linux-kernel - [PATCH] mfd: arizona: Add comment to explain non-devm regulator

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Date:	Thu, 19 Jun 2014 16:04:23 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	lee.jones@...aro.org
Cc:	sameo@...ux.intel.com, patches@...nsource.wolfsonmicro.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: arizona: Add comment to explain non-devm regulator_get

To avoid someone attempting to change this regulator_get back into a
devm_regulator_get put a comment in explaining that devres can't be used
here as the regulator will be destroyed before devres calls
regulator_put.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
---
 drivers/mfd/arizona-core.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 27936fe..b4f22e7 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -683,6 +683,12 @@ int arizona_dev_init(struct arizona *arizona)
 		goto err_early;
 	}
 
+	/**
+	 * Don't use devres here because the only device we have to get
+	 * against is the MFD device and DCVDD will likely be supplied by
+	 * one of its children. Meaning that the regulator will be
+	 * destroyed by the time devres calls regulator put.
+	 */
 	arizona->dcvdd = regulator_get(arizona->dev, "DCVDD");
 	if (IS_ERR(arizona->dcvdd)) {
 		ret = PTR_ERR(arizona->dcvdd);
-- 
1.7.2.5

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