int arizona_dev_init(struct arizona *arizona)
 
 	regcache_cache_only(arizona->regmap, false);
 
+	/* Verify that this is a chip we know about */
 	ret = regmap_read(arizona->regmap, ARIZONA_SOFTWARE_RESET, &reg);
 	if (ret != 0) {
 		dev_err(dev, "Failed to read ID register: %d\n", ret);
 		goto err_reset;
 	}
 
-	ret = regmap_read(arizona->regmap, ARIZONA_DEVICE_REVISION,
-			  &arizona->rev);
-	if (ret != 0) {
-		dev_err(dev, "Failed to read revision register: %d\n", ret);
-		goto err_reset;
-	}
-	arizona->rev &= ARIZONA_DEVICE_REVISION_MASK;
-
 	switch (reg) {
-#ifdef CONFIG_MFD_WM5102
 	case 0x5102:
-		type_name = "WM5102";
-		if (arizona->type != WM5102) {
-			dev_err(arizona->dev, "WM5102 registered as %d\n",
-				arizona->type);
-			arizona->type = WM5102;
-		}
-		apply_patch = wm5102_patch;
-		arizona->rev &= 0x7;
-		break;
-#endif
-#ifdef CONFIG_MFD_WM5110
 	case 0x5110:
-		type_name = "WM5110";
-		if (arizona->type != WM5110) {
-			dev_err(arizona->dev, "WM5110 registered as %d\n",
-				arizona->type);
-			arizona->type = WM5110;
-		}
-		apply_patch = wm5110_patch;
 		break;
-#endif
 	default:
-		dev_err(arizona->dev, "Unknown device ID %x\n", reg);
+		dev_err(arizona->dev, "Unknown device ID: %x\n", reg);
 		goto err_reset;
 	}
 
-	dev_info(dev, "%s revision %c\n", type_name, arizona->rev + 'A');
-
 	/* If we have a /RESET GPIO we'll already be reset */
 	if (!arizona->pdata.reset) {
 		regcache_mark_dirty(arizona->regmap);
@@ -600,6 +571,7 @@ int arizona_dev_init(struct arizona *arizona)
 		}
 	}
 
+	/* Ensure device startup is complete */
 	switch (arizona->type) {
 	case WM5102:
 		ret = regmap_read(arizona->regmap, 0x19, &val);
@@ -620,6 +592,52 @@ int arizona_dev_init(struct arizona *arizona)
 		break;
 	}
 
+	/* Read the device ID information & do device specific stuff */
+	ret = regmap_read(arizona->regmap, ARIZONA_SOFTWARE_RESET, &reg);
+	if (ret != 0) {
+		dev_err(dev, "Failed to read ID register: %d\n", ret);
+		goto err_reset;
+	}
+
+	ret = regmap_read(arizona->regmap, ARIZONA_DEVICE_REVISION,
+			  &arizona->rev);
+	if (ret != 0) {
+		dev_err(dev, "Failed to read revision register: %d\n", ret);
+		goto err_reset;
+	}
+	arizona->rev &= ARIZONA_DEVICE_REVISION_MASK;
+
+	switch (reg) {
+#ifdef CONFIG_MFD_WM5102
+	case 0x5102:
+		type_name = "WM5102";
+		if (arizona->type != WM5102) {
+			dev_err(arizona->dev, "WM5102 registered as %d\n",
+				arizona->type);
+			arizona->type = WM5102;
+		}
+		apply_patch = wm5102_patch;
+		arizona->rev &= 0x7;
+		break;
+#endif
+#ifdef CONFIG_MFD_WM5110
+	case 0x5110:
+		type_name = "WM5110";
+		if (arizona->type != WM5110) {
+			dev_err(arizona->dev, "WM5110 registered as %d\n",
+				arizona->type);
+			arizona->type = WM5110;
+		}
+		apply_patch = wm5110_patch;
+		break;
+#endif
+	default:
+		dev_err(arizona->dev, "Unknown device ID %x\n", reg);
+		goto err_reset;
+	}
+
+	dev_info(dev, "%s revision %c\n", type_name, arizona->rev + 'A');
+
 	if (apply_patch) {
 		ret = apply_patch(arizona);
 		if (ret != 0) {
-- 
2.34.1