diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/amba/bus.c | 39 |
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; } |