drivers: lora: sx1276: support RFI/RFO/PA_BOOST antenna selection
There are several antenna path designs on SX1276 compatible boards in
the wild. B-L072Z-LRWAN1 board has dedicated enable pins for RFI, RFO
and PA_BOOST. This is exactly what this patch allows to
configure. Second variant of antenna selection is done with a single
GPIO pin, which controls RF SPDT switches (input or output). This is
also supported, when either 'rfo-enable-gpios' or
'pa-boost-enable-gpios' property is provided alone (RFO/PA_BOOST is
selected only when transmitting, so there is no need for explicit
'rfi-enable-gpios' configuration).
Drop requirement for 'power-amplifier-output' DT property when there is
either 'rfo-enable-gpios' or 'pa-boost-enable-gpios' configured. Fail
using BUILD_ASSERT() when neither is specified.
Make the SX1276SetAntSw() logic similar to loramac-node examples
implementation, so RFO/PA_BOOST is enabled only in
RFLR_OPMODE_TRANSMITTER.
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
2 files changed
