The patch titled
Subject: rtc: pcf8563: save battery power
has been added to the -mm tree. Its filename is
rtc-pcf8563-save-battery-power.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/rtc-pcf8563-save-battery-power.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/rtc-pcf8563-save-battery-power.patch
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------------------------------------------------------
From: Jan Kardell <jan.kardell@xxxxxxxxxx>
Subject: rtc: pcf8563: save battery power
According to Haoyu hym8563 datasheet this saves som power. Might be
importat to battery life. And maybe it works for the NXP part as well.
Signed-off-by: Jan Kardell <jan.kardell@xxxxxxxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Vincent Donnefort <vdonnefort@xxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-pcf8563.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff -puN drivers/rtc/rtc-pcf8563.c~rtc-pcf8563-save-battery-power drivers/rtc/rtc-pcf8563.c
--- a/drivers/rtc/rtc-pcf8563.c~rtc-pcf8563-save-battery-power
+++ a/drivers/rtc/rtc-pcf8563.c
@@ -42,6 +42,13 @@
#define PCF8563_REG_CLKO 0x0D /* clock out */
#define PCF8563_REG_TMRC 0x0E /* timer control */
+#define PCF8563_TMRC_ENABLE BIT(7)
+#define PCF8563_TMRC_4096 0
+#define PCF8563_TMRC_64 1
+#define PCF8563_TMRC_1 2
+#define PCF8563_TMRC_1_60 3
+#define PCF8563_TMRC_MASK 3
+
#define PCF8563_REG_TMR 0x0F /* timer */
#define PCF8563_SC_LV 0x80 /* low voltage */
@@ -406,6 +413,7 @@ static int pcf8563_probe(struct i2c_clie
{
struct pcf8563 *pcf8563;
int err;
+ unsigned char buf;
dev_dbg(&client->dev, "%s\n", __func__);
@@ -423,6 +431,14 @@ static int pcf8563_probe(struct i2c_clie
pcf8563->client = client;
device_set_wakeup_capable(&client->dev, 1);
+ /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
+ buf = PCF8563_TMRC_1_60;
+ err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
+ if (err < 0) {
+ dev_err(&client->dev, "%s: write error\n", __func__);
+ return err;
+ }
+
pcf8563->rtc = devm_rtc_device_register(&client->dev,
pcf8563_driver.driver.name,
&pcf8563_rtc_ops, THIS_MODULE);
_
Patches currently in -mm which might be from jan.kardell@xxxxxxxxxx are
rtc-pcf8563-remove-leftover-code.patch
rtc-pcf8563-fix-write-of-invalid-bits-to-st2-reg.patch
rtc-pcf8563-fix-wrong-time-from-read_alarm.patch
rtc-pcf8563-handle-consequeces-of-lacking-second-alarm-reg.patch
rtc-pcf8563-save-battery-power.patch
rtc-pcf8563-clear-expired-alarm-at-boot-time.patch
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