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drivers: lora: sx1276: support TCXO power control

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Add support for TCXO power control using GPIO pin. Some boards
(including B-L072Z-LRWAN1 already supported in Zephyr) need delay
applied after powering on TCXO, so add device-tree property allowing to
configure that as well. Cache information about TCXO power status, so
subsequent requests to enable it will not result in unnecessary delays.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
This commit is contained in:
Marcin Niestroj 2020-04-08 01:24:35 +02:00 • committed by Carles Cufí
commit 35328cc537
2 changed files with 60 additions and 1 deletions
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49
drivers/lora/sx1276.c
View file

@ -39,6 +39,16 @@ LOG_MODULE_REGISTER(sx1276);
#define GPIO_PA_BOOST_ENABLE_FLAGS \
DT_INST_GPIO_FLAGS(0, pa_boost_enable_gpios)
#define GPIO_TCXO_POWER_PIN DT_INST_GPIO_PIN(0, tcxo_power_gpios)
#define GPIO_TCXO_POWER_FLAGS DT_INST_GPIO_FLAGS(0, tcxo_power_gpios)
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_startup_delay_ms)
#define TCXO_POWER_STARTUP_DELAY_MS \
DT_INST_PROP(0, tcxo_power_startup_delay_ms)
#else
#define TCXO_POWER_STARTUP_DELAY_MS 0
#endif
/*
* Those macros must be in sync with 'power-amplifier-output' dts property.
*/
@ -105,6 +115,10 @@ static struct sx1276_data {
#if DT_INST_NODE_HAS_PROP(0, rfo_enable_gpios) && \
DT_INST_NODE_HAS_PROP(0, pa_boost_enable_gpios)
uint8_t tx_power;
#endif
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
struct device *tcxo_power;
bool tcxo_power_enabled;
#endif
struct device *spi;
struct spi_config spi_cfg;
@ -165,7 +179,25 @@ void SX1276SetAntSwLowPower(bool low_power)
void SX1276SetBoardTcxo(uint8_t state)
{
/* TODO */
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
bool enable = state;
if (enable == dev_data.tcxo_power_enabled) {
return;
}
if (enable) {
gpio_pin_set(dev_data.tcxo_power, GPIO_TCXO_POWER_PIN, 1);
if (TCXO_POWER_STARTUP_DELAY_MS > 0) {
k_sleep(K_MSEC(TCXO_POWER_STARTUP_DELAY_MS));
}
} else {
gpio_pin_set(dev_data.tcxo_power, GPIO_TCXO_POWER_PIN, 0);
}
dev_data.tcxo_power_enabled = enable;
#endif
}
void SX1276SetAntSw(uint8_t opMode)
@ -192,6 +224,8 @@ void SX1276SetAntSw(uint8_t opMode)
void SX1276Reset(void)
{
SX1276SetBoardTcxo(true);
gpio_pin_configure(dev_data.reset, GPIO_RESET_PIN,
GPIO_OUTPUT_ACTIVE | GPIO_RESET_FLAGS);
@ -485,6 +519,19 @@ static int sx1276_lora_init(struct device *dev)
dev_data.spi_cfg.cs = &spi_cs;
#endif
#if DT_INST_NODE_HAS_PROP(0, tcxo_power_gpios)
dev_data.tcxo_power = device_get_binding(
DT_INST_GPIO_LABEL(0, tcxo_power_gpios));
if (!dev_data.tcxo_power) {
LOG_ERR("Cannot get pointer to %s device",
DT_INST_GPIO_LABEL(0, tcxo_power_gpios));
return -EIO;
}
gpio_pin_configure(dev_data.tcxo_power, GPIO_TCXO_POWER_PIN,
GPIO_OUTPUT_INACTIVE | GPIO_TCXO_POWER_FLAGS);
#endif
/* Setup Reset gpio */
dev_data.reset = device_get_binding(
DT_INST_GPIO_LABEL(0, reset_gpios));

12
dts/bindings/lora/semtech,sx1276.yaml
View file

@ -54,3 +54,15 @@ properties:
required: false
description: |
PA_BOOST antenna output enable pin.
tcxo-power-gpios:
type: phandle-array
required: false
description: |
TCXO power enable pin.
tcxo-power-startup-delay-ms:
type: int
required: false
description: |
Delay which has to be applied after enabling TCXO power.