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path: root/drivers/amba/bus.c
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Diffstat (limited to 'drivers/amba/bus.c')
-rw-r--r--drivers/amba/bus.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 2737b9752205..e7df019d29d4 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -147,6 +147,39 @@ static void amba_put_disable_pclk(struct amba_device *pcdev)
clk_put(pclk);
}
+static int amba_get_enable_vcore(struct amba_device *pcdev)
+{
+ struct regulator *vcore = regulator_get(&pcdev->dev, "vcore");
+ int ret;
+
+ pcdev->vcore = vcore;
+
+ if (IS_ERR(vcore)) {
+ /* It is OK not to supply a vcore regulator */
+ if (PTR_ERR(vcore) == -ENODEV)
+ return 0;
+ return PTR_ERR(vcore);
+ }
+
+ ret = regulator_enable(vcore);
+ if (ret) {
+ regulator_put(vcore);
+ pcdev->vcore = ERR_PTR(-ENODEV);
+ }
+
+ return ret;
+}
+
+static void amba_put_disable_vcore(struct amba_device *pcdev)
+{
+ struct regulator *vcore = pcdev->vcore;
+
+ if (!IS_ERR(vcore)) {
+ regulator_disable(vcore);
+ regulator_put(vcore);
+ }
+}
+
/*
* These are the device model conversion veneers; they convert the
* device model structures to our more specific structures.
@@ -159,6 +192,10 @@ static int amba_probe(struct device *dev)
int ret;
do {
+ ret = amba_get_enable_vcore(pcdev);
+ if (ret)
+ break;
+
ret = amba_get_enable_pclk(pcdev);
if (ret)
break;
@@ -168,6 +205,7 @@ static int amba_probe(struct device *dev)
break;
amba_put_disable_pclk(pcdev);
+ amba_put_disable_vcore(pcdev);
} while (0);
return ret;
@@ -180,6 +218,7 @@ static int amba_remove(struct device *dev)
int ret = drv->remove(pcdev);
amba_put_disable_pclk(pcdev);
+ amba_put_disable_vcore(pcdev);
return ret;
}