linux-toradex.git/drivers/rtc/rtc-ds1307.c, branch v4.7-rc2

rtc: ds1307: Remove CLK_IS_ROOT

2016-05-20T10:33:51+00:00

This flag is a no-op now (see commit 47b0eeb3dc8a "clk: Deprecate
CLK_IS_ROOT", 2016-02-02) so remove it.

Cc: Akinobu Mita 
Cc: Michael Tatarinov 
Signed-off-by: Stephen Boyd 
Signed-off-by: Alexandre Belloni

rtc: ds1307: ensure that any pending alarm is cleared before a new alarm is enabled

2016-05-20T10:33:51+00:00

If a previously-set alarm was disabled and then triggered, it may still
be pending when a new alarm is configured.

Then, if the alarm is enabled before the pending alarm is cleared, then
an interrupt is immediately raised.

Unfortunately, when the alarm is cleared and enabled during the same I²C
block write, the chip (at least the DS1339 I have) considers that the
alarm is enabled before it is cleared, and raises an interrupt.

This patch ensures that the pending alarm is cleared before the alarm is
enabled.

Signed-off-by: Nicolas Boullis 
Signed-off-by: Alexandre Belloni

rtc: ds1307: fix ds1307_native_smbus_read_block_data function

2016-05-20T10:33:51+00:00

The i2c_smbus_read_i2c_block_data function returns 0 on success, not the
number of bytes written.

Hence, when there are 32 bytes or less to send, the
ds1307_native_smbus_write_block_data function returns 0 on success,
while it returns the number of bytes when there are more than 32.

The ds1307_write_block_data always returns the number of bytes on
success.

Signed-off-by: Nicolas Boullis 
Signed-off-by: Alexandre Belloni

rtc: ds1307: Use irq when available for wakeup-source device

2016-04-21T21:21:00+00:00

With commit 8bc2a40730ec ("rtc: ds1307: add support for the
DT property 'wakeup-source'") we lost the ability for rtc irq
functionality for devices that are actually hooked on a real IRQ
line and have capability to wakeup as well. This is not an expected
behavior. So, instead of just not requesting IRQ, skip the IRQ
requirement only if interrupts are not defined for the device.

Fixes: 8bc2a40730ec ("rtc: ds1307: add support for the DT property 'wakeup-source'")
Reported-by: Tony Lindgren 
Cc: Michael Lange 
Cc: Alexandre Belloni 
Signed-off-by: Nishanth Menon 
Signed-off-by: Alexandre Belloni

rtc: ds1307: ds3231 temperature s16 overflow

2016-04-21T21:20:59+00:00

while retrieving temperature from ds3231, the result may be overflow
since s16 is too small for a multiplication with 250.

ie. if temp_buf[0] == 0x2d, the result (s16 temp) will be negative.

Signed-off-by: Akinobu Mita 
Tested-by: Michael Tatarinov 
Signed-off-by: Alexandre Belloni

rtc: ds1307: add clock provider support for DS3231

2016-03-14T16:08:13+00:00

DS3231 has programmable square-wave output signal.
This enables to use this feature as a clock provider of
common clock framework.

Signed-off-by: Akinobu Mita 
Reviewed-by: Michael Turquette 
Signed-off-by: Alexandre Belloni

rtc: ds1307: add temperature sensor support for ds3231

2016-02-04T22:44:17+00:00

DS3231 has the temperature registers with a resolution of 0.25
degree celsius.  This enables to get the value through hwmon.

	# cat /sys/class/i2c-adapter/i2c-2/2-0068/hwmon/hwmon0/temp1_input
	21000

Signed-off-by: Akinobu Mita 
Acked-by: Guenter Roeck 
Signed-off-by: Alexandre Belloni

rtc: ds1307: add support for the DT property 'wakeup-source'

2016-02-04T22:44:17+00:00

For RTC chips with no IRQ directly connected to the SoC, the RTC chip
can be forced as a wakeup source by stating that explicitly in
the device's .dts file using the "wakeup-source" boolean property.
This will guarantee the 'wakealarm' sysfs entry is available on the
device, if supported by the RTC.

With these changes to the driver rtc-ds1307 and the necessary entries
in the .dts file, I get an working ds1337 RTC on the Witty Pi extension
board by UUGear for the Raspberry Pi.

An example for the entry in the .dts file:

	rtc: ds1337@68 {
		compatible = "dallas,ds1337";
		reg = <0x68>;
		wakeup-source;

If the "wakeup-source" property is set, do not request an IRQ.
Set also UIE mode to unsupported, to get a working 'hwclock' binary.

Signed-off-by: Michael Lange 
Signed-off-by: Alexandre Belloni

rtc: use %ph for short hex dumps

2016-01-11T19:19:58+00:00

This makes the generated code slightly smaller.

Signed-off-by: Rasmus Villemoes 
Signed-off-by: Alexandre Belloni

rtc: ds1307: fix alarm reading at probe time

2015-11-26T17:11:26+00:00

With the actual code, read_alarm() always returns -EINVAL when called
during the RTC device registration. This prevents from retrieving an
already configured alarm in hardware.

This patch fixes the issue by moving the HAS_ALARM bit configuration
(if supported by the hardware) above the rtc_device_register() call.

Signed-off-by: Simon Guinot 
Signed-off-by: Alexandre Belloni