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>

diff --git a/drivers/media/platform/fsl-viu.c b/drivers/media/platform/fsl-viu.c
index 221ec428a01e75d0508f83660a92d9a53f6fdc5a..fe9898ca3c84465aec0e345abdd1e2b9c5d0e55f 100644 (file)
--- a/drivers/media/platform/fsl-viu.c
+++ b/drivers/media/platform/fsl-viu.c
@@ -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;
+       }
+       ret = clk_prepare_enable(clk);
+       if (ret) {
+               dev_err(&op->dev, "failed to enable the clock!\n");
                goto err_clk;
-       } else {
-               clk_enable(viu_dev->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);