atmel,rf2xx (on spi bus)

Vendor: Atmel Corporation

Description

ATMEL AT86RF2xx 802.15.4 wireless transceiver

Properties

Properties not inherited from the base binding file.

Name

Type

Details

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.

irq-gpios

phandle-array

This property is required.

reset-gpios

phandle-array

This property is required.

slptr-gpios

phandle-array

 
Multi-functional pin that controls sleep, deep sleep, transmit
start and receive states

This property is required.

dig2-gpios

phandle-array

 
RX and TX Frame Time Stamping(TX_ARET)

clkm-gpios

phandle-array

 
Master clock signal output

local-mac-address

uint8-array

 
Specifies the MAC address that was assigned to the network
device

channel-page

int

 
Selects Channel Page accordingly with IEEE 802.15.4 standard. The Page 0
is used in both Sub-Giga and 2.4GHz. It allows select channels 0-10 in
Sub-Giga band (0: BPSK-20, 1-10: BPSK-40) and 11-26 in 2.4GHz band
(11-26: O-QPSK-250). Channel 2 is for Sub-Giga and selects
(0: OQPSK-SIN-RC-100, 1-10: OQPSK-SIN-250). Channel 5 is for Sub-Giga
(JAPAN) and selects (0-3: OQPSK-RC-250) .
  0: Page 0 - BPSK-20 [0], BPSK-40 [1-10], O-QPSK-250 [11-26].
  2: Page 2 - OQPSK-SIN-RC-100 [0], OQPSK-SIN-250 [1-10].
  5: Page 5 - OQPSK-RC-250 [0-3].

Legal values: 0, 2, 5

tx-pwr-table

uint8-array

 
This is the Transmission Power Mapping Table array used to comply with
local regulations. By default this value set an output power above 0dBm
for all transceivers. This property must be used with tx-pwr-min and
tx-pwr-max for normal operations. The number of elements is defined by
the size of the tx-pwr-table array property. The max entry value for
2.4GHz is 0x0f and 0xff for Sub-Giga. See PHY_TX_PWR at datasheet for
more details.

The output power is determined by following formula:

  linear_step = (tx-pwr-max - tx-pwr-min)
              / (sizeof(tx-pwr-table) - 1.0);
  table_index = abs((value_in_dbm - tx-pwr-max) / linear_step);
  output_power = tx-pwr-table[table_index];

Using AT86RF233 as example without external PA. By the datasheet the
tx-pwr-min = -17 dBm and tx-pwr-max = +4 dBm. Using 48 elements in the
tx-pwr-table array. The table array is filled from higher to lower power.

  tx-pwr-min = [01 11]; /* -17.0 dBm */
  tx-pwr-max = [00 04]; /*   4.0 dBm */
  tx-pwr-table = [00 01 03 04 05 05 06 06
                  07 07 07 08 08 09 09 0a
                  0a 0a 0b 0b 0b 0b 0c 0c
                  0c 0c 0d 0d 0d 0d 0d 0d
                  0d 0d 0e 0e 0e 0e 0e 0e
                  0e 0e 0e 0e 0e 0e 0f 0f];

The values in the table are filled based on table 9-9 [TX Output Power]
using the linear step in dBm as:

  linear_step = (4 - (-17)) / (48 - 1) => ~0.45 dBm

Assuming that user wants set 0 dBm as output power:

  table_index = abs((0 - 4) / 0.45) => 8.95 ( round to 9 )
  output_power = tx-pwr-table[9] => 0x07 ( 0 dBm as table 9-9 )

Note when tx-pwr-min is [0x00, 0x00] and tx-pwr-max is [0x00, 0x00]
the linear step is zero. This means that table_index will be always the
first element of the tx-pwr-table array, which is 0x00 by default. This
is defined as general case when user not define any tx-pwr-* entries. It
sets the transceiver to use always a value above 0 dBm as output power.

Default value: [0]

tx-pwr-min

uint8-array

 
This value represent minimum normalized value in dBm for the transceiver
output power. This property must be used when tx-pwr-table is defined.
The value is represented by two entries where first element represents
the signal indication [0x00-positive, 0x01-negative] and second element
is the minimal value in dBm for the transceiver output power. By default,
the combination of tx-pwr-min as [0x00, 0x00] and tx-pwr-max as [0x00,
0x00] will create a fixed transmission power.

Default value: [0, 0]

tx-pwr-max

uint8-array

 
This value represent maximum normalized value in dBm for the transceiver
output power. This property must be used when tx-pwr-table is defined.
The value is represented by two entries where first element represents
the signal indication [ 0x00-positive] and second element is the maximum
value in dBm for the transceiver output power. By default, the
combination of tx-pwr-max as [0x00, 0x00] and tx-pwr-min as [0x00,
0x00] will create a fixed transmission power.

Default value: [0, 0]