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samples: boards: stm32: serial_wakeup: Fix nucloe_wb55rg configuration

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On STM32WB55 series, wakeup in stop mode is not supported.
Disable this state in order to support this sample.

Add comments to other sections of the configuration.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
This commit is contained in:
Erwan Gouriou 2023-11-16 12:21:20 +01:00 • committed by Carles Cufí
commit b4fcbc4eb6
1 changed files with 18 additions and 2 deletions
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20
samples/boards/stm32/power_mgmt/serial_wakeup/boards/nucleo_wb55rg.overlay
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@ -1,19 +1,35 @@
/*
* Copyright (c) 2022 Linaro Limited
* Copyright (c) 2022 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
&clk_hsi {
status = "okay";
&cpu0{
/* USART Wakeup requires automatic HSI16 switch on in deepsleep mode
* which isn't possible in Stop Mode 2.
* Remove Stop Mode 2 from supported modes
*/
cpu-power-states = <&stop0 &stop1>;
};
&usart1 {
/* Set domain clock to HSI to allow wakeup from Stop mode */
clocks = <&rcc STM32_CLOCK_BUS_APB2 0x00004000>,
<&rcc STM32_SRC_HSI USART1_SEL(2)>;
/* Configure device as wakeup source */
wakeup-source;
/* Configure sleep pinctrl configuration which will be used when
* device is not configured as wakeup source by the application.
* This use case is only applicable in PM_DEVICE mode.
*/
pinctrl-1 = <&analog_pb6 &analog_pb7>;
pinctrl-names = "default", "sleep";
};
&clk_hsi {
/* Make sure HSI is enabled */
status = "okay";
};