rtc: pm8xxx: use unaligned le32 helpers

Use the unaligned le32 helpers instead of open coding when accessing the
time and alarm registers.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: David Collins <quic_collinsd@quicinc.com>
Link: https://lore.kernel.org/r/20230202155448.6715-8-johan+linaro@kernel.orgSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-pm8xxx.c

@@ -12,6 +12,8 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
+#include <asm/unaligned.h>
+
 /* RTC_CTRL register bit fields */
 #define PM8xxx_RTC_ENABLE		BIT(7)
 #define PM8xxx_RTC_ALARM_CLEAR		BIT(0)
@@ -68,25 +70,21 @@ struct pm8xxx_rtc {
  */
 static int pm8xxx_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
-	int rc, i;
 	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
 	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
 	u8 value[NUM_8_BIT_RTC_REGS];
 	bool alarm_enabled;
 	unsigned long secs;
+	int rc;
 
 	if (!rtc_dd->allow_set_time)
 		return -ENODEV;
 
 	secs = rtc_tm_to_time64(tm);
+	put_unaligned_le32(secs, value);
 
 	dev_dbg(dev, "Seconds value to be written to RTC = %lu\n", secs);
 
-	for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
-		value[i] = secs & 0xFF;
-		secs >>= 8;
-	}
-
 	rc = regmap_update_bits_check(rtc_dd->regmap, regs->alarm_ctrl,
 				      regs->alarm_en, 0, &alarm_enabled);
 	if (rc)
@@ -157,9 +155,7 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
 			return rc;
 	}
 
-	secs = value[0] | (value[1] << 8) | (value[2] << 16) |
-	       ((unsigned long)value[3] << 24);
-
+	secs = get_unaligned_le32(value);
 	rtc_time64_to_tm(secs, tm);
 
 	dev_dbg(dev, "secs = %lu, h:m:s == %ptRt, y-m-d = %ptRdr\n", secs, tm, tm);
@@ -169,18 +165,14 @@ static int pm8xxx_rtc_read_time(struct device *dev, struct rtc_time *tm)
 
 static int pm8xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
-	int rc, i;
 	u8 value[NUM_8_BIT_RTC_REGS];
 	struct pm8xxx_rtc *rtc_dd = dev_get_drvdata(dev);
 	const struct pm8xxx_rtc_regs *regs = rtc_dd->regs;
 	unsigned long secs;
+	int rc;
 
 	secs = rtc_tm_to_time64(&alarm->time);
-
-	for (i = 0; i < NUM_8_BIT_RTC_REGS; i++) {
-		value[i] = secs & 0xFF;
-		secs >>= 8;
-	}
+	put_unaligned_le32(secs, value);
 
 	rc = regmap_update_bits(rtc_dd->regmap, regs->alarm_ctrl,
 				regs->alarm_en, 0);
@@ -219,9 +211,7 @@ static int pm8xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 	if (rc)
 		return rc;
 
-	secs = value[0] | (value[1] << 8) | (value[2] << 16) |
-	       ((unsigned long)value[3] << 24);
-
+	secs = get_unaligned_le32(value);
 	rtc_time64_to_tm(secs, &alarm->time);
 
 	rc = regmap_read(rtc_dd->regmap, regs->alarm_ctrl, &ctrl_reg);