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dts: bindings: lpadc: Add regulator phandle prop

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Add phandle prop to reference any regulator that must
be enabled in order for the LPADC to function as intended.

Change LPADC driver to use this property if present.

LPADC on LPC55S36 depends on VREF peripheral, enable for this platform.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
This commit is contained in:
Declan Snyder 2023-04-12 20:21:10 +00:00 committed by Carles Cufí
parent 15bc6a2389
commit fe8b112efd
4 changed files with 30 additions and 1 deletions
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1
drivers/adc/Kconfig.mcux
View file

@ -30,6 +30,7 @@ config ADC_MCUX_LPADC
bool "MCUX LPADC driver"
default y
select ADC_CONFIGURABLE_INPUTS
select REGULATOR
depends on DT_HAS_NXP_LPC_LPADC_ENABLED
help
Enable the MCUX LPADC driver.

25
drivers/adc/adc_mcux_lpadc.c
View file

@ -13,7 +13,9 @@
#include <errno.h>
#include <zephyr/drivers/adc.h>
#include <zephyr/sys/util.h>
#include <fsl_lpadc.h>
#include <zephyr/drivers/regulator.h>
#include <zephyr/drivers/pinctrl.h>
@ -43,6 +45,7 @@ struct mcux_lpadc_config {
uint32_t offset_b;
void (*irq_config_func)(const struct device *dev);
const struct pinctrl_dev_config *pincfg;
const struct device **ref_supplies;
};
struct mcux_lpadc_data {
@ -392,6 +395,16 @@ static int mcux_lpadc_init(const struct device *dev)
return err;
}
/* Enable necessary regulators */
const struct device **regulator = config->ref_supplies;
while (*regulator != NULL) {
err = regulator_enable(*(regulator++));
if (err) {
return err;
}
}
LPADC_GetDefaultConfig(&adc_config);
adc_config.enableAnalogPreliminary = true;
@ -455,8 +468,18 @@ static const struct adc_driver_api mcux_lpadc_driver_api = {
#endif
};
#define LPADC_REGULATOR_DEPENDENCY(node_id, prop, idx) \
DEVICE_DT_GET(DT_PHANDLE_BY_IDX(node_id, prop, idx)),
#define LPADC_REGULATORS_DEFINE(inst) \
static const struct device *mcux_lpadc_ref_supplies_##inst[] = { \
COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, nxp_reference_supply), \
(DT_INST_FOREACH_PROP_ELEM(inst, nxp_reference_supply, \
LPADC_REGULATOR_DEPENDENCY)), ()) NULL};
#define LPADC_MCUX_INIT(n) \
LPADC_REGULATORS_DEFINE(n) \
\
static void mcux_lpadc_config_func_##n(const struct device *dev); \
\
PINCTRL_DT_INST_DEFINE(n); \
@ -469,8 +492,8 @@ static const struct adc_driver_api mcux_lpadc_driver_api = {
.offset_b = DT_INST_PROP(n, offset_value_b), \
.irq_config_func = mcux_lpadc_config_func_##n, \
.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
.ref_supplies = mcux_lpadc_ref_supplies_##n, \
}; \
\
static struct mcux_lpadc_data mcux_lpadc_data_##n = { \
ADC_CONTEXT_INIT_TIMER(mcux_lpadc_data_##n, ctx), \
ADC_CONTEXT_INIT_LOCK(mcux_lpadc_data_##n, ctx), \

1
dts/arm/nxp/nxp_lpc55S3x_common.dtsi
View file

@ -292,6 +292,7 @@
#io-channel-cells = <1>;
dmas = <&dma0 21>, <&dma0 22>;
dma-names = "adc0-dma0", "adc0-dma1";
nxp,reference-supply = <&vref0>;
};
dac0: dac@b2000 {

4
dts/bindings/adc/nxp,lpc-lpadc.yaml
View file

@ -71,6 +71,10 @@ properties:
required: true
description: Offset value B to use if CONFIG_LPADC_DO_OFFSET_CALIBRATION is false
nxp,reference-supply:
type: phandles
description: References to required regulators which must be enabled for LPADC to function
"#io-channel-cells":
const: 1