[PATCH V1 1/2] i2c: tegra: make all resource allocation through devm_*

Use the devm_* for the memory region allocation, interrupt request,
clock handler request.
By doing this, it does not require to explicitly free it and hence
saving some code.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>

drivers/i2c/busses/i2c-tegra.c | 64 ++++++++++--
1 files changed, 17 insertions(+), 47 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 18067b3..390d379 100644
a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -106,7 +106,6 @@
* @adapter: core i2c layer adapter information
* @clk: clock reference for i2c controller
* @i2c_clk: clock reference for i2c bus
- * @iomem: memory resource for registers
* @base: ioremapped registers cookie
* @cont_id: i2c controller id, used for for packet header
* @irq: irq number of transfer complete interrupt
@@ -124,7 +123,6 @@ struct tegra_i2c_dev {
struct i2c_adapter adapter;
struct clk *clk;
struct clk *i2c_clk;
- struct resource *iomem;
void __iomem *base;
int cont_id;
int irq;
@@ -573,7 +571,6 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev)
struct tegra_i2c_dev *i2c_dev;
struct tegra_i2c_platform_data *pdata = pdev->dev.platform_data;
struct resource *res;
- struct resource *iomem;
struct clk *clk;
struct clk *i2c_clk;
const unsigned int *prop;
@@ -586,50 +583,41 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "no mem resource");
return -EINVAL;
}
- iomem = request_mem_region(res->start, resource_size(res), pdev->name);
- if (!iomem) {
- dev_err(&pdev->dev, "I2C region already claimed");
- return -EBUSY;
- }

- base = ioremap(iomem->start, resource_size(iomem));
+ base = devm_request_and_ioremap(&pdev->dev, res);
if (!base) {
- dev_err(&pdev->dev, "Cannot ioremap I2C region");
- return -ENOMEM;
+ dev_err(&pdev->dev, "Cannot request/ioremap I2C registers");
+ return -EADDRNOTAVAIL;
}

res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res) {
dev_err(&pdev->dev, "no irq resource");
- ret = -EINVAL;
- goto err_iounmap;
+ return -EINVAL;
}
irq = res->start;

- clk = clk_get(&pdev->dev, NULL);
+ clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "missing controller clock");
- ret = PTR_ERR(clk);
- goto err_release_region;
+ return PTR_ERR(clk);
}

- i2c_clk = clk_get(&pdev->dev, "i2c");
+ i2c_clk = devm_clk_get(&pdev->dev, "i2c");
if (IS_ERR(i2c_clk)) {
dev_err(&pdev->dev, "missing bus clock");
- ret = PTR_ERR(i2c_clk);
- goto err_clk_put;
+ return PTR_ERR(i2c_clk);
}

- i2c_dev = kzalloc(sizeof(struct tegra_i2c_dev), GFP_KERNEL);
+ i2c_dev = devm_kzalloc(&pdev->dev, sizeof(*i2c_dev), GFP_KERNEL);
if (!i2c_dev) {
- ret = -ENOMEM;
- goto err_i2c_clk_put;
+ dev_err(&pdev->dev, "Could not allocate struct tegra_i2c_dev");
+ return -ENOMEM;
}

i2c_dev->base = base;
i2c_dev->clk = clk;
i2c_dev->i2c_clk = i2c_clk;
- i2c_dev->iomem = iomem;
i2c_dev->adapter.algo = &tegra_i2c_algo;
i2c_dev->irq = irq;
i2c_dev->cont_id = pdev->id;
@@ -658,13 +646,14 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev)
ret = tegra_i2c_init(i2c_dev);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize i2c controller");
- goto err_free;
+ return ret;
}

- ret = request_irq(i2c_dev->irq, tegra_i2c_isr, 0, pdev->name, i2c_dev);
+ ret = devm_request_irq(&pdev->dev, i2c_dev->irq,
+ tegra_i2c_isr, 0, pdev->name, i2c_dev);
if (ret) {
dev_err(&pdev->dev, "Failed to request irq %i", i2c_dev->irq);
- goto err_free;
+ return ret;
}

clk_enable(i2c_dev->i2c_clk);
@@ -682,38 +671,19 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev)
ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
if (ret) {
dev_err(&pdev->dev, "Failed to add I2C adapter");
- goto err_free_irq;
+ clk_disable(i2c_dev->i2c_clk);
+ return ret;
}

of_i2c_register_devices(&i2c_dev->adapter);

return 0;
-err_free_irq:
- free_irq(i2c_dev->irq, i2c_dev);
-err_free:
- kfree(i2c_dev);
-err_i2c_clk_put:
- clk_put(i2c_clk);
-err_clk_put:
- clk_put(clk);
-err_release_region:
- release_mem_region(iomem->start, resource_size(iomem));
-err_iounmap:
- iounmap(base);
- return ret;
}

static int __devexit tegra_i2c_remove(struct platform_device *pdev)
{
struct tegra_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
i2c_del_adapter(&i2c_dev->adapter);
- free_irq(i2c_dev->irq, i2c_dev);
- clk_put(i2c_dev->i2c_clk);
- clk_put(i2c_dev->clk);
- release_mem_region(i2c_dev->iomem->start,
- resource_size(i2c_dev->iomem));
- iounmap(i2c_dev->base);
- kfree(i2c_dev);
return 0;
}

1.7.1.1

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