linux-kernel - [PATCH 3/5] mfd: wm5110: Add delay before releasing reset line on cold boot

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Message-Id: <1426525124-12317-3-git-send-email-ckeepax@opensource.wolfsonmicro.com>
Date:	Mon, 16 Mar 2015 16:58:42 +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 3/5] mfd: wm5110: Add delay before releasing reset line on cold boot

On the first boot of the wm5110 it is important the reset line is held
for slightly longer to ensure the device starts up well. This patch adds
a 5mS delay for this.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 8f61ccf..1ecf9f5 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -784,6 +784,15 @@ int arizona_dev_init(struct arizona *arizona)
 		goto err_enable;
 	}
 
+	switch (arizona->type) {
+	case WM5110:
+	case WM8280:
+		msleep(5);
+		break;
+	default:
+		break;
+	}
+
 	if (arizona->pdata.reset) {
 		gpio_set_value_cansleep(arizona->pdata.reset, 1);
 		msleep(1);
-- 
1.7.2.5

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