Add suspend and resume callbacks to DaVinci I2C driver. This has been tested on DA850/OMAP-L138 EVM. The SoC specific suspend-to-RAM support patch series [1] is needed to test this feature.
[1] http://linux.davincidsp.com/pipermail/davinci-linux-open-source/ 2009-November/016958.html Signed-off-by: Chaithrika U S <[email protected]> --- drivers/i2c/busses/i2c-davinci.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 5f3838c..5f0888d 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -623,6 +623,36 @@ static int davinci_i2c_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM +static int davinci_i2c_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct davinci_i2c_dev *dev = platform_get_drvdata(pdev); + + /* put I2C into reset */ + davinci_i2c_reset_ctrl(dev, 0); + + clk_disable(dev->clk); + + return 0; +} + +static int davinci_i2c_resume(struct platform_device *pdev) +{ + struct davinci_i2c_dev *dev = platform_get_drvdata(pdev); + + clk_enable(dev->clk); + + /* take I2C out of reset */ + davinci_i2c_reset_ctrl(dev, 1); + + return 0; +} + +#else +#define davinci_i2c_suspend NULL +#define davinci_i2c_resume NULL +#endif + /* work with hotplug and coldplug */ MODULE_ALIAS("platform:i2c_davinci"); @@ -633,6 +663,8 @@ static struct platform_driver davinci_i2c_driver = { .name = "i2c_davinci", .owner = THIS_MODULE, }, + .suspend = davinci_i2c_suspend, + .resume = davinci_i2c_resume, }; /* I2C may be needed to bring up other drivers */ -- 1.5.6 _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
