Commit ff0bc501 authored by Jan Kardell's avatar Jan Kardell Committed by Linus Torvalds

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: default avatarJan Kardell <jan.kardell@telliq.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 599cda55
...@@ -42,6 +42,13 @@ ...@@ -42,6 +42,13 @@
#define PCF8563_REG_CLKO 0x0D /* clock out */ #define PCF8563_REG_CLKO 0x0D /* clock out */
#define PCF8563_REG_TMRC 0x0E /* timer control */ #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_REG_TMR 0x0F /* timer */
#define PCF8563_SC_LV 0x80 /* low voltage */ #define PCF8563_SC_LV 0x80 /* low voltage */
...@@ -406,6 +413,7 @@ static int pcf8563_probe(struct i2c_client *client, ...@@ -406,6 +413,7 @@ static int pcf8563_probe(struct i2c_client *client,
{ {
struct pcf8563 *pcf8563; struct pcf8563 *pcf8563;
int err; int err;
unsigned char buf;
dev_dbg(&client->dev, "%s\n", __func__); dev_dbg(&client->dev, "%s\n", __func__);
...@@ -423,6 +431,14 @@ static int pcf8563_probe(struct i2c_client *client, ...@@ -423,6 +431,14 @@ static int pcf8563_probe(struct i2c_client *client,
pcf8563->client = client; pcf8563->client = client;
device_set_wakeup_capable(&client->dev, 1); 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->rtc = devm_rtc_device_register(&client->dev,
pcf8563_driver.driver.name, pcf8563_driver.driver.name,
&pcf8563_rtc_ops, THIS_MODULE); &pcf8563_rtc_ops, THIS_MODULE);
......
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