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rtc: pcf85363: add support for the quartz-load-femtofarads property

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The quartz oscillator load capacitance of the PCF85263 and PCF85363 can
be adjusted to 6 pF, 7 pF (default) and 12.5 pF with the CL[1:0] bits in
the oscillator control register (address 25h).

Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net>
Link: https://lore.kernel.org/r/20230215081815.3141776-3-javier.carrasco@wolfvision.net
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Javier Carrasco 2023-02-15 09:18:15 +01:00 committed by Alexandre Belloni
parent 1b2f85a8ba
commit fd9a6a1394
1 changed files with 36 additions and 1 deletions
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37
drivers/rtc/rtc-pcf85363.c
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@ -101,6 +101,10 @@
#define PIN_IO_INTA_OUT 2
#define PIN_IO_INTA_HIZ 3
#define OSC_CAP_SEL GENMASK(1, 0)
#define OSC_CAP_6000 0x01
#define OSC_CAP_12500 0x02
#define STOP_EN_STOP BIT(0)
#define RESET_CPR 0xa4
@ -117,6 +121,32 @@ struct pcf85x63_config {
unsigned int num_nvram;
};
static int pcf85363_load_capacitance(struct pcf85363 *pcf85363, struct device_node *node)
{
u32 load = 7000;
u8 value = 0;
of_property_read_u32(node, "quartz-load-femtofarads", &load);
switch (load) {
default:
dev_warn(&pcf85363->rtc->dev, "Unknown quartz-load-femtofarads value: %d. Assuming 7000",
load);
fallthrough;
case 7000:
break;
case 6000:
value = OSC_CAP_6000;
break;
case 12500:
value = OSC_CAP_12500;
break;
}
return regmap_update_bits(pcf85363->regmap, CTRL_OSCILLATOR,
OSC_CAP_SEL, value);
}
static int pcf85363_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct pcf85363 *pcf85363 = dev_get_drvdata(dev);
@ -372,7 +402,7 @@ static int pcf85363_probe(struct i2c_client *client)
.reg_write = pcf85363_nvram_write,
},
};
int ret, i;
int ret, i, err;
if (data)
config = data;
@ -394,6 +424,11 @@ static int pcf85363_probe(struct i2c_client *client)
if (IS_ERR(pcf85363->rtc))
return PTR_ERR(pcf85363->rtc);
err = pcf85363_load_capacitance(pcf85363, client->dev.of_node);
if (err < 0)
dev_warn(&client->dev, "failed to set xtal load capacitance: %d",
err);
pcf85363->rtc->ops = &rtc_ops;
pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
pcf85363->rtc->range_max = RTC_TIMESTAMP_END_2099;