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Commit 1cd71376 authored by Oleksij Rempel's avatar Oleksij Rempel Committed by Alexandre Belloni
Browse files

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: default avatarCarsten Resch <Carsten.Resch@de.bosch.com>
Signed-off-by: default avatarDirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: default avatarOleksij Rempel <fixed-term.Oleksij.Rempel@de.bosch.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent eff6675b

drivers/rtc/rtc-rv8803.c

+48 −2
Original line number Diff line number Diff line
@@ -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);