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 <[email protected]> --- drivers/rtc/rtc-pcf8563.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c index ce6a11b..1e14f60 100644 --- a/drivers/rtc/rtc-pcf8563.c +++ b/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_client *client, { 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_client *client, 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); -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
