i2c: davinci: Add suspend/resume support

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>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 9afd9af4f550..7afeb28d6d76 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -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,
         },
 };