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drivers: display: stm32_ltdc: add support of clock_configure

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Add support of clock_configure() for clock source selection
through devicetree.

Signed-off-by: Hugues Fruchet <hugues.fruchet@foss.st.com>
This commit is contained in:
Hugues Fruchet 2025-04-01 15:05:55 +02:00 • committed by Benjamin Cabé
commit 873bba0a1b
1 changed files with 28 additions and 7 deletions
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35
drivers/display/display_stm32_ltdc.c
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@ -76,7 +76,8 @@ struct display_stm32_ltdc_config {
uint32_t height;
struct gpio_dt_spec disp_on_gpio;
struct gpio_dt_spec bl_ctrl_gpio;
struct stm32_pclken pclken;
const struct stm32_pclken *pclken;
size_t pclk_len;
const struct reset_dt_spec reset;
const struct pinctrl_dev_config *pctrl;
void (*irq_config_func)(const struct device *dev);
@ -297,6 +298,14 @@ static int stm32_ltdc_display_blanking_on(const struct device *dev)
return display_blanking_on(display_dev);
}
/* This symbol takes the value 1 if one of the device instances */
/* is configured in dts with a domain clock */
#if STM32_DT_INST_DEV_DOMAIN_CLOCK_SUPPORT
#define STM32_LTDC_DOMAIN_CLOCK_SUPPORT 1
#else
#define STM32_LTDC_DOMAIN_CLOCK_SUPPORT 0
#endif
static int stm32_ltdc_init(const struct device *dev)
{
int err;
@ -337,12 +346,23 @@ static int stm32_ltdc_init(const struct device *dev)
/* Turn on LTDC peripheral clock */
err = clock_control_on(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
(clock_control_subsys_t) &config->pclken);
(clock_control_subsys_t) &config->pclken[0]);
if (err < 0) {
LOG_ERR("Could not enable LTDC peripheral clock");
return err;
}
if (IS_ENABLED(STM32_LTDC_DOMAIN_CLOCK_SUPPORT) && (config->pclk_len > 1)) {
/* Enable LTDC clock source */
err = clock_control_configure(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
(clock_control_subsys_t) &config->pclken[1],
NULL);
if (err < 0) {
LOG_ERR("Could not configure LTDC peripheral clock");
return err;
}
}
#if defined(CONFIG_SOC_SERIES_STM32F4X)
LL_RCC_PLLSAI_Disable();
LL_RCC_PLLSAI_ConfigDomain_LTDC(LL_RCC_PLLSOURCE_HSE,
@ -455,7 +475,7 @@ static int stm32_ltdc_suspend(const struct device *dev)
/* Turn off LTDC peripheral clock */
err = clock_control_off(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
(clock_control_subsys_t) &config->pclken);
(clock_control_subsys_t) &config->pclken[0]);
return err;
}
@ -634,6 +654,9 @@ static DEVICE_API(display, stm32_ltdc_display_api) = {
}, \
}, \
}; \
static const struct stm32_pclken pclken_##inst[] = \
STM32_DT_INST_CLOCKS(inst); \
\
static const struct display_stm32_ltdc_config stm32_ltdc_config_##inst = { \
.width = DT_INST_PROP(inst, width), \
.height = DT_INST_PROP(inst, height), \
@ -642,10 +665,8 @@ static DEVICE_API(display, stm32_ltdc_display_api) = {
.bl_ctrl_gpio = COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, bl_ctrl_gpios), \
(GPIO_DT_SPEC_INST_GET(inst, bl_ctrl_gpios)), ({ 0 })), \
.reset = RESET_DT_SPEC_INST_GET(0), \
.pclken = { \
.enr = DT_INST_CLOCKS_CELL(inst, bits), \
.bus = DT_INST_CLOCKS_CELL(inst, bus) \
}, \
.pclken = pclken_##inst, \
.pclk_len = DT_INST_NUM_CLOCKS(inst), \
.pctrl = STM32_LTDC_DEVICE_PINCTRL_GET(inst), \
.irq_config_func = stm32_ltdc_irq_config_func_##inst, \
.display_controller = DEVICE_DT_GET_OR_NULL( \