i2c: mv64xxx: add suspend/resume support

This commit implements suspend/resume support in the mv64xxx I2C
controller driver. There is no need to implement a ->suspend() hook, as
calling mv64xxx_i2c_hw_init() at ->resume() time is enough.

Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Reviewed-by: Nadav Haklai <nadavh@marvell.com>
Reviewed-by: Lior Amsalem <alior@marvell.com>
Tested-by: Lior Amsalem <alior@marvell.com>
[Thomas: switch to dev_pm_ops, fix build warning when !PM.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index b4dec0841bc27396b723acf218351b0bf5ab2ed0..a50bd6891e27b220e3ddaa93f23dc194b2dd542b 100644 (file)
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -977,11 +977,32 @@ mv64xxx_i2c_remove(struct platform_device *dev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int mv64xxx_i2c_resume(struct device *dev)
+{
+       struct platform_device *pdev = to_platform_device(dev);
+       struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(pdev);
+
+       mv64xxx_i2c_hw_init(drv_data);
+
+       return 0;
+}
+
+static const struct dev_pm_ops mv64xxx_i2c_pm = {
+       .resume = mv64xxx_i2c_resume,
+};
+
+#define mv64xxx_i2c_pm_ops (&mv64xxx_i2c_pm)
+#else
+#define mv64xxx_i2c_pm_ops NULL
+#endif
+
 static struct platform_driver mv64xxx_i2c_driver = {
        .probe  = mv64xxx_i2c_probe,
        .remove = mv64xxx_i2c_remove,
        .driver = {
                .name   = MV64XXX_I2C_CTLR_NAME,
+               .pm     = mv64xxx_i2c_pm_ops,
                .of_match_table = mv64xxx_i2c_of_match_table,
        },
 };