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drivers: spi: stm32: add runtime PM support

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Add runtime power management suppor to the STM32 SPI driver. This allows
the driver to be suspended when not in use, and as a stop effect removes
the need to suspend/resume around each transition to stop mode.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2024-05-13 22:09:05 +02:00 • committed by Anas Nashif
commit 858e8c51f1
1 changed files with 4 additions and 1 deletions
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5
drivers/spi/spi_ll_stm32.c
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@ -20,6 +20,7 @@ LOG_MODULE_REGISTER(spi_ll_stm32);
#include <zephyr/toolchain.h> #include <zephyr/toolchain.h>
#include <zephyr/pm/policy.h> #include <zephyr/pm/policy.h>
#include <zephyr/pm/device.h> #include <zephyr/pm/device.h>
#include <zephyr/pm/device_runtime.h>
#ifdef CONFIG_SPI_STM32_DMA #ifdef CONFIG_SPI_STM32_DMA
#include <zephyr/drivers/dma/dma_stm32.h> #include <zephyr/drivers/dma/dma_stm32.h>
#include <zephyr/drivers/dma.h> #include <zephyr/drivers/dma.h>
@ -82,6 +83,7 @@ static void spi_stm32_pm_policy_state_lock_get(const struct device *dev)
if (IS_ENABLED(CONFIG_PM_S2RAM)) { if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES); pm_policy_state_lock_get(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
} }
pm_device_runtime_get(dev);
} }
} }
} }
@ -93,6 +95,7 @@ static void spi_stm32_pm_policy_state_lock_put(const struct device *dev)
if (data->pm_policy_state_on) { if (data->pm_policy_state_on) {
data->pm_policy_state_on = false; data->pm_policy_state_on = false;
pm_device_runtime_put(dev);
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES); pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_IDLE, PM_ALL_SUBSTATES);
if (IS_ENABLED(CONFIG_PM_S2RAM)) { if (IS_ENABLED(CONFIG_PM_S2RAM)) {
pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES); pm_policy_state_lock_put(PM_STATE_SUSPEND_TO_RAM, PM_ALL_SUBSTATES);
@ -1224,7 +1227,7 @@ static int spi_stm32_init(const struct device *dev)
spi_context_unlock_unconditionally(&data->ctx); spi_context_unlock_unconditionally(&data->ctx);
return 0; return pm_device_runtime_enable(dev);
} }
#ifdef CONFIG_PM_DEVICE #ifdef CONFIG_PM_DEVICE