michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: i2c: stm32: Support wakeup from STOP

Browse source 
This commit adds support for wakeup from STOP mode when the i2c device is
configured as a target.

Signed-off-by: Wouter Horré <wouter@versasense.com>
This commit is contained in:
Wouter Horré 2023-08-23 15:13:40 +02:00 • committed by Carles Cufí
commit 3bc531e9c6
1 changed files with 22 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

22
drivers/i2c/i2c_ll_stm32_v2.c
View file

@ -17,6 +17,8 @@
#include <stm32_ll_i2c.h>
#include <errno.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/pm/device.h>
#include <zephyr/pm/device_runtime.h>
#include "i2c_ll_stm32.h"
#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
@ -227,6 +229,16 @@ int i2c_stm32_target_register(const struct device *dev,
return ret;
}
#if defined(CONFIG_PM_DEVICE_RUNTIME)
if (pm_device_wakeup_is_capable(dev)) {
/* Mark device as active */
(void)pm_device_runtime_get(dev);
/* Enable wake-up from stop */
LOG_DBG("i2c: enabling wakeup from stop");
LL_I2C_EnableWakeUpFromStop(cfg->i2c);
}
#endif /* defined(CONFIG_PM_DEVICE_RUNTIME) */
LL_I2C_Enable(i2c);
if (!data->slave_cfg) {
@ -306,6 +318,16 @@ int i2c_stm32_target_unregister(const struct device *dev,
LL_I2C_Disable(i2c);
#if defined(CONFIG_PM_DEVICE_RUNTIME)
if (pm_device_wakeup_is_capable(dev)) {
/* Disable wake-up from STOP */
LOG_DBG("i2c: disabling wakeup from stop");
LL_I2C_DisableWakeUpFromStop(i2c);
/* Release the device */
(void)pm_device_runtime_put(dev);
}
#endif /* defined(CONFIG_PM_DEVICE_RUNTIME) */
data->slave_attached = false;
return 0;