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rtc: rx8025: implement RX-8035 support

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The RX-8035 is a newer RTC from EPSON that is very
similar to the RX-8025.

The key difference is in the oscillation stop (XSTP)
bit which is inverted on the RX-8035.

Signed-off-by: Mathew McBride <matt@traverse.com.au>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210709044518.28769-2-matt@traverse.com.au
This commit is contained in:
Mathew McBride 2021-07-09 04:45:17 +00:00 committed by Alexandre Belloni
parent e1aba37569
commit f120e2e33a
1 changed files with 41 additions and 5 deletions
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46
drivers/rtc/rtc-rx8025.c
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@ -60,14 +60,23 @@
#define RX8025_ADJ_DATA_MAX 62
#define RX8025_ADJ_DATA_MIN -62
enum rx_model {
model_rx_unknown,
model_rx_8025,
model_rx_8035,
model_last
};
static const struct i2c_device_id rx8025_id[] = {
{ "rx8025", 0 },
{ "rx8025", model_rx_8025 },
{ "rx8035", model_rx_8035 },
{ }
};
MODULE_DEVICE_TABLE(i2c, rx8025_id);
struct rx8025_data {
struct rtc_device *rtc;
enum rx_model model;
u8 ctrl1;
};
@ -100,10 +109,26 @@ static s32 rx8025_write_regs(const struct i2c_client *client,
length, values);
}
static int rx8025_is_osc_stopped(enum rx_model model, int ctrl2)
{
int xstp = ctrl2 & RX8025_BIT_CTRL2_XST;
/* XSTP bit has different polarity on RX-8025 vs RX-8035.
* RX-8025: 0 == oscillator stopped
* RX-8035: 1 == oscillator stopped
*/
if (model == model_rx_8025)
xstp = !xstp;
return xstp;
}
static int rx8025_check_validity(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct rx8025_data *drvdata = dev_get_drvdata(dev);
int ctrl2;
int xstp;
ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
if (ctrl2 < 0)
@ -117,7 +142,8 @@ static int rx8025_check_validity(struct device *dev)
return -EINVAL;
}
if (!(ctrl2 & RX8025_BIT_CTRL2_XST)) {
xstp = rx8025_is_osc_stopped(drvdata->model, ctrl2);
if (xstp) {
dev_warn(dev, "crystal stopped, date is invalid\n");
return -EINVAL;
}
@ -127,6 +153,7 @@ static int rx8025_check_validity(struct device *dev)
static int rx8025_reset_validity(struct i2c_client *client)
{
struct rx8025_data *drvdata = i2c_get_clientdata(client);
int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
if (ctrl2 < 0)
@ -134,22 +161,28 @@ static int rx8025_reset_validity(struct i2c_client *client)
ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
if (drvdata->model == model_rx_8025)
ctrl2 |= RX8025_BIT_CTRL2_XST;
else
ctrl2 &= ~(RX8025_BIT_CTRL2_XST);
return rx8025_write_reg(client, RX8025_REG_CTRL2,
ctrl2 | RX8025_BIT_CTRL2_XST);
ctrl2);
}
static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
{
struct i2c_client *client = dev_id;
struct rx8025_data *rx8025 = i2c_get_clientdata(client);
int status;
int status, xstp;
rtc_lock(rx8025->rtc);
status = rx8025_read_reg(client, RX8025_REG_CTRL2);
if (status < 0)
goto out;
if (!(status & RX8025_BIT_CTRL2_XST))
xstp = rx8025_is_osc_stopped(rx8025->model, status);
if (xstp)
dev_warn(&client->dev, "Oscillation stop was detected,"
"you may have to readjust the clock\n");
@ -519,6 +552,9 @@ static int rx8025_probe(struct i2c_client *client,
i2c_set_clientdata(client, rx8025);
if (id)
rx8025->model = id->driver_data;
err = rx8025_init_client(client);
if (err)
return err;