[PATCH] mfd: arizona: Add comment to explain non-devm regulator_get

Charles Keepax
2014-06-19T15:13:19Z

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@opensource.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