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hwrng: exynos - Use devm_clk_get_enabled() to get the clock

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Use devm_clk_get_enabled() helper instead of calling devm_clk_get() and
then clk_prepare_enable(). It simplifies the error handling and makes
the code more compact. Also use dev_err_probe() to handle possible
-EPROBE_DEFER errors if the clock is not available yet.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Sam Protsenko 2024-06-20 18:13:36 -05:00 committed by Herbert Xu
parent 76536caabe
commit 81da8056e9
1 changed files with 4 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/char/hw_random/exynos-trng.c
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@ -134,32 +134,23 @@ static int exynos_trng_probe(struct platform_device *pdev)
goto err_pm_get;
}
trng->clk = devm_clk_get(&pdev->dev, "secss");
trng->clk = devm_clk_get_enabled(&pdev->dev, "secss");
if (IS_ERR(trng->clk)) {
ret = PTR_ERR(trng->clk);
dev_err(&pdev->dev, "Could not get clock.\n");
goto err_clock;
}
ret = clk_prepare_enable(trng->clk);
if (ret) {
dev_err(&pdev->dev, "Could not enable the clk.\n");
ret = dev_err_probe(&pdev->dev, PTR_ERR(trng->clk),
"Could not get clock\n");
goto err_clock;
}
ret = devm_hwrng_register(&pdev->dev, &trng->rng);
if (ret) {
dev_err(&pdev->dev, "Could not register hwrng device.\n");
goto err_register;
goto err_clock;
}
dev_info(&pdev->dev, "Exynos True Random Number Generator.\n");
return 0;
err_register:
clk_disable_unprepare(trng->clk);
err_clock:
pm_runtime_put_noidle(&pdev->dev);
@ -171,10 +162,6 @@ err_pm_get:
static void exynos_trng_remove(struct platform_device *pdev)
{
struct exynos_trng_dev *trng = platform_get_drvdata(pdev);
clk_disable_unprepare(trng->clk);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
}