[PATCH v6 RESEND 0/6] clk: provide new devm helpers for prepared and enabled clocks

[PATCH v6 RESEND 0/6] clk: provide new devm helpers for prepared and enabled clocks

[Uwe Kleine-König]

Hello,

this is just a resend as I didn't get any feedback in the two weeks
since the original v6 submission. Would be nice to hear something back,
I'm trying for more than half a year now to get feedback. :-\

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

[PATCH v6 RESEND 0/6] clk: provide new devm helpers for prepared and enabled clocks

[Uwe Kleine-König]

Hello,

this is just a resend as I didn't get any feedback in the two weeks
since the original v6 submission. Would be nice to hear something back,
I'm trying for more than half a year now to get feedback. :-\

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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[PATCH v6 RESEND 1/6] clk: generalize devm_clk_get() a bit

[Uwe Kleine-König]

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

[PATCH v6 RESEND 1/6] clk: generalize devm_clk_get() a bit

[Uwe Kleine-König]

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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Re: [PATCH v6 RESEND 1/6] clk: generalize devm_clk_get() a bit

[Jonathan Cameron]

On Mon, 10 May 2021 08:17:19 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> 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>

If feels marginally odd to register cleanup that we know won't do anything
for the optional case, but it works as far as I can tell and it would be
a little fiddly to special case it.

FWIW

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  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);
>  

Re: [PATCH v6 RESEND 1/6] clk: generalize devm_clk_get() a bit

[Jonathan Cameron]

On Mon, 10 May 2021 08:17:19 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> 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>

If feels marginally odd to register cleanup that we know won't do anything
for the optional case, but it works as far as I can tell and it would be
a little fiddly to special case it.

FWIW

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  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);
>  


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Re: [PATCH v6 RESEND 1/6] clk: generalize devm_clk_get() a bit

[Uwe Kleine-König]

[-- Attachment #1: Type: text/plain, Size: 1755 bytes --]

On Mon, May 10, 2021 at 06:02:05PM +0100, Jonathan Cameron wrote:
> On Mon, 10 May 2021 08:17:19 +0200
> Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:
> 
> > 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>
> 
> If feels marginally odd to register cleanup that we know won't do anything
> for the optional case, but it works as far as I can tell and it would be
> a little fiddly to special case it.

It took a moment for me to understand your concern. Yes, I register a
cleanup even if (*init) happens to be clk_get_optional() and it returned
NULL. It's not hard to optimize that:

diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index b54f7f0f2a35..2420d6ae7b33 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -38,14 +38,17 @@ static struct clk *__devm_clk_get(struct device *dev, const char *id,
 		goto err_clk_get;
 	}
 
-	if (init) {
-		ret = init(clk);
-		if (ret)
-			goto err_clk_init;
+	/* short-cut the case where clk_get_optional returned NULL */
+	if (clk) {
+		if (init) {
+			ret = init(clk);
+			if (ret)
+				goto err_clk_init;
+		}
+		state->exit = exit;
 	}
 
 	state->clk = clk;
-	state->exit = exit;
 
 	devres_add(dev, state);

But I'd value simplicity over micro-optimizing and keep the code as is.
 
Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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Re: [PATCH v6 RESEND 1/6] clk: generalize devm_clk_get() a bit

[Uwe Kleine-König]

[-- Attachment #1.1: Type: text/plain, Size: 1755 bytes --]

On Mon, May 10, 2021 at 06:02:05PM +0100, Jonathan Cameron wrote:
> On Mon, 10 May 2021 08:17:19 +0200
> Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:
> 
> > 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>
> 
> If feels marginally odd to register cleanup that we know won't do anything
> for the optional case, but it works as far as I can tell and it would be
> a little fiddly to special case it.

It took a moment for me to understand your concern. Yes, I register a
cleanup even if (*init) happens to be clk_get_optional() and it returned
NULL. It's not hard to optimize that:

diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c
index b54f7f0f2a35..2420d6ae7b33 100644
--- a/drivers/clk/clk-devres.c
+++ b/drivers/clk/clk-devres.c
@@ -38,14 +38,17 @@ static struct clk *__devm_clk_get(struct device *dev, const char *id,
 		goto err_clk_get;
 	}
 
-	if (init) {
-		ret = init(clk);
-		if (ret)
-			goto err_clk_init;
+	/* short-cut the case where clk_get_optional returned NULL */
+	if (clk) {
+		if (init) {
+			ret = init(clk);
+			if (ret)
+				goto err_clk_init;
+		}
+		state->exit = exit;
 	}
 
 	state->clk = clk;
-	state->exit = exit;
 
 	devres_add(dev, state);

But I'd value simplicity over micro-optimizing and keep the code as is.
 
Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

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[PATCH v6 RESEND 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks

[Uwe Kleine-König]

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

[PATCH v6 RESEND 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks

[Uwe Kleine-König]

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


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v6 RESEND 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks

[Jonathan Cameron]

On Mon, 10 May 2021 08:17:20 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> 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>

Given it's not hard to do, might be nice to keep the docs lines under 80 chars.
Other than that... Does what it says on the tin.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>


> ---
>  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)
>  {

Re: [PATCH v6 RESEND 2/6] clk: Provide new devm_clk_helpers for prepared and enabled clocks

[Jonathan Cameron]

On Mon, 10 May 2021 08:17:20 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> 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>

Given it's not hard to do, might be nice to keep the docs lines under 80 chars.
Other than that... Does what it says on the tin.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>


> ---
>  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)
>  {


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[PATCH v6 RESEND 3/6] pwm: atmel: Simplify using devm_clk_get_prepared()

[Uwe Kleine-König]

With devm_clk_get_prepared() caring to unprepare the clock the error
path and remove callback can be simplified accordingly.

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/pwm/pwm-atmel.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
index 5813339b597b..d65e23da2582 100644
--- a/drivers/pwm/pwm-atmel.c
+++ b/drivers/pwm/pwm-atmel.c
@@ -415,16 +415,10 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(atmel_pwm->base))
 		return PTR_ERR(atmel_pwm->base);
 
-	atmel_pwm->clk = devm_clk_get(&pdev->dev, NULL);
+	atmel_pwm->clk = devm_clk_get_prepared(&pdev->dev, NULL);
 	if (IS_ERR(atmel_pwm->clk))
 		return PTR_ERR(atmel_pwm->clk);
 
-	ret = clk_prepare(atmel_pwm->clk);
-	if (ret) {
-		dev_err(&pdev->dev, "failed to prepare PWM clock\n");
-		return ret;
-	}
-
 	atmel_pwm->chip.dev = &pdev->dev;
 	atmel_pwm->chip.ops = &atmel_pwm_ops;
 	atmel_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
@@ -435,23 +429,18 @@ static int atmel_pwm_probe(struct platform_device *pdev)
 	ret = pwmchip_add(&atmel_pwm->chip);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "failed to add PWM chip %d\n", ret);
-		goto unprepare_clk;
+		return ret;
 	}
 
 	platform_set_drvdata(pdev, atmel_pwm);
 
 	return ret;
-
-unprepare_clk:
-	clk_unprepare(atmel_pwm->clk);
-	return ret;
 }
 
 static int atmel_pwm_remove(struct platform_device *pdev)
 {
 	struct atmel_pwm_chip *atmel_pwm = platform_get_drvdata(pdev);
 
-	clk_unprepare(atmel_pwm->clk);
 	mutex_destroy(&atmel_pwm->isr_lock);
 
 	return pwmchip_remove(&atmel_pwm->chip);
-- 
2.30.2

[PATCH v6 RESEND 4/6] rtc: at91sam9: Simplify using devm_clk_get_enabled()

[Uwe Kleine-König]

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

[PATCH v6 RESEND 4/6] rtc: at91sam9: Simplify using devm_clk_get_enabled()

[Uwe Kleine-König]

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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[PATCH v6 RESEND 5/6] i2c: imx: Simplify using devm_clk_get_enabled()

[Uwe Kleine-König]

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

[PATCH v6 RESEND 5/6] i2c: imx: Simplify using devm_clk_get_enabled()

[Uwe Kleine-König]

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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[PATCH v6 RESEND 6/6] spi: davinci: Simplify using devm_clk_get_enabled()

[Uwe Kleine-König]

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: Mark Brown <broonie@kernel.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/spi/spi-davinci.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
index 7453a1dbbc06..63ee918ecdb0 100644
--- a/drivers/spi/spi-davinci.c
+++ b/drivers/spi/spi-davinci.c
@@ -936,14 +936,11 @@ static int davinci_spi_probe(struct platform_device *pdev)
 
 	dspi->bitbang.master = master;
 
-	dspi->clk = devm_clk_get(&pdev->dev, NULL);
+	dspi->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(dspi->clk)) {
 		ret = -ENODEV;
 		goto free_master;
 	}
-	ret = clk_prepare_enable(dspi->clk);
-	if (ret)
-		goto free_master;
 
 	master->use_gpio_descriptors = true;
 	master->dev.of_node = pdev->dev.of_node;
@@ -968,7 +965,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
 
 	ret = davinci_spi_request_dma(dspi);
 	if (ret == -EPROBE_DEFER) {
-		goto free_clk;
+		goto free_master;
 	} else if (ret) {
 		dev_info(&pdev->dev, "DMA is not supported (%d)\n", ret);
 		dspi->dma_rx = NULL;
@@ -1012,8 +1009,6 @@ static int davinci_spi_probe(struct platform_device *pdev)
 		dma_release_channel(dspi->dma_rx);
 		dma_release_channel(dspi->dma_tx);
 	}
-free_clk:
-	clk_disable_unprepare(dspi->clk);
 free_master:
 	spi_master_put(master);
 err:
@@ -1039,8 +1034,6 @@ static int davinci_spi_remove(struct platform_device *pdev)
 
 	spi_bitbang_stop(&dspi->bitbang);
 
-	clk_disable_unprepare(dspi->clk);
-
 	if (dspi->dma_rx) {
 		dma_release_channel(dspi->dma_rx);
 		dma_release_channel(dspi->dma_tx);
-- 
2.30.2

Re: [PATCH v6 RESEND 0/6] clk: provide new devm helpers for prepared and enabled clocks

[Jonathan Cameron]

On Mon, 10 May 2021 08:17:18 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> Hello,
> 
> this is just a resend as I didn't get any feedback in the two weeks
> since the original v6 submission. Would be nice to hear something back,
> I'm trying for more than half a year now to get feedback. :-\

I have a bunch of usecases in IIO, (many with local devm_add_action_or_reset()
doing the same thing.)

+CC Alex who sent out a series add more local handling of this case
today.

Code seems correct and clean to me, but whether the clk maintainers
want to encourage this pattern is down to them (I've had similar discussions
about regulators in the past where we've agreed to disagree on this topic).

Jonathan

> 
> 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

Re: [PATCH v6 RESEND 0/6] clk: provide new devm helpers for prepared and enabled clocks

[Jonathan Cameron]

On Mon, 10 May 2021 08:17:18 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> Hello,
> 
> this is just a resend as I didn't get any feedback in the two weeks
> since the original v6 submission. Would be nice to hear something back,
> I'm trying for more than half a year now to get feedback. :-\

I have a bunch of usecases in IIO, (many with local devm_add_action_or_reset()
doing the same thing.)

+CC Alex who sent out a series add more local handling of this case
today.

Code seems correct and clean to me, but whether the clk maintainers
want to encourage this pattern is down to them (I've had similar discussions
about regulators in the past where we've agreed to disagree on this topic).

Jonathan

> 
> 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


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