[PATCH 4/13] i2c: sirf: use clk_prepare_enable and clk_disable_unprepare

[PATCH 4/13] i2c: sirf: use clk_prepare_enable and clk_disable_unprepare

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@lip6.fr>

Clk_prepare_enable and clk_disable_unprepare combine clk_prepare and
clk_enable, and clk_disable and clk_unprepare.  They make the code more
concise, and ensure that clk_unprepare is called when clk_enable fails.

A simplified version of the semantic patch that introduces calls to these
functions is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@

- clk_prepare(e);
- clk_enable(e);
+ clk_prepare_enable(e);

@@
expression e;
@@

- clk_disable(e);
- clk_unprepare(e);
+ clk_disable_unprepare(e);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/i2c/busses/i2c-sirf.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sirf.c b/drivers/i2c/busses/i2c-sirf.c
index 5574a47..110660a 100644
--- a/drivers/i2c/busses/i2c-sirf.c
+++ b/drivers/i2c/busses/i2c-sirf.c
@@ -278,18 +278,12 @@ static int __devinit i2c_sirfsoc_probe(struct platform_device *pdev)
 		goto err_get_clk;
 	}
 
-	err = clk_prepare(clk);
+	err = clk_prepare_enable(clk);
 	if (err) {
-		dev_err(&pdev->dev, "Clock prepare failed\n");
+		dev_err(&pdev->dev, "Clock prepare or enable failed\n");
 		goto err_clk_prep;
 	}
 
-	err = clk_enable(clk);
-	if (err) {
-		dev_err(&pdev->dev, "Clock enable failed\n");
-		goto err_clk_en;
-	}
-
 	ctrl_speed = clk_get_rate(clk);
 
 	siic = devm_kzalloc(&pdev->dev, sizeof(*siic), GFP_KERNEL);
@@ -376,9 +370,7 @@ static int __devinit i2c_sirfsoc_probe(struct platform_device *pdev)
 	return 0;
 
 out:
-	clk_disable(clk);
-err_clk_en:
-	clk_unprepare(clk);
+	clk_disable_unprepare(clk);
 err_clk_prep:
 	clk_put(clk);
 err_get_clk:

[PATCH 8/13] i2c: mv64xxx: use clk_prepare_enable and clk_disable_unprepare

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@lip6.fr>

Clk_prepare_enable and clk_disable_unprepare combine clk_prepare and
clk_enable, and clk_disable and clk_unprepare.  They make the code more
concise, and ensure that clk_unprepare is called when clk_enable fails.

A simplified version of the semantic patch that introduces calls to these
functions is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@

- clk_prepare(e);
- clk_enable(e);
+ clk_prepare_enable(e);

@@
expression e;
@@

- clk_disable(e);
- clk_unprepare(e);
+ clk_disable_unprepare(e);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/i2c/busses/i2c-mv64xxx.c |   18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 2e9d567..046c4b5 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -633,10 +633,8 @@ mv64xxx_i2c_probe(struct platform_device *pd)
 #if defined(CONFIG_HAVE_CLK)
 	/* Not all platforms have a clk */
 	drv_data->clk = clk_get(&pd->dev, NULL);
-	if (!IS_ERR(drv_data->clk)) {
-		clk_prepare(drv_data->clk);
-		clk_enable(drv_data->clk);
-	}
+	if (!IS_ERR(drv_data->clk))
+		clk_prepare_enable(drv_data->clk);
 #endif
 	if (pdata) {
 		drv_data->freq_m = pdata->freq_m;
@@ -686,10 +684,8 @@ mv64xxx_i2c_probe(struct platform_device *pd)
 	exit_unmap_regs:
 #if defined(CONFIG_HAVE_CLK)
 	/* Not all platforms have a clk */
-	if (!IS_ERR(drv_data->clk)) {
-		clk_disable(drv_data->clk);
-		clk_unprepare(drv_data->clk);
-	}
+	if (!IS_ERR(drv_data->clk))
+		clk_disable_unprepare(drv_data->clk);
 #endif
 		mv64xxx_i2c_unmap_regs(drv_data);
 	exit_kfree:
@@ -708,10 +704,8 @@ mv64xxx_i2c_remove(struct platform_device *dev)
 	mv64xxx_i2c_unmap_regs(drv_data);
 #if defined(CONFIG_HAVE_CLK)
 	/* Not all platforms have a clk */
-	if (!IS_ERR(drv_data->clk)) {
-		clk_disable(drv_data->clk);
-		clk_unprepare(drv_data->clk);
-	}
+	if (!IS_ERR(drv_data->clk))
+		clk_disable_unprepare(drv_data->clk);
 #endif
 	kfree(drv_data);
 

Re: [PATCH 4/13] i2c: sirf: use clk_prepare_enable and clk_disable_unprepare

[Barry Song]

2012/8/27 Julia Lawall <Julia.Lawall-L2FTfq7BK8M@public.gmane.org>:
> From: Julia Lawall <Julia.Lawall-L2FTfq7BK8M@public.gmane.org>
>
> Clk_prepare_enable and clk_disable_unprepare combine clk_prepare and
> clk_enable, and clk_disable and clk_unprepare.  They make the code more
> concise, and ensure that clk_unprepare is called when clk_enable fails.
>
> A simplified version of the semantic patch that introduces calls to these
> functions is as follows: (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression e;
> @@
>
> - clk_prepare(e);
> - clk_enable(e);
> + clk_prepare_enable(e);
>
> @@
> expression e;
> @@
>
> - clk_disable(e);
> - clk_unprepare(e);
> + clk_disable_unprepare(e);
> // </smpl>
>
> Signed-off-by: Julia Lawall <Julia.Lawall-L2FTfq7BK8M@public.gmane.org>

Acked-by: Barry Song <21cnbao-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>