diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 4ba589ab861..0506fef8dc0 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -36,6 +36,7 @@ #include <linux/interrupt.h> #include <linux/of_i2c.h> #include <linux/platform_device.h> +#include <linux/pm.h> #include <linux/io.h> #include <linux/slab.h> #include "i2c-designware-core.h" @@ -95,7 +96,7 @@ static int __devinit dw_i2c_probe(struct platform_device *pdev) r = -ENODEV; goto err_free_mem; } - clk_enable(dev->clk); + clk_prepare_enable(dev->clk); dev->functionality = I2C_FUNC_I2C | @@ -155,7 +156,7 @@ err_free_irq: err_iounmap: iounmap(dev->base); err_unuse_clocks: - clk_disable(dev->clk); + clk_disable_unprepare(dev->clk); clk_put(dev->clk); dev->clk = NULL; err_free_mem: @@ -177,7 +178,7 @@ static int __devexit dw_i2c_remove(struct platform_device *pdev) i2c_del_adapter(&dev->adapter); put_device(&pdev->dev); - clk_disable(dev->clk); + clk_disable_unprepare(dev->clk); clk_put(dev->clk); dev->clk = NULL; @@ -198,6 +199,31 @@ static const struct of_device_id dw_i2c_of_match[] = { MODULE_DEVICE_TABLE(of, dw_i2c_of_match); #endif +#ifdef CONFIG_PM +static int dw_i2c_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); + + clk_disable_unprepare(i_dev->clk); + + return 0; +} + +static int dw_i2c_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); + + clk_prepare_enable(i_dev->clk); + i2c_dw_init(i_dev); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(dw_i2c_dev_pm_ops, dw_i2c_suspend, dw_i2c_resume); + /* work with hotplug and coldplug */ MODULE_ALIAS("platform:i2c_designware"); @@ -207,6 +233,7 @@ static struct platform_driver dw_i2c_driver = { .name = "i2c_designware", .owner = THIS_MODULE, .of_match_table = of_match_ptr(dw_i2c_of_match), + .pm = &dw_i2c_dev_pm_ops, }, }; |