hwrng: mxc-rnga - Use devm_clk_get_enabled() helpers

The devm_clk_get_enabled() helpers:
    - call devm_clk_get()
    - call clk_prepare_enable() and register what is needed in order to
     call clk_disable_unprepare() when needed, as a managed resource.

This simplifies the code and avoids the calls to clk_disable_unprepare().

Signed-off-by: Huan Yang <link@vivo.com>
Reviewed-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/char/hw_random/mxc-rnga.c b/drivers/char/hw_random/mxc-rnga.c
index 94ee18a1120a81647b989213167163d782295b21..f01eb95bee314bc6fdc79a2f4d7c90ea166b1e1d 100644 (file)
--- a/drivers/char/hw_random/mxc-rnga.c
+++ b/drivers/char/hw_random/mxc-rnga.c
@@ -147,33 +147,25 @@ static int mxc_rnga_probe(struct platform_device *pdev)
        mxc_rng->rng.data_present = mxc_rnga_data_present;
        mxc_rng->rng.data_read = mxc_rnga_data_read;
 
-       mxc_rng->clk = devm_clk_get(&pdev->dev, NULL);
+       mxc_rng->clk = devm_clk_get_enabled(&pdev->dev, NULL);
        if (IS_ERR(mxc_rng->clk)) {
                dev_err(&pdev->dev, "Could not get rng_clk!\n");
                return PTR_ERR(mxc_rng->clk);
        }
 
-       err = clk_prepare_enable(mxc_rng->clk);
-       if (err)
-               return err;
-
        mxc_rng->mem = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(mxc_rng->mem)) {
                err = PTR_ERR(mxc_rng->mem);
-               goto err_ioremap;
+               return err;
        }
 
        err = hwrng_register(&mxc_rng->rng);
        if (err) {
                dev_err(&pdev->dev, "MXC RNGA registering failed (%d)\n", err);
-               goto err_ioremap;
+               return err;
        }
 
        return 0;
-
-err_ioremap:
-       clk_disable_unprepare(mxc_rng->clk);
-       return err;
 }
 
 static void mxc_rnga_remove(struct platform_device *pdev)
@@ -181,8 +173,6 @@ static void mxc_rnga_remove(struct platform_device *pdev)
        struct mxc_rng *mxc_rng = platform_get_drvdata(pdev);
 
        hwrng_unregister(&mxc_rng->rng);
-
-       clk_disable_unprepare(mxc_rng->clk);
 }
 
 static const struct of_device_id mxc_rnga_of_match[] = {