* [PATCH v6 0/6] clk: provide new devm helpers for prepared and enabled clocks
@ 2021-04-26 14:17 Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 1/6] clk: generalize devm_clk_get() a bit Uwe Kleine-König
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2021-04-26 14:17 UTC (permalink / raw)
To: Michael Turquette, Stephen Boyd
Cc: linux-rtc, linux-pwm, Alexandre Belloni, Alessandro Zummo,
Mark Brown, Claudiu Beznea, Wolfram Sang, Oleksij Rempel,
Ludovic Desroches, Thierry Reding, kernel, linux-spi, Lee Jones,
linux-clk, linux-arm-kernel
Hello,
compared to v5 sent last week this series only fixes two typos in the
commit logs.
The range-diff is
1: 0f2fe65a9c9c ! 1: 38f213c5eeff rtc: at91sma9: Simplify using devm_clk_get_enabled()
@@ Metadata
Author: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
## Commit message ##
- rtc: at91sma9: Simplify using devm_clk_get_enabled()
+ rtc: at91sam9: Simplify using devm_clk_get_enabled()
devm_clk_get_enabled() returns the clk already (prepared and) enabled
and the automatically called cleanup cares for disabling (and
2: 3f11b70e7427 ! 2: b9cebea08a73 i2c: imx: Simplify using devm_clk_get_enableded()
@@ Metadata
Author: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
## Commit message ##
- i2c: imx: Simplify using devm_clk_get_enableded()
+ i2c: imx: Simplify using devm_clk_get_enabled()
devm_clk_get_enabled() returns the clk already (prepared and) enabled
and the automatically called cleanup cares for disabling (and
3: 6c357913e391 = 3: 8167605ad349 spi: davinci: Simplify using devm_clk_get_enabled()
4: 71b3db526357 < -: ------------ pwm: Clarify documentation about pwm_get_state()
Other than that the state is still unchanged: This is a series which
allows several cleanups (as can be seen from patches 2 to 6) and I
didn't get any feedback from the clock maintainers since v1 that I sent
in October.
Best regards
Uwe
Uwe Kleine-König (6):
clk: generalize devm_clk_get() a bit
clk: Provide new devm_clk_helpers for prepared and enabled clocks
pwm: atmel: Simplify using devm_clk_get_prepared()
rtc: at91sam9: Simplify using devm_clk_get_enabled()
i2c: imx: Simplify using devm_clk_get_enabled()
spi: davinci: Simplify using devm_clk_get_enabled()
drivers/clk/clk-devres.c | 96 ++++++++++++++++++++++++++++++------
drivers/i2c/busses/i2c-imx.c | 12 +----
drivers/pwm/pwm-atmel.c | 15 +-----
drivers/rtc/rtc-at91sam9.c | 22 ++-------
drivers/spi/spi-davinci.c | 11 +----
include/linux/clk.h | 87 +++++++++++++++++++++++++++++++-
6 files changed, 176 insertions(+), 67 deletions(-)
base-commit: a38fd8748464831584a19438cbb3082b5a2dab15
--
2.30.2
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v6 1/6] clk: generalize devm_clk_get() a bit
2021-04-26 14:17 [PATCH v6 0/6] clk: provide new devm helpers for prepared and enabled clocks Uwe Kleine-König
@ 2021-04-26 14:17 ` Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks Uwe Kleine-König
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2021-04-26 14:17 UTC (permalink / raw)
To: Michael Turquette, Stephen Boyd
Cc: linux-rtc, linux-pwm, Alexandre Belloni, Alessandro Zummo,
Mark Brown, Claudiu Beznea, Wolfram Sang, Oleksij Rempel,
Ludovic Desroches, Thierry Reding, kernel, linux-spi, Lee Jones,
linux-clk, linux-arm-kernel
Allow to add an exit hook to devm managed clocks. Also use
clk_get_optional() in devm_clk_get_optional instead of open coding it.
The generalisation will be used in the next commit to add some more
devm_clk helpers.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/clk/clk-devres.c | 67 ++++++++++++++++++++++++++++++----------
1 file changed, 50 insertions(+), 17 deletions(-)
diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index be160764911b..91c995815b57 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -4,39 +4,72 @@
#include <linux/export.h>
#include <linux/gfp.h>
+struct devm_clk_state {
+ struct clk *clk;
+ void (*exit)(struct clk *clk);
+};
+
static void devm_clk_release(struct device *dev, void *res)
{
- clk_put(*(struct clk **)res);
+ struct devm_clk_state *state = *(struct devm_clk_state **)res;
+
+ if (state->exit)
+ state->exit(state->clk);
+
+ clk_put(state->clk);
}
-struct clk *devm_clk_get(struct device *dev, const char *id)
+static struct clk *__devm_clk_get(struct device *dev, const char *id,
+ struct clk *(*get)(struct device *dev, const char *id),
+ int (*init)(struct clk *clk),
+ void (*exit)(struct clk *clk))
{
- struct clk **ptr, *clk;
+ struct devm_clk_state *state;
+ struct clk *clk;
+ int ret;
- ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
+ state = devres_alloc(devm_clk_release, sizeof(*state), GFP_KERNEL);
+ if (!state)
return ERR_PTR(-ENOMEM);
- clk = clk_get(dev, id);
- if (!IS_ERR(clk)) {
- *ptr = clk;
- devres_add(dev, ptr);
- } else {
- devres_free(ptr);
+ clk = get(dev, id);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err_clk_get;
}
+ if (init) {
+ ret = init(clk);
+ if (ret)
+ goto err_clk_init;
+ }
+
+ state->clk = clk;
+ state->exit = exit;
+
+ devres_add(dev, state);
+
return clk;
+
+err_clk_init:
+
+ clk_put(clk);
+err_clk_get:
+
+ devres_free(state);
+ return ERR_PTR(ret);
}
-EXPORT_SYMBOL(devm_clk_get);
-struct clk *devm_clk_get_optional(struct device *dev, const char *id)
+struct clk *devm_clk_get(struct device *dev, const char *id)
{
- struct clk *clk = devm_clk_get(dev, id);
+ return __devm_clk_get(dev, id, clk_get, NULL, NULL);
- if (clk == ERR_PTR(-ENOENT))
- return NULL;
+}
+EXPORT_SYMBOL(devm_clk_get);
- return clk;
+struct clk *devm_clk_get_optional(struct device *dev, const char *id)
+{
+ return __devm_clk_get(dev, id, clk_get_optional, NULL, NULL);
}
EXPORT_SYMBOL(devm_clk_get_optional);
--
2.30.2
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v6 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks
2021-04-26 14:17 [PATCH v6 0/6] clk: provide new devm helpers for prepared and enabled clocks Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 1/6] clk: generalize devm_clk_get() a bit Uwe Kleine-König
@ 2021-04-26 14:17 ` Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 4/6] rtc: at91sam9: Simplify using devm_clk_get_enabled() Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 5/6] i2c: imx: " Uwe Kleine-König
3 siblings, 0 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2021-04-26 14:17 UTC (permalink / raw)
To: Michael Turquette, Stephen Boyd
Cc: linux-rtc, linux-pwm, Alexandre Belloni, Alessandro Zummo,
Mark Brown, Claudiu Beznea, Wolfram Sang, Oleksij Rempel,
Ludovic Desroches, Thierry Reding, kernel, linux-spi, Lee Jones,
linux-clk, linux-arm-kernel
When a driver keeps a clock prepared (or enabled) during the whole
lifetime of the driver, these helpers allow to simplify the drivers.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/clk/clk-devres.c | 31 ++++++++++++++
include/linux/clk.h | 87 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 117 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index 91c995815b57..b54f7f0f2a35 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -67,12 +67,43 @@ struct clk *devm_clk_get(struct device *dev, const char *id)
}
EXPORT_SYMBOL(devm_clk_get);
+struct clk *devm_clk_get_prepared(struct device *dev, const char *id)
+{
+ return __devm_clk_get(dev, id, clk_get, clk_prepare, clk_unprepare);
+
+}
+EXPORT_SYMBOL(devm_clk_get_prepared);
+
+struct clk *devm_clk_get_enabled(struct device *dev, const char *id)
+{
+ return __devm_clk_get(dev, id, clk_get,
+ clk_prepare_enable, clk_disable_unprepare);
+
+}
+EXPORT_SYMBOL(devm_clk_get_enabled);
+
struct clk *devm_clk_get_optional(struct device *dev, const char *id)
{
return __devm_clk_get(dev, id, clk_get_optional, NULL, NULL);
}
EXPORT_SYMBOL(devm_clk_get_optional);
+struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id)
+{
+ return __devm_clk_get(dev, id, clk_get_optional,
+ clk_prepare, clk_unprepare);
+
+}
+EXPORT_SYMBOL(devm_clk_get_optional_prepared);
+
+struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id)
+{
+ return __devm_clk_get(dev, id, clk_get_optional,
+ clk_prepare_enable, clk_disable_unprepare);
+
+}
+EXPORT_SYMBOL(devm_clk_get_optional_enabled);
+
struct clk_bulk_devres {
struct clk_bulk_data *clks;
int num_clks;
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 266e8de3cb51..b3c5da388b08 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -449,7 +449,7 @@ int __must_check devm_clk_bulk_get_all(struct device *dev,
* the clock producer. (IOW, @id may be identical strings, but
* clk_get may return different clock producers depending on @dev.)
*
- * Drivers must assume that the clock source is not enabled.
+ * Drivers must assume that the clock source is neither prepared nor enabled.
*
* devm_clk_get should not be called from within interrupt context.
*
@@ -458,6 +458,47 @@ int __must_check devm_clk_bulk_get_all(struct device *dev,
*/
struct clk *devm_clk_get(struct device *dev, const char *id);
+/**
+ * devm_clk_get_prepared - devm_clk_get() + clk_prepare()
+ * @dev: device for clock "consumer"
+ * @id: clock consumer ID
+ *
+ * Returns a struct clk corresponding to the clock producer, or
+ * valid IS_ERR() condition containing errno. The implementation
+ * uses @dev and @id to determine the clock consumer, and thereby
+ * the clock producer. (IOW, @id may be identical strings, but
+ * clk_get may return different clock producers depending on @dev.)
+ *
+ * The returned clk (if valid) is prepared. Drivers must however assume that the
+ * clock is not enabled.
+ *
+ * devm_clk_get_prepared should not be called from within interrupt context.
+ *
+ * The clock will automatically be unprepared and freed when the
+ * device is unbound from the bus.
+ */
+struct clk *devm_clk_get_prepared(struct device *dev, const char *id);
+
+/**
+ * devm_clk_get_enabled - devm_clk_get() + clk_prepare_enable()
+ * @dev: device for clock "consumer"
+ * @id: clock consumer ID
+ *
+ * Returns a struct clk corresponding to the clock producer, or
+ * valid IS_ERR() condition containing errno. The implementation
+ * uses @dev and @id to determine the clock consumer, and thereby
+ * the clock producer. (IOW, @id may be identical strings, but
+ * clk_get may return different clock producers depending on @dev.)
+ *
+ * The returned clk (if valid) is prepared and enabled.
+ *
+ * devm_clk_get_prepared should not be called from within interrupt context.
+ *
+ * The clock will automatically be disabled, unprepared and freed when the
+ * device is unbound from the bus.
+ */
+struct clk *devm_clk_get_enabled(struct device *dev, const char *id);
+
/**
* devm_clk_get_optional - lookup and obtain a managed reference to an optional
* clock producer.
@@ -469,6 +510,26 @@ struct clk *devm_clk_get(struct device *dev, const char *id);
*/
struct clk *devm_clk_get_optional(struct device *dev, const char *id);
+/**
+ * devm_clk_get_optional_prepared - devm_clk_get_optional() + clk_prepare()
+ * @dev: device for clock "consumer"
+ * @id: clock consumer ID
+ *
+ * Behaves the same as devm_clk_get_prepared() except where there is no clock producer.
+ * In this case, instead of returning -ENOENT, the function returns NULL.
+ */
+struct clk *devm_clk_get_optional_prepared(struct device *dev, const char *id);
+
+/**
+ * devm_clk_get_optional_enabled - devm_clk_get_optional() + clk_prepare_enable()
+ * @dev: device for clock "consumer"
+ * @id: clock consumer ID
+ *
+ * Behaves the same as devm_clk_get_enabled() except where there is no clock producer.
+ * In this case, instead of returning -ENOENT, the function returns NULL.
+ */
+struct clk *devm_clk_get_optional_enabled(struct device *dev, const char *id);
+
/**
* devm_get_clk_from_child - lookup and obtain a managed reference to a
* clock producer from child node.
@@ -813,12 +874,36 @@ static inline struct clk *devm_clk_get(struct device *dev, const char *id)
return NULL;
}
+static inline struct clk *devm_clk_get_prepared(struct device *dev,
+ const char *id)
+{
+ return NULL;
+}
+
+static inline struct clk *devm_clk_get_enabled(struct device *dev,
+ const char *id)
+{
+ return NULL;
+}
+
static inline struct clk *devm_clk_get_optional(struct device *dev,
const char *id)
{
return NULL;
}
+static inline struct clk *devm_clk_get_optional_prepared(struct device *dev,
+ const char *id)
+{
+ return NULL;
+}
+
+static inline struct clk *devm_clk_get_optional_enabled(struct device *dev,
+ const char *id)
+{
+ return NULL;
+}
+
static inline int __must_check devm_clk_bulk_get(struct device *dev, int num_clks,
struct clk_bulk_data *clks)
{
--
2.30.2
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v6 4/6] rtc: at91sam9: Simplify using devm_clk_get_enabled()
2021-04-26 14:17 [PATCH v6 0/6] clk: provide new devm helpers for prepared and enabled clocks Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 1/6] clk: generalize devm_clk_get() a bit Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks Uwe Kleine-König
@ 2021-04-26 14:17 ` Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 5/6] i2c: imx: " Uwe Kleine-König
3 siblings, 0 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2021-04-26 14:17 UTC (permalink / raw)
To: Michael Turquette, Stephen Boyd, Alessandro Zummo,
Alexandre Belloni, Nicolas Ferre, Ludovic Desroches
Cc: linux-clk, kernel, linux-rtc, linux-arm-kernel
devm_clk_get_enabled() returns the clk already (prepared and) enabled
and the automatically called cleanup cares for disabling (and
unpreparing). So simplify .probe() and .remove() accordingly.
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/rtc/rtc-at91sam9.c | 22 ++++------------------
1 file changed, 4 insertions(+), 18 deletions(-)
diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 2216be429ab7..b52e7bd26303 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -374,21 +374,14 @@ static int at91_rtc_probe(struct platform_device *pdev)
return -ENOMEM;
}
- rtc->sclk = devm_clk_get(&pdev->dev, NULL);
+ rtc->sclk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(rtc->sclk))
return PTR_ERR(rtc->sclk);
- ret = clk_prepare_enable(rtc->sclk);
- if (ret) {
- dev_err(&pdev->dev, "Could not enable slow clock\n");
- return ret;
- }
-
sclk_rate = clk_get_rate(rtc->sclk);
if (!sclk_rate || sclk_rate > AT91_RTT_RTPRES) {
dev_err(&pdev->dev, "Invalid slow clock rate\n");
- ret = -EINVAL;
- goto err_clk;
+ return -EINVAL;
}
mr = rtt_readl(rtc, MR);
@@ -406,7 +399,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtcdev)) {
ret = PTR_ERR(rtc->rtcdev);
- goto err_clk;
+ return ret;
}
rtc->rtcdev->ops = &at91_rtc_ops;
@@ -418,7 +411,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
dev_name(&rtc->rtcdev->dev), rtc);
if (ret) {
dev_dbg(&pdev->dev, "can't share IRQ %d?\n", rtc->irq);
- goto err_clk;
+ return ret;
}
/* NOTE: sam9260 rev A silicon has a ROM bug which resets the
@@ -432,11 +425,6 @@ static int at91_rtc_probe(struct platform_device *pdev)
dev_name(&rtc->rtcdev->dev));
return devm_rtc_register_device(rtc->rtcdev);
-
-err_clk:
- clk_disable_unprepare(rtc->sclk);
-
- return ret;
}
/*
@@ -450,8 +438,6 @@ static int at91_rtc_remove(struct platform_device *pdev)
/* disable all interrupts */
rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
- clk_disable_unprepare(rtc->sclk);
-
return 0;
}
--
2.30.2
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^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v6 5/6] i2c: imx: Simplify using devm_clk_get_enabled()
2021-04-26 14:17 [PATCH v6 0/6] clk: provide new devm helpers for prepared and enabled clocks Uwe Kleine-König
` (2 preceding siblings ...)
2021-04-26 14:17 ` [PATCH v6 4/6] rtc: at91sam9: Simplify using devm_clk_get_enabled() Uwe Kleine-König
@ 2021-04-26 14:17 ` Uwe Kleine-König
3 siblings, 0 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2021-04-26 14:17 UTC (permalink / raw)
To: Michael Turquette, Stephen Boyd, Oleksij Rempel, Shawn Guo, Sascha Hauer
Cc: linux-clk, kernel, Fabio Estevam, NXP Linux Team, linux-i2c,
linux-arm-kernel, Wolfram Sang, Oleksij Rempel
devm_clk_get_enabled() returns the clk already (prepared and) enabled
and the automatically called cleanup cares for disabling (and
unpreparing). So simplify .probe() and .remove() accordingly.
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/i2c/busses/i2c-imx.c | 12 ++----------
1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index b80fdc1f0092..d6594358cf83 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -1405,16 +1405,10 @@ static int i2c_imx_probe(struct platform_device *pdev)
ACPI_COMPANION_SET(&i2c_imx->adapter.dev, ACPI_COMPANION(&pdev->dev));
/* Get I2C clock */
- i2c_imx->clk = devm_clk_get(&pdev->dev, NULL);
+ i2c_imx->clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(i2c_imx->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(i2c_imx->clk),
- "can't get I2C clock\n");
-
- ret = clk_prepare_enable(i2c_imx->clk);
- if (ret) {
- dev_err(&pdev->dev, "can't enable I2C clock, ret=%d\n", ret);
- return ret;
- }
+ "can't get prepared I2C clock\n");
/* Init queue */
init_waitqueue_head(&i2c_imx->queue);
@@ -1487,7 +1481,6 @@ static int i2c_imx_probe(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
- clk_disable_unprepare(i2c_imx->clk);
return ret;
}
@@ -1517,7 +1510,6 @@ static int i2c_imx_remove(struct platform_device *pdev)
irq = platform_get_irq(pdev, 0);
if (irq >= 0)
free_irq(irq, i2c_imx);
- clk_disable_unprepare(i2c_imx->clk);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
--
2.30.2
_______________________________________________
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-04-26 14:19 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2021-04-26 14:17 [PATCH v6 0/6] clk: provide new devm helpers for prepared and enabled clocks Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 1/6] clk: generalize devm_clk_get() a bit Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks Uwe Kleine-König
2021-04-26 14:17 ` [PATCH v6 4/6] rtc: at91sam9: Simplify using devm_clk_get_enabled() Uwe Kleine-König
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