i2c: davinci: Add suspend/resume support
Chaithrika U S [Wed, 6 Jan 2010 09:24:59 +0000 (14:24 +0530)]
Add suspend and resume callbacks to DaVinci I2C driver.
This has been tested on DA850/OMAP-L138 EVM.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>

drivers/i2c/busses/i2c-davinci.c

index 9afd9af..7afeb28 100644 (file)
@@ -646,6 +646,41 @@ static int davinci_i2c_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int davinci_i2c_suspend(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct davinci_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+       /* put I2C into reset */
+       davinci_i2c_reset_ctrl(i2c_dev, 0);
+       clk_disable(i2c_dev->clk);
+
+       return 0;
+}
+
+static int davinci_i2c_resume(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct davinci_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
+
+       clk_enable(i2c_dev->clk);
+       /* take I2C out of reset */
+       davinci_i2c_reset_ctrl(i2c_dev, 1);
+
+       return 0;
+}
+
+static const struct dev_pm_ops davinci_i2c_pm = {
+       .suspend        = davinci_i2c_suspend,
+       .resume         = davinci_i2c_resume,
+};
+
+#define davinci_i2c_pm_ops (&davinci_i2c_pm)
+#else
+#define davinci_i2c_pm_ops NULL
+#endif
+
 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:i2c_davinci");
 
@@ -655,6 +690,7 @@ static struct platform_driver davinci_i2c_driver = {
        .driver         = {
                .name   = "i2c_davinci",
                .owner  = THIS_MODULE,
+               .pm     = davinci_i2c_pm_ops,
        },
 };