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drivers: lora: sx1276: support antenna power enable

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RF SPDT switches used for RX/TX selection have often power enable pin
connected to MCU's GPIO, so it is possible to disable it to save power
when not doing any data transfers. Add 'antenna-enable-gpios' property
to support such designs.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
This commit is contained in:
Marcin Niestroj 2020-04-07 02:25:20 +02:00 • committed by Carles Cufí
commit af67b297a3
2 changed files with 40 additions and 0 deletions
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34
drivers/lora/sx1276.c
View file

@ -24,6 +24,11 @@ LOG_MODULE_REGISTER(sx1276);
#define GPIO_RESET_FLAGS DT_INST_GPIO_FLAGS(0, reset_gpios)
#define GPIO_CS_PIN DT_INST_SPI_DEV_CS_GPIOS_PIN(0)
#define GPIO_ANTENNA_ENABLE_PIN \
DT_INST_GPIO_PIN(0, antenna_enable_gpios)
#define GPIO_ANTENNA_ENABLE_FLAGS \
DT_INST_GPIO_FLAGS(0, antenna_enable_gpios)
#define GPIO_RFI_ENABLE_PIN \
DT_INST_GPIO_PIN(0, rfi_enable_gpios)
#define GPIO_RFI_ENABLE_FLAGS \
@ -103,6 +108,9 @@ static const struct sx1276_dio sx1276_dios[] = { SX1276_DIO_GPIO_INIT(0) };
static struct sx1276_data {
struct device *reset;
#if DT_INST_NODE_HAS_PROP(0, antenna_enable_gpios)
struct device *antenna_enable;
#endif
#if DT_INST_NODE_HAS_PROP(0, rfi_enable_gpios)
struct device *rfi_enable;
#endif
@ -143,6 +151,13 @@ bool SX1276CheckRfFrequency(uint32_t frequency)
return true;
}
static inline void sx1276_antenna_enable(int val)
{
#if DT_INST_NODE_HAS_PROP(0, antenna_enable_gpios)
gpio_pin_set(dev_data.antenna_enable, GPIO_ANTENNA_ENABLE_PIN, val);
#endif
}
static inline void sx1276_rfi_enable(int val)
{
#if DT_INST_NODE_HAS_PROP(0, rfi_enable_gpios)
@ -172,7 +187,11 @@ void SX1276SetAntSwLowPower(bool low_power)
sx1276_rfi_enable(0);
sx1276_rfo_enable(0);
sx1276_pa_boost_enable(0);
sx1276_antenna_enable(0);
} else {
sx1276_antenna_enable(1);
/* rely on SX1276SetAntSw() to configure proper antenna path */
}
}
@ -443,6 +462,21 @@ static int sx1276_antenna_configure(void)
{
int ret = 0;
#if DT_INST_NODE_HAS_PROP(0, antenna_enable_gpios)
dev_data.antenna_enable = device_get_binding(
DT_INST_GPIO_LABEL(0, antenna_enable_gpios));
if (!dev_data.antenna_enable) {
LOG_ERR("Cannot get pointer to %s device",
DT_INST_GPIO_LABEL(0, antenna_enable_gpios));
return -EIO;
}
ret = gpio_pin_configure(dev_data.antenna_enable,
GPIO_ANTENNA_ENABLE_PIN,
GPIO_OUTPUT_INACTIVE |
GPIO_ANTENNA_ENABLE_FLAGS);
#endif
#if DT_INST_NODE_HAS_PROP(0, rfi_enable_gpios)
dev_data.rfi_enable = device_get_binding(
DT_INST_GPIO_LABEL(0, rfi_enable_gpios));

6
dts/bindings/lora/semtech,sx1276.yaml
View file

@ -37,6 +37,12 @@ properties:
- "rfo"
- "pa-boost"
antenna-enable-gpios:
type: phandle-array
required: false
description: |
Antenna power enable pin.
rfi-enable-gpios:
type: phandle-array
required: false