[PATCH v8 05/16] hwrng: meson - Don't open-code devm_clk_get_optional_enabled()

Uwe Kleine-König
2022-03-14T14:17:17Z

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