From: Oleksij Rempel <fixed-term.Oleksij.Rempel@xxxxxxxxxxxx>
There might be designs where the power supply circuit is designed
in a way that VDETOFF and SWOFF is reuqired to be set. Otherwise the
RTC detects a power loss. Add a device tree interface for this.
Signed-off-by: Carsten Resch <Carsten.Resch@xxxxxxxxxxxx>
Signed-off-by: Dirk Behme <dirk.behme@xxxxxxxxxxxx>
Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel@xxxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
---
drivers/rtc/rtc-rv8803.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index 62baddd..2566d67 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -50,6 +50,10 @@
#define RV8803_CTRL_TIE BIT(4)
#define RV8803_CTRL_UIE BIT(5)
+#define RX8900_BACKUP_CTRL 0x18
+#define RX8900_FLAG_SWOFF BIT(2)
+#define RX8900_FLAG_VDETOFF BIT(3)
+
struct rv8803_data {
struct i2c_client *client;
struct rtc_device *rtc;
@@ -423,6 +427,35 @@ static struct rtc_class_ops rv8803_rtc_ops = {
.ioctl = rv8803_ioctl,
};
+static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
+{
+ struct i2c_client *client = rv8803->client;
+ struct device_node *node = client->dev.of_node;
+ int err;
+ u8 flags;
+
+ if (!node)
+ return 0;
+
+ if (!of_device_is_compatible(node, "epson,rx8900"))
+ return 0;
+
+ err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
+ if (err < 0)
+ return err;
+
+ flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err;
+
+ if (of_property_read_bool(node, "epson,vdetoff"))
+ flags |= RX8900_FLAG_VDETOFF;
+
+ if (of_property_read_bool(node, "trickle-diode-disable"))
+ flags |= RX8900_FLAG_SWOFF;
+
+ return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
+ flags);
+}
+
static int rv8803_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -498,6 +531,12 @@ static int rv8803_probe(struct i2c_client *client,
if (err)
return err;
+ err = rx8900_trickle_charger_init(rv8803);
+ if (err) {
+ dev_err(&client->dev, "failed to init charger\n");
+ return err;
+ }
+
err = device_create_bin_file(&client->dev, &rv8803_nvram_attr);
if (err)
return err;
--
2.8.0
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