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From:   =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= 
        <u.kleine-koenig@pengutronix.de>
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        Russell King <linux@armlinux.org.uk>,
        Matt Mackall <mpm@selenic.com>,
        Herbert Xu <herbert@gondor.apana.org.au>
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        Neil Armstrong <narmstrong@baylibre.com>,
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        Jerome Brunet <jbrunet@baylibre.com>,
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        linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org
Subject: [PATCH v8 05/16] hwrng: meson - Don't open-code devm_clk_get_optional_enabled()
Date:   Mon, 14 Mar 2022 15:16:32 +0100
Message-Id: <20220314141643.22184-6-u.kleine-koenig@pengutronix.de>
In-Reply-To: <20220314141643.22184-1-u.kleine-koenig@pengutronix.de>
References: <20220314141643.22184-1-u.kleine-koenig@pengutronix.de>
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devm_clk_get_enabled() returns a clock prepared and enabled and already
registers a devm exit handler to disable (and unprepare) the clock.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/char/hw_random/meson-rng.c | 20 ++------------------
 1 file changed, 2 insertions(+), 18 deletions(-)

diff --git a/drivers/char/hw_random/meson-rng.c b/drivers/char/hw_random/meson-rng.c
index 8bb30282ca46..06db5a93e257 100644
--- a/drivers/char/hw_random/meson-rng.c
+++ b/drivers/char/hw_random/meson-rng.c
@@ -33,16 +33,10 @@ static int meson_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 	return sizeof(u32);
 }
 
-static void meson_rng_clk_disable(void *data)
-{
-	clk_disable_unprepare(data);
-}
-
 static int meson_rng_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct meson_rng_data *data;
-	int ret;
 
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
@@ -54,20 +48,10 @@ static int meson_rng_probe(struct platform_device *pdev)
 	if (IS_ERR(data->base))
 		return PTR_ERR(data->base);
 
-	data->core_clk = devm_clk_get_optional(dev, "core");
+	data->core_clk = devm_clk_get_optional_enabled(dev, "core");
 	if (IS_ERR(data->core_clk))
 		return dev_err_probe(dev, PTR_ERR(data->core_clk),
-				     "Failed to get core clock\n");
-
-	if (data->core_clk) {
-		ret = clk_prepare_enable(data->core_clk);
-		if (ret)
-			return ret;
-		ret = devm_add_action_or_reset(dev, meson_rng_clk_disable,
-					       data->core_clk);
-		if (ret)
-			return ret;
-	}
+				     "Failed to get enabled core clock\n");
 
 	data->rng.name = pdev->name;
 	data->rng.read = meson_rng_read;
-- 
2.35.1