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From: Kevin Hilman on 6 Apr 2010 13:50
From: Chaithrika U S <chaithrika(a)ti.com>

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(a)ti.com>
Acked-by: Kevin Hilman <khilman(a)deeprootsystems.com>
---
drivers/i2c/busses/i2c-davinci.c | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 9239d2b..dfec296 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -645,6 +645,41 @@ 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");

@@ -654,6 +689,7 @@ static struct platform_driver davinci_i2c_driver = {
.driver = {
.name = "i2c_davinci",
.owner = THIS_MODULE,
+ .pm = davinci_i2c_pm_ops,
},
};

--
1.7.0.2

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Prev: [patch] jbd: tag journal writes as metadata I/O
Next: [PATCH 6/6] i2c: davinci: bus recovery procedure to clear the bus