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Subject[PATCH V4] i2c: davinci: update to devm_* API
Date
Update the code to use devm_* API so that driver
core will manage resources.

Signed-off-by: Vishwanathrao Badarkhe, Manish <manishv.b@ti.com>
---
Changes since V3:
- Use devm_ioremap_resource API instead of devm_request_and_ioremap.
- Update commit message.
- Rebase on top of v3.9-rc1 linus tree.
Changes since V2:
- if "devm_request_and_ioremap" fails return -EADDRNOTAVAIL.
instead of -EBUSY.
Changes since V1:
- Rebase on top of v3.8-rc6 of linus tree.
- Apply devm operation on clk_get.

:100644 100644 7d1e590... 1fb5a22... M drivers/i2c/busses/i2c-davinci.c
drivers/i2c/busses/i2c-davinci.c | 49 +++++++++++--------------------------
1 files changed, 15 insertions(+), 34 deletions(-)

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 7d1e590..1fb5a22 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -643,7 +643,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
{
struct davinci_i2c_dev *dev;
struct i2c_adapter *adap;
- struct resource *mem, *irq, *ioarea;
+ struct resource *mem, *irq;
int r;

/* NOTE: driver uses the static register mapping */
@@ -659,17 +659,11 @@ static int davinci_i2c_probe(struct platform_device *pdev)
return -ENODEV;
}

- ioarea = request_mem_region(mem->start, resource_size(mem),
- pdev->name);
- if (!ioarea) {
- dev_err(&pdev->dev, "I2C region already claimed\n");
- return -EBUSY;
- }
-
- dev = kzalloc(sizeof(struct davinci_i2c_dev), GFP_KERNEL);
+ dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_i2c_dev),
+ GFP_KERNEL);
if (!dev) {
- r = -ENOMEM;
- goto err_release_region;
+ dev_err(&pdev->dev, "Memory allocation failed\n");
+ return -ENOMEM;
}

init_completion(&dev->cmd_complete);
@@ -699,22 +693,24 @@ static int davinci_i2c_probe(struct platform_device *pdev)
dev->pdata = &davinci_i2c_platform_data_default;
}

- dev->clk = clk_get(&pdev->dev, NULL);
+ dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk)) {
r = -ENODEV;
goto err_free_mem;
}
clk_prepare_enable(dev->clk);

- dev->base = ioremap(mem->start, resource_size(mem));
- if (!dev->base) {
- r = -EBUSY;
- goto err_mem_ioremap;
+ dev->base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dev->base)) {
+ r = PTR_ERR(dev->base);
+ dev_err(&pdev->dev, "I2C region already claimed\n");
+ goto err_unuse_clocks;
}

i2c_davinci_init(dev);

- r = request_irq(dev->irq, i2c_davinci_isr, 0, pdev->name, dev);
+ r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
+ pdev->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
goto err_unuse_clocks;
@@ -723,7 +719,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
r = i2c_davinci_cpufreq_register(dev);
if (r) {
dev_err(&pdev->dev, "failed to register cpufreq\n");
- goto err_free_irq;
+ goto err_unuse_clocks;
}

adap = &dev->adapter;
@@ -740,25 +736,17 @@ static int davinci_i2c_probe(struct platform_device *pdev)
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
- goto err_free_irq;
+ goto err_unuse_clocks;
}
of_i2c_register_devices(adap);

return 0;

-err_free_irq:
- free_irq(dev->irq, dev);
err_unuse_clocks:
- iounmap(dev->base);
-err_mem_ioremap:
clk_disable_unprepare(dev->clk);
- clk_put(dev->clk);
dev->clk = NULL;
err_free_mem:
put_device(&pdev->dev);
- kfree(dev);
-err_release_region:
- release_mem_region(mem->start, resource_size(mem));

return r;
}
@@ -766,7 +754,6 @@ err_release_region:
static int davinci_i2c_remove(struct platform_device *pdev)
{
struct davinci_i2c_dev *dev = platform_get_drvdata(pdev);
- struct resource *mem;

i2c_davinci_cpufreq_deregister(dev);

@@ -774,16 +761,10 @@ static int davinci_i2c_remove(struct platform_device *pdev)
put_device(&pdev->dev);

clk_disable_unprepare(dev->clk);
- clk_put(dev->clk);
dev->clk = NULL;

davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0);
- free_irq(dev->irq, dev);
- iounmap(dev->base);
- kfree(dev);

- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- release_mem_region(mem->start, resource_size(mem));
return 0;
}

--
1.7.4.1


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