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fsl-viu: cleanup clock API use 

use devm_clk_get() for automatic put after device close, check for and
propagate errors when enabling clocks, need to prepare clocks before
they can get enabled, adjust code paths to correctly balance get/put and
prepare/unprepare and enable/disable calls

Cc: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Gerhard Sittig <gsi@denx.de>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Gerhard Sittig 2013-07-01 18:54:41 +02:00 committed by Anatolij Gustschin
parent 180890c74d
commit a5d7a6dea6
1 changed files with 13 additions and 10 deletions
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23
drivers/media/platform/fsl-viu.c
View File

@ -1485,6 +1485,7 @@ static int viu_of_probe(struct platform_device *op)
struct viu_reg __iomem *viu_regs;
struct i2c_adapter *ad;
int ret, viu_irq;
struct clk *clk;
ret = of_address_to_resource(op->dev.of_node, 0, &r);
if (ret) {
@ -1577,14 +1578,18 @@ static int viu_of_probe(struct platform_device *op)
}
/* enable VIU clock */
viu_dev->clk = clk_get(&op->dev, "viu_clk");
if (IS_ERR(viu_dev->clk)) {
dev_err(&op->dev, "failed to find the clock module!\n");
ret = -ENODEV;
clk = devm_clk_get(&op->dev, "viu_clk");
if (IS_ERR(clk)) {
dev_err(&op->dev, "failed to lookup the clock!\n");
ret = PTR_ERR(clk);
goto err_clk;
} else {
clk_enable(viu_dev->clk);
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(&op->dev, "failed to enable the clock!\n");
goto err_clk;
}
viu_dev->clk = clk;
/* reset VIU module */
viu_reset(viu_dev->vr);
@ -1602,8 +1607,7 @@ static int viu_of_probe(struct platform_device *op)
return ret;
err_irq:
clk_disable(viu_dev->clk);
clk_put(viu_dev->clk);
clk_disable_unprepare(viu_dev->clk);
err_clk:
video_unregister_device(viu_dev->vdev);
err_vdev:
@ -1626,8 +1630,7 @@ static int viu_of_remove(struct platform_device *op)
free_irq(dev->irq, (void *)dev);
irq_dispose_mapping(dev->irq);
clk_disable(dev->clk);
clk_put(dev->clk);
clk_disable_unprepare(dev->clk);
video_unregister_device(dev->vdev);
i2c_put_adapter(client->adapter);