diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf85363.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf85363.c | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c index c05b722f0060..8958eadf1c3e 100644 --- a/drivers/rtc/rtc-pcf85363.c +++ b/drivers/rtc/rtc-pcf85363.c @@ -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; @@ -394,18 +424,28 @@ 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; clear_bit(RTC_FEATURE_ALARM, pcf85363->rtc->features); if (client->irq > 0) { + unsigned long irqflags = IRQF_TRIGGER_LOW; + + if (dev_fwnode(&client->dev)) + irqflags = 0; + regmap_write(pcf85363->regmap, CTRL_FLAGS, 0); regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, PIN_IO_INTA_OUT, PIN_IO_INTAPM); ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, pcf85363_rtc_handle_irq, - IRQF_TRIGGER_LOW | IRQF_ONESHOT, + irqflags | IRQF_ONESHOT, "pcf85363", client); if (ret) dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); |