From: Oleksij Rempel <fixed-term.oleksij.rem...@de.bosch.com>
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.re...@de.bosch.com>
Signed-off-by: Dirk Behme <dirk.be...@de.bosch.com>
Signed-off-by: Oleksij Rempel <fixed-term.oleksij.rem...@de.bosch.com>
Cc: devicet...@vger.kernel.org
---
drivers/rtc/rtc-rv8803.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 48 insertions(+), 2 deletions(-)
diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
index f623038..0801048 100644
--- a/drivers/rtc/rtc-rv8803.c
+++ b/drivers/rtc/rtc-rv8803.c
@@ -49,11 +49,21 @@
#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)
+
+enum rv8803_type {
+ rv_8803,
+ rx_8900
+};
+
struct rv8803_data {
struct i2c_client *client;
struct rtc_device *rtc;
struct mutex flags_lock;
u8 ctrl;
+ enum rv8803_type type;
};
static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
@@ -422,6 +432,35 @@ 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 (rv8803->type != rx_8900)
+ 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,vdet-disable"))
+ 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)
{
@@ -442,6 +481,7 @@ static int rv8803_probe(struct i2c_client *client,
mutex_init(&rv8803->flags_lock);
rv8803->client = client;
+ rv8803->type = id->driver_data;
i2c_set_clientdata(client, rv8803);
/*
@@ -497,6 +537,12 @@ 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;
@@ -514,8 +560,8 @@ static int rv8803_remove(struct i2c_client *client)
}
static const struct i2c_device_id rv8803_id[] = {
- { "rv8803", 0 },
- { "rx8900", 0 },
+ { "rv8803", rv_8803 },
+ { "rx8900", rx_8900 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rv8803_id);
--
1.9.1
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