Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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

drivers/rtc/rtc-pcf8563.c

+16 −0
Original line number Diff line number Diff line
@@ -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);