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i2c: designware: add PM support

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This patch adds in support for standby/S2R/hybernate for i2c-designware driver.

Signed-off-by: Deepak Sikri <deepak.sikri@st.com>
Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Deepak Sikri 2012-02-24 17:01:15 +05:30 committed by Wolfram Sang
parent 6923229380
commit 3bf3b289c2
1 changed files with 27 additions and 0 deletions
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27
drivers/i2c/busses/i2c-designware-platdrv.c
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@ -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"
@ -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(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_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,
},
};