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drivers: adc: stm32: get prescaler value from dts

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Get the STM32 ADC prescaler data from dts to create the appropriate LL
macro to use for the ADC clock.

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
This commit is contained in:
Guillaume Gautier 2023-06-23 16:34:50 +02:00 • committed by Fabio Baltieri
commit e8c4990639
1 changed files with 25 additions and 0 deletions
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25
drivers/adc/adc_stm32.c
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@ -160,6 +160,7 @@ struct adc_stm32_cfg {
ADC_TypeDef *base;
void (*irq_cfg_func)(void);
struct stm32_pclken pclken;
uint32_t clk_prescaler;
const struct pinctrl_dev_config *pcfg;
const uint16_t sampling_time_table[STM32_NB_SAMPLING_TIME];
int8_t num_sampling_time_common_channels;
@ -1388,6 +1389,29 @@ static const struct adc_driver_api api_stm32_driver_api = {
.ref_internal = STM32_ADC_VREF_MV, /* VREF is usually connected to VDD */
};
#if defined(CONFIG_SOC_SERIES_STM32F0X)
/* LL_ADC_CLOCK_ASYNC_DIV1 doesn't exist in F0 LL. Define it here. */
#define LL_ADC_CLOCK_ASYNC_DIV1 LL_ADC_CLOCK_ASYNC
#endif
/* st_prescaler property requires 2 elements : clock ASYNC/SYNC and DIV */
#define ADC_STM32_CLOCK(x) DT_INST_PROP(x, st_adc_clock_source)
#define ADC_STM32_DIV(x) DT_INST_PROP(x, st_adc_prescaler)
/* Macro to set the prefix depending on the 1st element: check if it is SYNC or ASYNC */
#define ADC_STM32_CLOCK_PREFIX(x) \
COND_CODE_1(IS_EQ(ADC_STM32_CLOCK(x), SYNC), \
(LL_ADC_CLOCK_SYNC_PCLK_DIV), \
(LL_ADC_CLOCK_ASYNC_DIV))
/* Concat prefix (1st element) and DIV value (2nd element) of st,adc-prescaler */
#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32f1_adc)
#define ADC_STM32_DT_PRESC(x) 0
#else
#define ADC_STM32_DT_PRESC(x) \
_CONCAT(ADC_STM32_CLOCK_PREFIX(x), ADC_STM32_DIV(x))
#endif
#ifdef CONFIG_ADC_STM32_SHARED_IRQS
bool adc_stm32_is_irq_active(ADC_TypeDef *adc)
@ -1500,6 +1524,7 @@ static const struct adc_stm32_cfg adc_stm32_cfg_##index = { \
.enr = DT_INST_CLOCKS_CELL(index, bits), \
.bus = DT_INST_CLOCKS_CELL(index, bus), \
}, \
.clk_prescaler = ADC_STM32_DT_PRESC(index), \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(index), \
.temp_channel = DT_INST_PROP_OR(index, temp_channel, 0xFF), \
.vref_channel = DT_INST_PROP_OR(index, vref_channel, 0xFF), \