From: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
The PCF2127 and PCF2129 have one output interrupt pin. The PCF2131 has
two, named INT_A and INT_B. The alarm interrupt can be routed to
either one or both of them.
Signed-off-by: Hugo Villeneuve <hvilleneuve@xxxxxxxxxxxx>
---
drivers/rtc/rtc-pcf2127.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index fdce31e169a6..a75deab47284 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -191,6 +191,7 @@ struct pcf21xx_config {
int max_register;
unsigned int has_nvmem:1;
unsigned int has_bit_wd_ctl_cd0:1;
+ unsigned int has_int_a_b:1; /* PCF2131 supports two interrupt outputs. */
u8 regs_td_base; /* Time/data base registers. */
u8 regs_alarm_base; /* Alarm function base registers. */
u8 reg_wd_ctl; /* Watchdog control register. */
@@ -511,6 +512,39 @@ static int pcf2127_rtc_alarm_irq_enable(struct device *dev, u32 enable)
struct pcf2127 *pcf2127 = dev_get_drvdata(dev);
int ret;
+ if (pcf2127->cfg->has_int_a_b) {
+ /*
+ * The PCF2131 supports two interrupt outputs, INT_A and INT_B.
+ * The alarm interrupt can be routed to either one or both of
+ * them. Make sure that at least one output pin is requested.
+ */
+ if (enable &&
+ !device_property_read_bool(dev, "alarm-output-a") &&
+ !device_property_read_bool(dev, "alarm-output-b")) {
+ dev_warn(dev, "no alarm interrupt output pin selected, alarm function will not work\n");
+ return -EINVAL;
+ }
+
+ if (device_property_read_bool(dev, "alarm-output-a")) {
+ ret = regmap_update_bits(pcf2127->regmap,
+ PCF2131_REG_INT_A_MASK1,
+ PCF2131_BIT_INT_AIE,
+ enable ? PCF2131_BIT_INT_AIE : 0);
+ if (ret)
+ return ret;
+ }
+
+ if (device_property_read_bool(dev, "alarm-output-b")) {
+ ret = regmap_update_bits(pcf2127->regmap,
+ PCF2131_REG_INT_B_MASK1,
+ PCF2131_BIT_INT_AIE,
+ enable ? PCF2131_BIT_INT_AIE : 0);
+ if (ret)
+ return ret;
+ }
+ }
+
+ /* Enable alarm interrupt. */
ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2,
PCF2127_BIT_CTRL2_AIE,
enable ? PCF2127_BIT_CTRL2_AIE : 0);
@@ -878,6 +912,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
.max_register = 0x1d,
.has_nvmem = 1,
.has_bit_wd_ctl_cd0 = 1,
+ .has_int_a_b = 0,
.regs_td_base = PCF2127_REG_TIME_DATE_BASE,
.regs_alarm_base = PCF2127_REG_ALARM_BASE,
.reg_wd_ctl = PCF2127_REG_WD_CTL,
@@ -901,6 +936,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
.max_register = 0x19,
.has_nvmem = 0,
.has_bit_wd_ctl_cd0 = 0,
+ .has_int_a_b = 0,
.regs_td_base = PCF2127_REG_TIME_DATE_BASE,
.regs_alarm_base = PCF2127_REG_ALARM_BASE,
.reg_wd_ctl = PCF2127_REG_WD_CTL,
@@ -924,6 +960,7 @@ static struct pcf21xx_config pcf21xx_cfg[] = {
.max_register = 0x36,
.has_nvmem = 0,
.has_bit_wd_ctl_cd0 = 0,
+ .has_int_a_b = 1,
.regs_td_base = PCF2131_REG_TIME_DATE_BASE,
.regs_alarm_base = PCF2131_REG_ALARM_BASE,
.reg_wd_ctl = PCF2131_REG_WD_CTL,
--
2.30.2
