semtech,lr1121 (on spi bus)

Description

Semtech LR1121 LoRa Modem

Semtech LR1121 LoRa Modem. It supports 150-960MHz sub-GHz ISM bands, 1.9-2.1GHz Satellite bands,
and the 2.4GHz ISM band.
Unlike LR1110 or LR1120, it is not capable of receiving GNSS or WiFi signals.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

reset-gpios

phandle-array

 
Pin connected to the modem's typically active-low RESET signal.

This property is required.

busy-gpios

phandle-array

 
Pin connected to the modem's typically active-high BUSY signal.

This property is required.

irq-gpios

phandle-array

 
Pin connected to the modem's typically active-high IRQ Pin. It is DIO9 for this driver.

This property is required.

lf-clk

string

 
Low frequency clock source for the radio.
- RC: 32.768KHz RC Oscillator.
- XTAL: 32.768KHz Crystal Oscillator.
- DIO11: 32.768KHz Signal on DIO11.

This property is required.

Legal values: RC, XTAL, DIO11

tcxo-voltage

int

 
TCXO voltage in mV, except 0 where TCXO is disabled.
The default is no TCXO is used.

Default value: 0

Legal values: 1600, 1700, 1800, 2200, 2400, 2700, 3000, 3300, 0

tcxo-power-startup-delay-ms

int

 
Startup delay to let the TCXO stabilize after TCXO power on. 5 ms is usually sufficient.

Default value: 5

rfsw-enable

int

 
RF switch DIO enable bitmask. Pins set here are used to set RF path, unset pins are kept Hi-Z.
- A[0]: DIO5 (RFSW0)
- A[1]: DIO6 (RFSW1)
- A[2]: DIO7 (RFSW2)
- A[3]: DIO8 (RFSW3)
- A[4]: DIO10 (RFSW4)

The default has no pins controlling amplifiers.

Default value: 0

rfsw-standby

int

 
RF switch state in standby mode. See rfsw-enable for mask bit meaning.
Defines which RFSW GPIOs are set high (bit set) or low (bit unset) in the mode.

Default value: 0

rfsw-rx

int

 
RF switch state in RX mode. See rfsw-standby.

Default value: 0

rfsw-tx

int

 
RF switch state in sub-GHz, low-power TX mode. See rfsw-standby.

Default value: 0

rfsw-tx-hp

int

 
RF switch state in sub-GHz, high-power TX mode. See rfsw-standby.

Default value: 0

rfsw-tx-hf

int

 
RF switch state in high-frequency TX mode. See rfsw-standby.

Default value: 0

rfsw-gnss

int

 
RF switch state in GNSS RX mode. See rfsw-standby.

Default value: 0

rfsw-wifi

int

 
RF switch state in WIFI RX mode. See rfsw-standby.

Default value: 0

use-dcdc

boolean

 
Use DCDC regulator instead of LDO (RegMode = 1).

force-ldro

boolean

 
Force usage of Low Data Rate Optimization even in cases where the symbol time is shorter than
16.38ms. Useful for designs using no TCXO or with bad heat dissipation.

rx-boosted

boolean

 
Enable RX boosted mode, which increases the power consumption of
RX mode by ~2mA in exchange for ~2dB sensitivity improvement.

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

Default value: 0

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

Default value: 0

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-lsb-first

boolean

 
The device requires least significant bit first data mode.

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.

spi-cs-high

boolean

 
The device requires the chip select to be active high.

spi-interframe-delay-ns

int

 
Delay in nanoseconds between SPI words.
Default of 0 is special value which will assume to mean half of the SCK period.

Default value: 0

spi-cs-setup-delay-ns

int

 
Delay in nanoseconds to be introduced by the controller after CS is asserted.
Also known as enable lead time.

spi-cs-hold-delay-ns

int

 
Delay in nanoseconds to be introduced by the controller before the CS is de-asserted.
 Also known as enable lag time.

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.