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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@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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -42,6 +42,13 @@
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#define PCF8563_REG_CLKO 0x0D /* clock out */
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#define PCF8563_REG_TMRC 0x0E /* timer control */
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#define PCF8563_TMRC_ENABLE BIT(7)
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#define PCF8563_TMRC_4096 0
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#define PCF8563_TMRC_64 1
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#define PCF8563_TMRC_1 2
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#define PCF8563_TMRC_1_60 3
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#define PCF8563_TMRC_MASK 3
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#define PCF8563_REG_TMR 0x0F /* timer */
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#define PCF8563_SC_LV 0x80 /* low voltage */
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@ -406,6 +413,7 @@ static int pcf8563_probe(struct i2c_client *client,
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{
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struct pcf8563 *pcf8563;
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int err;
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unsigned char buf;
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dev_dbg(&client->dev, "%s\n", __func__);
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@ -423,6 +431,14 @@ static int pcf8563_probe(struct i2c_client *client,
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pcf8563->client = client;
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device_set_wakeup_capable(&client->dev, 1);
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/* Set timer to lowest frequency to save power (ref Haoyu datasheet) */
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buf = PCF8563_TMRC_1_60;
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err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf);
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if (err < 0) {
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dev_err(&client->dev, "%s: write error\n", __func__);
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return err;
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}
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pcf8563->rtc = devm_rtc_device_register(&client->dev,
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pcf8563_driver.driver.name,
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&pcf8563_rtc_ops, THIS_MODULE);
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