i2c: rcar: add suspend/resume support

Because the adapter will be set up before every transaction anyhow, we
just need to mark it as suspended to the I2C core.

Signed-off-by: Hiromitsu Yamasaki <hiromitsu.yamasaki.ym@renesas.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-rcar.c

@@ -1017,10 +1017,35 @@ static int rcar_i2c_remove(struct platform_device *pdev)
  return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int rcar_i2c_suspend(struct device *dev)
+{
+ struct rcar_i2c_priv *priv = dev_get_drvdata(dev);
+
+ i2c_mark_adapter_suspended(&priv->adap);
+ return 0;
+}
+
+static int rcar_i2c_resume(struct device *dev)
+{
+ struct rcar_i2c_priv *priv = dev_get_drvdata(dev);
+
+ i2c_mark_adapter_resumed(&priv->adap);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_i2c_pm_ops, rcar_i2c_suspend, rcar_i2c_resume);
+
+#define DEV_PM_OPS (&rcar_i2c_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
 static struct platform_driver rcar_i2c_driver = {
  .driver = {
  .name = "i2c-rcar",
  .of_match_table = rcar_i2c_dt_ids,
+ .pm = DEV_PM_OPS,
  },
  .probe = rcar_i2c_probe,
  .remove = rcar_i2c_remove,