Renesas SmartBond(tm) power management #61857
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zephyrbot
added
area: Clock Control
platform: Renesas SmartBond
zephyrbot
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andrzej-kaczmarek,
andyross,
nordic-krch and
teburd
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drivers/timer/smartbond_timer.c
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| #define COUNTER_SPAN BIT(24) | ||
| #define CYC_PER_TICK (sys_clock_hw_cycles_per_sec() / CONFIG_SYS_CLOCK_TICKS_PER_SEC) | ||
| #define MAX_TICKS ((COUNTER_SPAN / 2 - CYC_PER_TICK) / CYC_PER_TICK) |
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I think the max_ticks should be adjusted depending on watchdog settings, i.e. watchdog is always enabled after entering extended sleep so we need to make sure that we'll wake up before it expires
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While I tried to add this functionality I'm not sure it's needed.
If CONFIG_WDT_SMARTBOND is not set. power.c will disable watchdog after wakeup.
If watchdog is configured. Whatever task is feeding watchdog must wakeup before watchdog timer expires.
If task/work or something else is not armed to be ready before watchdog bites, even if platform is woken from sleep responsible task will not be triggered and watchdog timeout will expire anyway.
Unless I'm missing something...
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Now I see.
When watchdog is disabled it will start when PD_SYS is powered off and sleep time should not exceed this time.
Which can be RCX or RC32K based so it should be computed.
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correct, so code should be only enabled if CONFIG_PM is enabled to prevent watchdog from expiring during extended sleep period. as you said, in other case something should feed watchdog before it expires.
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@kasjer fixes look good, please squash them with appropriate commits |
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done |
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rebased without changes, maybe twister will work this time |
kasjer
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drivers/gpio/gpio_smartbond.c
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| @@ -318,12 +413,16 @@ static const struct gpio_driver_api gpio_smartbond_drv_api_funcs = { | |||
| .wkup_regs = (volatile struct gpio_smartbond_wkup_regs *) \ | |||
| DT_INST_REG_ADDR_BY_NAME(id, wkup), \ | |||
| .wkup_trig_select = id, \ | |||
| GPIO_PM_DEVICE_CFG(.ngpios, DT_PROP(DT_NODELABEL(gpio##id), ngpios)) \ | |||
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this is still wrong. You can't use nodelabels in instance-based macros. Instance 0 may be gpio1.
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gmarull
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their stale review
main concerns addressed, thanks for the continued effort
This adds timer driver for Renesas SmartBond(tm) family. It uses TIMER2 block which is in PD_TIM power domain so it can work even if ARM core is disabled, thus can work as a sleep timer. Signed-off-by: Andrzej Kaczmarek <[email protected]> Signed-off-by: Jerzy Kasenberg <[email protected]>
Platform specific init is needed once power management is introduced. Signed-off-by: Andrzej Kaczmarek <[email protected]>
This enabled extended sleep for Renesas SmartBond(tm). Extended sleep is low power mode where ARM core is powered off and can be woken up by PDC. This is default sleep mode when CONFIG_PM is enabled. Signed-off-by: Andrzej Kaczmarek <[email protected]> Signed-off-by: Jerzy Kasenberg <[email protected]>
This enables cache retainability while in sleep so there's no penalty when executing from QSPI after wakeup. Signed-off-by: Andrzej Kaczmarek <[email protected]>
This adds automatic GPIO latching before going to extended sleep and restoring state after wakeup. Mode and state for each pin is stored, then ports are latched to retain state when PD_COM is disabled during sleep. On wakeup mode and state for each pin is restored and ports are unlatched to make it work again. Signed-off-by: Andrzej Kaczmarek <[email protected]> Signed-off-by: Jerzy Kasenberg <[email protected]>
This change restore DCDC configuration after system resumes. When CONFIG_PM_DEVICE is enabled each of the four rails that support DCDC handle resume in regulator_da1469x_pm_action function. Signed-off-by: Jerzy Kasenberg <[email protected]>
Update hal_renesas to include sleep code Signed-off-by: Jerzy Kasenberg <[email protected]>
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Last force-push is just rebase to main |
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I believe this PR broke "select GPIO" |
Power management
This PR introduces power management to SmartBond(tm) family.
With all subsequent changes MCU can enter low power mode where CPU is powered down, GPIOs are latched unused power domains are powered down to reduce power consumption.
First thing needed to accomplished this is usage of TIMER2 which can run event when CPU is powered off. When this timer is used Cortex Tick timer is not needed and CPU can be powered off.
Standby mode handling added (in standby mode CPU is powered off, while RAM is preserved,
sleep.Sprovides code to that restores system state when CPU is waken up)This adds timer driver for Renesas SmartBond(tm) family.
It uses TIMER2 block which is in PD_TIM power domain so it can work even if ARM core is disabled, thus can work as a sleep timer.
GPIOs are latched before CPU is powered down and PD_COM domain is also powered off during sleep.
GPIOs functionality is restored when system wakes up. When drivers: gpio: Smartbond: Improve GPIO compatibility #61844 is merged GPIOs changes will also be able to wake platform.
DC/DC converter is can be configured to be used instead of LDO
How to test
There is no separate application to test that system actually enters standby mode.
To test it's possibly to use standard blinky example with DA1469X-DK_PRO kit that has blue LED on the mother board. LED is lit when power consumption of MCU is above certain threshold detected by OpAMPs.
When blinky sample is run without power management code. Blue LED is lit all the time.
When power management (CONFIG_PM=y) is enabled with code in this PR blinky example will enter standby mode. When standby mode is entered and normal RED LED is off power consumption drops to the level that let BLUE LED to be turned off.