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soc: stm32: PM: Disable jtag port pins if no debug

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At chip startup, jtag pins are configured by default to enable
debug.
This configuration adds consumption and when using PM profile,
we can save ~40uA by resetting this configuration and setting pins
to analog mode.

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>
This commit is contained in:
Erwan Gouriou 2023-09-27 17:58:43 +02:00 • committed by Fabio Baltieri
commit 3d0c391ff2
4 changed files with 57 additions and 0 deletions
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5
dts/bindings/gpio/swj-connector.yaml Normal file
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@ -0,0 +1,5 @@
description: Serial Wire - JTAG Connector
compatible: "swj-connector"
include: pinctrl-device.yaml

4
soc/arm/st_stm32/common/CMakeLists.txt
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@ -8,3 +8,7 @@ zephyr_sources_ifdef(CONFIG_STM32_BACKUP_SRAM stm32_backup_sram.c)
zephyr_linker_sources_ifdef(CONFIG_STM32_BACKUP_SRAM SECTIONS stm32_backup_sram.ld)
zephyr_sources(soc_config.c)
if (NOT CONFIG_DEBUG AND CONFIG_PM)
zephyr_sources_ifdef(CONFIG_DT_HAS_SWJ_CONNECTOR_ENABLED pm_debug_swj.c)
endif()

8
soc/arm/st_stm32/common/Kconfig.soc
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@ -21,6 +21,14 @@ config USE_STM32_ASSERT
help
Enable asserts in STM32Cube HAL and LL drivers.
config SWJ_ANALOG_PRIORITY
int "SWJ DP port to analog routine initialization priority"
default 49
help
Initialization priority of the routine within the PRE_KERNEL1 level.
This priority must be greater than GPIO_INIT_PRIORITY and lower than
UART_INIT_PRIORITY.
choice POWER_SUPPLY_CHOICE
prompt "STM32 power supply configuration"
default POWER_SUPPLY_LDO

40
soc/arm/st_stm32/common/pm_debug_swj.c Normal file
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@ -0,0 +1,40 @@
/*
* Copyright (c) 2023 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/init.h>
#define SWJ_NODE DT_NODELABEL(swj_port)
PINCTRL_DT_DEFINE(SWJ_NODE);
const struct pinctrl_dev_config *swj_pcfg = PINCTRL_DT_DEV_CONFIG_GET(SWJ_NODE);
/*
* Serial Wire / JTAG port pins are enabled as part of SoC default configuration.
* When debug access is not needed and in case power consumption performance is
* expected, configure matching pins to analog in order to save power.
*/
static int swj_to_analog(void)
{
int err;
/* Set Serial Wire / JTAG port pins to analog mode */
err = pinctrl_apply_state(swj_pcfg, PINCTRL_STATE_SLEEP);
if (err < 0) {
__ASSERT(0, "SWJ pinctrl setup failed");
return err;
}
return 0;
}
/* Run this routine as the earliest pin configuration in the target,
* to avoid potential conflicts with devices accessing SWJ-DG pins for
* their own needs.
*/
SYS_INIT(swj_to_analog, PRE_KERNEL_1, CONFIG_SWJ_ANALOG_PRIORITY);