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| author |   Chaithrika U S <chaithrika@ti.com> | 2010-01-06 14:54:59 +0530 |
|---|---|---|
| committer |   Kevin Hilman <khilman@deeprootsystems.com> | 2010-08-05 09:38:32 -0700 |
| commit | 68f15de976f8f90d3bc0d10160aa20b0528760d4 (patch) | |
| tree | cebffb687c98e750a908a95a8b9049814e6c8716 /drivers/i2c | |
| parent | i2c: davinci: Add helper functions for power management (diff) | |
| download | linux-dev-68f15de976f8f90d3bc0d10160aa20b0528760d4.tar.xz linux-dev-68f15de976f8f90d3bc0d10160aa20b0528760d4.zip | |
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.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 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, }, }; |