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rtc: rv8803: factor out existing register initialization to function

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The driver probe currently initializes some registers to non-POR
values. These values are not reinstated if the RTC experiences voltage
loss later on. Prepare for fixing this by factoring out the
initialization to a separate function.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220426071056.1187235-2-s.hauer@pengutronix.de
This commit is contained in:
Ahmad Fatoum 2022-04-26 09:10:52 +02:00 committed by Alexandre Belloni
parent d2a632a8a1
commit 8c798e1ec1
1 changed files with 29 additions and 14 deletions
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43
drivers/rtc/rtc-rv8803.c
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@ -64,6 +64,7 @@ struct rv8803_data {
struct rtc_device *rtc;
struct mutex flags_lock;
u8 ctrl;
u8 backup;
enum rv8803_type type;
};
@ -498,18 +499,32 @@ static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
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;
flags = (u8)err;
flags &= ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF);
flags |= rv8803->backup;
return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
flags);
}
/* configure registers with values different than the Power-On reset defaults */
static int rv8803_regs_configure(struct rv8803_data *rv8803)
{
int err;
err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
if (err)
return err;
err = rx8900_trickle_charger_init(rv8803);
if (err) {
dev_err(&rv8803->client->dev, "failed to init charger\n");
return err;
}
return 0;
}
static int rv8803_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -576,16 +591,16 @@ static int rv8803_probe(struct i2c_client *client,
if (!client->irq)
clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features);
err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
if (of_property_read_bool(client->dev.of_node, "epson,vdet-disable"))
rv8803->backup |= RX8900_FLAG_VDETOFF;
if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable"))
rv8803->backup |= RX8900_FLAG_SWOFF;
err = rv8803_regs_configure(rv8803);
if (err)
return err;
err = rx8900_trickle_charger_init(rv8803);
if (err) {
dev_err(&client->dev, "failed to init charger\n");
return err;
}
rv8803->rtc->ops = &rv8803_rtc_ops;
rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;