The latest development version of this page may be more current than this released 3.7.0 version.

ti,tmag5170 (on spi bus)

Vendor: Texas Instruments

Description

Texas Instruments TMAG5170 high-precision, linear 3D Hall-effect sensor.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

friendly-name

string

 
Human readable string describing the sensor. It can be used to
distinguish multiple instances of the same model (e.g., lid accelerometer
vs. base accelerometer in a laptop) to a host operating system.

This property is defined in the Generic Sensor Property Usages of the HID
Usage Tables specification
(https://usb.org/sites/default/files/hut1_3_0.pdf, section 22.5).

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.

spi-max-frequency

int

 
Maximum clock frequency of device's SPI interface in Hz

This property is required.

duplex

int

 
Duplex mode, full or half. By default it's always full duplex thus 0
as this is, by far, the most common mode.
Use the macros not the actual enum value, here is the concordance
list (see dt-bindings/spi/spi.h)
  0    SPI_FULL_DUPLEX
  2048 SPI_HALF_DUPLEX

Legal values: 0, 2048

frame-format

int

 
Motorola or TI frame format. By default it's always Motorola's,
thus 0 as this is, by far, the most common format.
Use the macros not the actual enum value, here is the concordance
list (see dt-bindings/spi/spi.h)
  0     SPI_FRAME_FORMAT_MOTOROLA
  32768 SPI_FRAME_FORMAT_TI

Legal values: 0, 32768

spi-cpol

boolean

 
SPI clock polarity which indicates the clock idle state.
If it is used, the clock idle state is logic high; otherwise, low.

spi-cpha

boolean

 
SPI clock phase that indicates on which edge data is sampled.
If it is used, data is sampled on the second edge; otherwise, on the first edge.

spi-hold-cs

boolean

 
In some cases, it is necessary for the master to manage SPI chip select
under software control, so that multiple spi transactions can be performed
without releasing it. A typical use case is variable length SPI packets
where the first spi transaction reads the length and the second spi transaction
reads length bytes.

int-gpios

phandle-array

 
This property specifies the connection to ALERT sensor pin.
It will be used by the driver to notify the application about
data ready event. For this property to take effect, the
TMAG5170_TRIGGER must be set in project configuration

operating-mode

int

 
Operating mode of the device.
1 - stand-by mode - in this mode the device waits for application to trigger
the measurement.
2 - active measure mode - continuous sampling on all enabled channels
as fast as possible. Recommended for devices that haven't got
strict power requirements and need frequent sampling.
3 - active trigger mode - in this mode, similar to stand-by mode, the device
wait for application to trigger the measurement, but the time needed to finish
the conversion is shorter than in stand-by mode, on the cost of increased power
consumption.
4 - duty-cycled - after each sample the device goes to sleep and then
automatically wakes up to take another sample. The sleep time is determined
by `sleep-time` property. Recommended for low-power devices that don't need
high frequency sampling.

This property is required.

Legal values: 1, 2, 3, 4

magnetic-channels

string

 
Enables data acquisition of the magnetic axis channel(s)
If axis is enabled more than once, sensor will do pseudo-simultaneous
sampling. Refer to datasheet for more information, By default all axes
are enabled (XYZ) to allow the user to check if the sensor work as expected.
Following options are allowed:
None (chip reset value)
X
Y
XY
Z
ZX
YZ
XYZ (default)
XYX
YXY
YZY
ZYZ
ZXZ
XZX
XYZYX
XYZZYX

Default value: XYZ

Legal values: 'None', 'X', 'Y', 'XY', 'Z', 'ZX', 'YZ', 'XYZ', 'XYX', 'YXY', 'YZY', 'ZYZ', 'ZXZ', 'XZX', 'XYZYX', 'XYZZYX'

x-range

int

 
The maximum and minimum values that can be measured on X axis.
The wider the range, the worse the resolution.
0 = ±50mT (TMAG5170A1)/ ±150mT(TMAG5170A2) - (default; chip reset value)
1 = ±25mT (TMAG5170A1)/ ±75mT(TMAG5170A2)
2 = ±100mT (TMAG5170A1)/ ±300mT(TMAG5170A2)

Legal values: 0, 1, 2

y-range

int

 
The maximum and minimum values that can be measured on Y axis.
The wider the range, the worse the resolution.
0 = ±50mT (TMAG5170A1)/ ±150mT(TMAG5170A2) - (default; chip reset value)
1 = ±25mT (TMAG5170A1)/ ±75mT(TMAG5170A2)
2 = ±100mT (TMAG5170A1)/ ±300mT(TMAG5170A2)

Legal values: 0, 1, 2

z-range

int

 
The maximum and minimum values that can be measured on Z axis.
The wider the range, the worse the resolution.
0 = ±50mT (TMAG5170A1)/ ±150mT(TMAG5170A2) - (default; chip reset value)
1 = ±25mT (TMAG5170A1)/ ±75mT(TMAG5170A2)
2 = ±100mT (TMAG5170A1)/ ±300mT(TMAG5170A2)

Legal values: 0, 1, 2

oversampling

int

 
Enables additional sampling of the sensor data to reduce the noise
effect. If temperature channel is enabled, temperature will be oversampled
too, unless `disable-temperature-oversampling` property is present.
Following options are allowed:
1 (default; chip reset value)
2
4
8
16
32

Default value: 1

Legal values: 1, 2, 4, 8, 16, 32

enable-temperature-channel

boolean

 
Enables temperature measurement

magnet-type

string

 
Enables temperature compensation basing on the type of magnet.
Following options are allowed:
None (default; chip reset value)
NdBFe = 0.12%/deg C
SmCo = 0.03%/deg C
Ceramic = 0.2%/deg C

Default value: None

Legal values: 'None', 'NdBFe', 'SmCo', 'Ceramic'

angle-measurement

string

 
Enable angle calculation using two axis data:
None (default; chip reset value)
XY
YZ
XZ

Default value: None

Legal values: 'None', 'XY', 'YZ', 'XZ'

disable-temperature-oversampling

boolean

 
If true, temperature is always sampled once per conversion set
If false, temperature is oversampled according to `oversampling`
property.

sleep-time

int

 
The time in milliseconds the sensor will be in sleep during conversions.
For this property to take effect sensor must be in `duty-cycled` mode.
Note that to calculate total time between conversions, the conversion time
itself must be taken into account. The conversion time is dependent
on the values of `oversampling`, `magnetic-channels`, `temperature-channel-enabled`
and `disable-temperature-oversampling` properties.
Following value are allowed:
1 (default; chip reset value)
5
10
15
20
30
50
100
500
1000

Default value: 1

Legal values: 1, 5, 10, 15, 20, 30, 50, 100, 500, 1000