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>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index c4593a24331c8284d41df2184e059a75f89f0fd3..9f4e22cdf82c8c8d0b19be4a746e3e8b78c178b8 100644 (file)
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -598,7 +598,6 @@ 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;
@@ -611,50 +610,41 @@ static int __devinit tegra_i2c_probe(struct platform_device *pdev)
                dev_err(&pdev->dev, "no mem resource\n");
                return -EINVAL;
        }
-       iomem = request_mem_region(res->start, resource_size(res), pdev->name);
-       if (!iomem) {
-               dev_err(&pdev->dev, "I2C region already claimed\n");
-               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\n");
-               return -ENOMEM;
+               dev_err(&pdev->dev, "Cannot request/ioremap I2C registers\n");
+               return -EADDRNOTAVAIL;
        }
 
        res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
        if (!res) {
                dev_err(&pdev->dev, "no irq resource\n");
-               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;
@@ -683,13 +673,14 @@ 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\n", i2c_dev->irq);
-               goto err_free;
+               return ret;
        }
 
        clk_enable(i2c_dev->i2c_clk);
@@ -707,38 +698,19 @@ 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\n");
-               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;
 }