On resume, reinit hardware to ensure state machine and clock settings
are proper. This code assumes:
* bus clock is a fixed value, so no need to recalculate timings after probe
* handling RuntimePM is not needed, because register content is kept
when disabling the IP core clock
Tested with r8a7796 (M3-W) and r8a7790 (H2).
Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
@Geert: do you agree to my assumptions?
drivers/i2c/busses/i2c-rcar.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 26f2ff22e97e55..7010c77df11daa 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -907,10 +907,27 @@ static int rcar_i2c_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int rcar_i2c_resume(struct device *dev)
+{
+ struct rcar_i2c_priv *priv = dev_get_drvdata(dev);
+
+ rcar_i2c_init(priv);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_i2c_pm, NULL, rcar_i2c_resume);
+#define RCAR_I2C_PM (&rcar_i2c_pm)
+#else
+#define RCAR_I2C_PM NULL
+#endif
+
static struct platform_driver rcar_i2c_driver = {
.driver = {
.name = "i2c-rcar",
.of_match_table = rcar_i2c_dt_ids,
+ .pm = RCAR_I2C_PM,
},
.probe = rcar_i2c_probe,
.remove = rcar_i2c_remove,
--
2.11.0
