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authorChaithrika U S <chaithrika@ti.com>2010-01-06 14:54:59 +0530
committerKevin Hilman <khilman@deeprootsystems.com>2010-08-05 09:38:32 -0700
commit68f15de976f8f90d3bc0d10160aa20b0528760d4 (patch)
treecebffb687c98e750a908a95a8b9049814e6c8716 /drivers/i2c
parent5ae5b1136e0c434b076ab1f9cb39deebf6187f55 (diff)
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-davinci.c36
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,
},
};