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rtc: rv8803: set VDETOFF and SWOFF via device tree 

There might be designs where the power supply circuit is designed
in a way that VDETOFF and SWOFF is required to be set. Otherwise the
RTC detects a power loss. Add a device tree interface for this.

Signed-off-by: Carsten Resch <Carsten.Resch@de.bosch.com>
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel@de.bosch.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Oleksij Rempel 2016-06-29 16:40:01 +02:00 committed by Alexandre Belloni
parent eff6675b5c
commit 1cd713762e
1 changed files with 48 additions and 2 deletions
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50
drivers/rtc/rtc-rv8803.c
View File

@ -52,11 +52,21 @@
#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 int rv8803_read_reg(const struct i2c_client *client, u8 reg)
@ -497,6 +507,35 @@ 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)
{
@ -517,6 +556,7 @@ 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);
flags = rv8803_read_reg(client, RV8803_FLAG);
@ -558,6 +598,12 @@ 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;
@ -575,8 +621,8 @@ 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);