Add DS1341 specific power-saving options that allow to disable certain
functional aspects of the chip in order to minimize its power
consumption.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
.../devicetree/bindings/rtc/dallas,ds1341.txt | 23 ++++++++++++++++++
drivers/rtc/rtc-ds1307.c | 28 ++++++++++++++++++++++
2 files changed, 51 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rtc/dallas,ds1341.txt
diff --git a/Documentation/devicetree/bindings/rtc/dallas,ds1341.txt b/Documentation/devicetree/bindings/rtc/dallas,ds1341.txt
new file mode 100644
index 0000000..b8be7a4
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/dallas,ds1341.txt
@@ -0,0 +1,23 @@
+* Dallas DS1341 I2C Serial Real-Time Clock
+
+Required properties:
+
+- compatible: Should contain "dallas,ds1341".
+
+- reg: I2C address for chip
+
+Optional properties:
+
+- disable-oscillator-stop-flag : Configure chip to disable oscillator
+ fault detection circuitry
+
+- enable-glitch-filter : Configure chip to enable crystal oscillator
+ output glitch filtering
+
+Example:
+ ds1341: rtc@68 {
+ compatible = "dallas,ds1341";
+ disable-oscillator-stop-flag;
+ enable-glitch-filter;
+ reg = <0x68>;
+ };
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index c618c22..54cc527 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -78,6 +78,7 @@ enum ds_type {
#define DS1337_REG_CONTROL 0x0e
# define DS1337_BIT_nEOSC 0x80
# define DS1339_BIT_BBSQI 0x20
+# define DS1341_BIT_EGFIL 0x20
# define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */
# define DS1337_BIT_RS2 0x10
# define DS1337_BIT_RS1 0x08
@@ -93,7 +94,9 @@ enum ds_type {
# define DS1340_BIT_OSF 0x80
#define DS1337_REG_STATUS 0x0f
# define DS1337_BIT_OSF 0x80
+# define DS1341_BIT_DOSF 0x40
# define DS3231_BIT_EN32KHZ 0x08
+# define DS1341_BIT_ECLK 0x04
# define DS1337_BIT_A2I 0x02
# define DS1337_BIT_A1I 0x01
#define DS1339_REG_ALARM1_SECS 0x07
@@ -1319,6 +1322,31 @@ static int ds1307_probe(struct i2c_client *client,
if (ds1307->regs[0] & DS1337_BIT_nEOSC)
ds1307->regs[0] &= ~DS1337_BIT_nEOSC;
+ if (ds1307->type == ds_1341) {
+ /* Make sure we are not generating square wave
+ * output */
+ ds1307->regs[1] &= ~DS1341_BIT_ECLK;
+
+ if (of_property_read_bool(client->dev.of_node,
+ "disable-oscillator-stop-flag"))
+ ds1307->regs[1] |= DS1341_BIT_DOSF;
+ else
+ ds1307->regs[1] &= ~DS1341_BIT_DOSF;
+
+ if (of_property_read_bool(client->dev.of_node,
+ "enable-glitch-filter"))
+ ds1307->regs[0] |= DS1341_BIT_EGFIL;
+ else
+ ds1307->regs[0] &= ~DS1341_BIT_EGFIL;
+
+ /*
+ * Write status register. Control register
+ * would be set by the code below
+ */
+ i2c_smbus_write_byte_data(client, DS1337_REG_STATUS,
+ ds1307->regs[1]);
+ }
+
/*
* Disable the square wave and both alarms.
* For some variants, be sure alarms can trigger when we're
--
2.5.5
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