This patchset cleans up the probe function of i2c-s3c2410 driver.
These have been tested on Exynos4210 based Origen board.
Changes since V1:
* devm_request_mem_region and devm_ioremap calls were replaced by
devm_request_and_ioremap() call.
* All devm_* related modifications (earlier patches 2-5) were merged
to a single patch.
Tushar Behera (4):
i2c: s3c2410: Remove unnecessary label err_noclk
i2c: s3c2410: Convert to use devm_* APIs
i2c: s3c2410: Move location of clk_prepare_enable() call in probe
function
i2c: s3c2410: Remove err_cpufreq label
drivers/i2c/busses/i2c-s3c2410.c | 83 ++++++++++---------------------------
1 files changed, 23 insertions(+), 60 deletions(-)
--
1.7.4.1
err_noclk label redirects to a simple return statement. Move the
return statement to the caller location and remove the label.
Signed-off-by: Tushar Behera <[email protected]>
---
drivers/i2c/busses/i2c-s3c2410.c | 9 +++------
1 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 3e0335f..7522f40 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -945,8 +945,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
i2c->pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!i2c->pdata) {
- ret = -ENOMEM;
- goto err_noclk;
+ dev_err(&pdev->dev, "no memory for platform data\n");
+ return -ENOMEM;
}
i2c->quirks = s3c24xx_get_device_quirks(pdev);
@@ -971,8 +971,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
i2c->clk = clk_get(&pdev->dev, "i2c");
if (IS_ERR(i2c->clk)) {
dev_err(&pdev->dev, "cannot get clock\n");
- ret = -ENOENT;
- goto err_noclk;
+ return -ENOENT;
}
dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk);
@@ -1084,8 +1083,6 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
err_clk:
clk_disable_unprepare(i2c->clk);
clk_put(i2c->clk);
-
- err_noclk:
return ret;
}
--
1.7.4.1
i2c-s3c2410 driver is modified to use devm_clk_get(),
devm_request_and_ioremap() (combining request_mem_region() and
ioremap()) and devm_request_irq(). This also simplifies the
return path in driver's probe.
Signed-off-by: Tushar Behera <[email protected]>
---
Changes since V1:
* devm_request_mem_region and devm_ioremap calls were replaced by
devm_request_and_ioremap() call.
* All devm_* related modifications (earlier patches 2-5) were merged
to a single patch.
drivers/i2c/busses/i2c-s3c2410.c | 51 +++++++++-----------------------------
1 files changed, 12 insertions(+), 39 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 7522f40..a203917 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -78,7 +78,6 @@ struct s3c24xx_i2c {
void __iomem *regs;
struct clk *clk;
struct device *dev;
- struct resource *ioarea;
struct i2c_adapter adap;
struct s3c2410_platform_i2c *pdata;
@@ -968,7 +967,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
/* find the clock and enable it */
i2c->dev = &pdev->dev;
- i2c->clk = clk_get(&pdev->dev, "i2c");
+ i2c->clk = devm_clk_get(&pdev->dev, "i2c");
if (IS_ERR(i2c->clk)) {
dev_err(&pdev->dev, "cannot get clock\n");
return -ENOENT;
@@ -987,25 +986,16 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
goto err_clk;
}
- i2c->ioarea = request_mem_region(res->start, resource_size(res),
- pdev->name);
-
- if (i2c->ioarea == NULL) {
- dev_err(&pdev->dev, "cannot request IO\n");
- ret = -ENXIO;
- goto err_clk;
- }
-
- i2c->regs = ioremap(res->start, resource_size(res));
+ i2c->regs = devm_request_and_ioremap(&pdev->dev, res);
if (i2c->regs == NULL) {
- dev_err(&pdev->dev, "cannot map IO\n");
+ dev_err(&pdev->dev, "cannot request and map IO\n");
ret = -ENXIO;
- goto err_ioarea;
+ goto err_clk;
}
- dev_dbg(&pdev->dev, "registers %p (%p, %p)\n",
- i2c->regs, i2c->ioarea, res);
+ dev_dbg(&pdev->dev, "registers %p (%p)\n",
+ i2c->regs, res);
/* setup info block for the i2c core */
@@ -1016,7 +1006,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
ret = s3c24xx_i2c_init(i2c);
if (ret != 0)
- goto err_iomap;
+ goto err_clk;
/* find the IRQ for this unit (note, this relies on the init call to
* ensure no current IRQs pending
@@ -1025,21 +1015,21 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
i2c->irq = ret = platform_get_irq(pdev, 0);
if (ret <= 0) {
dev_err(&pdev->dev, "cannot find IRQ\n");
- goto err_iomap;
+ goto err_clk;
}
- ret = request_irq(i2c->irq, s3c24xx_i2c_irq, 0,
- dev_name(&pdev->dev), i2c);
+ ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, 0,
+ dev_name(&pdev->dev), i2c);
if (ret != 0) {
dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
- goto err_iomap;
+ goto err_clk;
}
ret = s3c24xx_i2c_register_cpufreq(i2c);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
- goto err_irq;
+ goto err_clk;
}
/* Note, previous versions of the driver used i2c_add_adapter()
@@ -1070,19 +1060,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
err_cpufreq:
s3c24xx_i2c_deregister_cpufreq(i2c);
- err_irq:
- free_irq(i2c->irq, i2c);
-
- err_iomap:
- iounmap(i2c->regs);
-
- err_ioarea:
- release_resource(i2c->ioarea);
- kfree(i2c->ioarea);
-
err_clk:
clk_disable_unprepare(i2c->clk);
- clk_put(i2c->clk);
return ret;
}
@@ -1101,16 +1080,10 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
s3c24xx_i2c_deregister_cpufreq(i2c);
i2c_del_adapter(&i2c->adap);
- free_irq(i2c->irq, i2c);
clk_disable_unprepare(i2c->clk);
- clk_put(i2c->clk);
-
- iounmap(i2c->regs);
- release_resource(i2c->ioarea);
s3c24xx_i2c_dt_gpio_free(i2c);
- kfree(i2c->ioarea);
return 0;
}
--
1.7.4.1
In i2c-s3c2410 driver probe, only s3c24xx_i2c_init() needs the I2C clock
to be enabled. Moving clk_prepare_enable() and clk_disable_unprepare()
calls to around this function simplifies the return path of probe call.
Signed-off-by: Tushar Behera <[email protected]>
---
Changes since V1:
* Rebased as per the V2 patch series.
drivers/i2c/busses/i2c-s3c2410.c | 26 +++++++++++---------------
1 files changed, 11 insertions(+), 15 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index a203917..3f2d632 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -975,23 +975,20 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "clock source %p\n", i2c->clk);
- clk_prepare_enable(i2c->clk);
/* map the registers */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "cannot find IO resource\n");
- ret = -ENOENT;
- goto err_clk;
+ return -ENOENT;
}
i2c->regs = devm_request_and_ioremap(&pdev->dev, res);
if (i2c->regs == NULL) {
dev_err(&pdev->dev, "cannot request and map IO\n");
- ret = -ENXIO;
- goto err_clk;
+ return -ENXIO;
}
dev_dbg(&pdev->dev, "registers %p (%p)\n",
@@ -1004,10 +1001,13 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
/* initialise the i2c controller */
+ clk_prepare_enable(i2c->clk);
ret = s3c24xx_i2c_init(i2c);
- if (ret != 0)
- goto err_clk;
-
+ clk_disable_unprepare(i2c->clk);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "I2C controller init failed\n");
+ return ret;
+ }
/* find the IRQ for this unit (note, this relies on the init call to
* ensure no current IRQs pending
*/
@@ -1015,7 +1015,7 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
i2c->irq = ret = platform_get_irq(pdev, 0);
if (ret <= 0) {
dev_err(&pdev->dev, "cannot find IRQ\n");
- goto err_clk;
+ return ret;
}
ret = devm_request_irq(&pdev->dev, i2c->irq, s3c24xx_i2c_irq, 0,
@@ -1023,13 +1023,13 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
if (ret != 0) {
dev_err(&pdev->dev, "cannot claim IRQ %d\n", i2c->irq);
- goto err_clk;
+ return ret;
}
ret = s3c24xx_i2c_register_cpufreq(i2c);
if (ret < 0) {
dev_err(&pdev->dev, "failed to register cpufreq notifier\n");
- goto err_clk;
+ return ret;
}
/* Note, previous versions of the driver used i2c_add_adapter()
@@ -1054,14 +1054,10 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
pm_runtime_enable(&i2c->adap.dev);
dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
- clk_disable_unprepare(i2c->clk);
return 0;
err_cpufreq:
s3c24xx_i2c_deregister_cpufreq(i2c);
-
- err_clk:
- clk_disable_unprepare(i2c->clk);
return ret;
}
--
1.7.4.1
err_cpufreq label is now used only once. It can be removed and related
code can be moved to the caller location.
Signed-off-by: Tushar Behera <[email protected]>
---
Changes since V1:
* Rebased as per the V2 patch series.
drivers/i2c/busses/i2c-s3c2410.c | 7 ++-----
1 files changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 3f2d632..ff4408d 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1044,7 +1044,8 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
ret = i2c_add_numbered_adapter(&i2c->adap);
if (ret < 0) {
dev_err(&pdev->dev, "failed to add bus to i2c core\n");
- goto err_cpufreq;
+ s3c24xx_i2c_deregister_cpufreq(i2c);
+ return ret;
}
of_i2c_register_devices(&i2c->adap);
@@ -1055,10 +1056,6 @@ static int s3c24xx_i2c_probe(struct platform_device *pdev)
dev_info(&pdev->dev, "%s: S3C I2C adapter\n", dev_name(&i2c->adap.dev));
return 0;
-
- err_cpufreq:
- s3c24xx_i2c_deregister_cpufreq(i2c);
- return ret;
}
/* s3c24xx_i2c_remove
--
1.7.4.1