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authorDeepak Sikri <deepak.sikri@st.com>2012-02-24 17:01:15 +0530
committerWolfram Sang <w.sang@pengutronix.de>2012-05-12 14:28:15 +0200
commit3bf3b289c233c28aaef16546168a994070aa24a0 (patch)
tree811ed056c38c3b5cf3aaaadee7b9bf50493eab5a /drivers/i2c
parent6923229380bc8ac112f4e6e76d05542c006feaad (diff)
i2c: designware: add PM support
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 4ba589ab8614..f08d0248cf6b 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"
@@ -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,
},
};