nxp,pcf8523 (on i2c bus)

Vendor: NXP Semiconductors

Note

An implementation of a driver matching this compatible is available in drivers/rtc/rtc_pcf8523.c.

Description

NXP PCF8523 RTC

Properties

Properties not inherited from the base binding file.

Name

Type

Details

quartz-load-femtofarads

int

 
Capacitive load of the quartz crystal in femtofarads (fF). Default is 7000 femtofarads (equal
to 7pF) which corresponds to the reset value of the CAP_SEL field in the "Control 1" register
of the PCF8523.

Default value: 7000

Legal values: 7000, 12500

clkout-frequency

int

 
Frequency of the CLKOUT signal in Hertz (Hz). Default is 32768 Hz which corresponds to the
reset value of the COF field in the Tmr_CLKOUT_ctrl register of the PCF8523. Set to 0 to
disable the CLKOUT signal (High-Z).

Default value: 32768

Legal values: 32768, 16384, 8192, 4096, 1024, 32, 1, 0

battery-switch-over

string

 
Battery switch-over function selection:
  - standard: The power failure condition happens when VDD < VBAT and VDD < Vth(sw)bat
  - direct: The power failure condition happens when VDD < VBAT
  - disabled: Battery switch-over disabled - only one power supply (VDD)

This property is required.

Legal values: 'standard', 'direct', 'disabled'

int1-gpios

phandle-array

 
GPIO connected to the PC8523 INT1 interrupt output. This signal is open-drain, active low.

alarms-count

int

 
Number of alarms supported by RTC device. The number of
alarms defaults to 0, which indicates that the RTC has
no alarms.

supply-gpios

phandle-array

 
GPIO specifier that controls power to the device.

This property should be provided when the device has a dedicated
switch that controls power to the device.  The supply state is
entirely the responsibility of the device driver.

Contrast with vin-supply.

vin-supply

phandle

 
Reference to the regulator that controls power to the device.
The referenced devicetree node must have a regulator compatible.

This property should be provided when device power is supplied
by a shared regulator.  The supply state is dependent on the
request status of all devices fed by the regulator.

Contrast with supply-gpios.  If both properties are provided
then the regulator must be requested before the supply GPIOS is
set to an active state, and the supply GPIOS must be set to an
inactive state before releasing the regulator.