rtc: pcf2123: don't use weekday alarm

The week day may not be set properly by userspace. This would result is
missed alarms. Disable alarm matching on weekday.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20190819182656.29744-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-pcf2123.c

@@ -82,7 +82,7 @@
 #define OSC_HAS_STOPPED		BIT(7)	/* Clock has been stopped */
 
 /* PCF2123_REG_ALRM_XX BITS */
-#define ALRM_ENABLE		BIT(7)	/* MN, HR, DM, or DW alarm enable */
+#define ALRM_DISABLE		BIT(7)	/* MN, HR, DM, or DW alarm matching */
 
 /* PCF2123_REG_TMR_CLKOUT BITS */
 #define CD_TMR_4096KHZ		(0)	/* 4096 KHz countdown timer */
@@ -288,7 +288,7 @@ static int pcf2123_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
 	txbuf[0] = bin2bcd(alm->time.tm_min & 0x7F);
 	txbuf[1] = bin2bcd(alm->time.tm_hour & 0x3F);
 	txbuf[2] = bin2bcd(alm->time.tm_mday & 0x3F);
-	txbuf[3] = bin2bcd(alm->time.tm_wday & 0x07);
+	txbuf[3] = ALRM_DISABLE;
 
 	ret = regmap_bulk_write(pdata->map, PCF2123_REG_ALRM_MN, txbuf,
 				sizeof(txbuf));