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soc: espressif: add misssing external xtal kconfig entry

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External XTAL usage is missing a Bootstrap Cycle configuration
in Kconfig, causing build to failure when CONFIG_RTC_CLK_SRC_EXT_CRYS
is selected.

Fixes #72190

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
This commit is contained in:
Sylvio Alves 2024-05-05 17:03:11 -03:00 • committed by Anas Nashif
commit 3f07d4b6ab
4 changed files with 68 additions and 0 deletions
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17
soc/espressif/esp32/Kconfig.rtc
View file

@ -74,4 +74,21 @@ config RTC_XTAL_CAL_RETRY
Increase this option if the 32k crystal oscillator
does not start and switches to internal RC.
config ESP_SYSTEM_RTC_EXT_XTAL_BOOTSTRAP_CYCLES
int "Bootstrap cycles for external 32kHz crystal"
depends on ESP_SYSTEM_RTC_EXT_XTAL
default 5
range 0 32768
help
To reduce the startup time of an external RTC crystal,
we bootstrap it with a 32kHz square wave for a fixed number of cycles.
Setting 0 will disable bootstrapping (if disabled, the crystal may take
longer to start up or fail to oscillate under some conditions).
If this value is too high, a faulty crystal may initially start and then fail.
If this value is too low, an otherwise good crystal may not start.
To accurately determine if the crystal has started,
set a larger "Number of cycles for RTC_SLOW_CLK calibration" (about 3000).
endif # SOC_SERIES_ESP32

17
soc/espressif/esp32c3/Kconfig.rtc
View file

@ -47,4 +47,21 @@ config RTC_CLK_CAL_CYCLES
In case more value will help improve the definition of the launch of the crystal.
If the crystal could not start, it will be switched to internal RC.
config ESP_SYSTEM_RTC_EXT_XTAL_BOOTSTRAP_CYCLES
int "Bootstrap cycles for external 32kHz crystal"
depends on ESP_SYSTEM_RTC_EXT_XTAL
default 0
range 0 32768
help
To reduce the startup time of an external RTC crystal,
we bootstrap it with a 32kHz square wave for a fixed number of cycles.
Setting 0 will disable bootstrapping (if disabled, the crystal may take
longer to start up or fail to oscillate under some conditions).
If this value is too high, a faulty crystal may initially start and then fail.
If this value is too low, an otherwise good crystal may not start.
To accurately determine if the crystal has started,
set a larger "Number of cycles for RTC_SLOW_CLK calibration" (about 3000).
endif # SOC_SERIES_ESP32C3

17
soc/espressif/esp32s2/Kconfig.rtc
View file

@ -73,4 +73,21 @@ config RTC_XTAL_CAL_RETRY
Increase this option if the 32k crystal oscillator
does not start and switches to internal RC.
config ESP_SYSTEM_RTC_EXT_XTAL_BOOTSTRAP_CYCLES
int "Bootstrap cycles for external 32kHz crystal"
depends on ESP_SYSTEM_RTC_EXT_XTAL
default 0
range 0 32768
help
To reduce the startup time of an external RTC crystal,
we bootstrap it with a 32kHz square wave for a fixed number of cycles.
Setting 0 will disable bootstrapping (if disabled, the crystal may take
longer to start up or fail to oscillate under some conditions).
If this value is too high, a faulty crystal may initially start and then fail.
If this value is too low, an otherwise good crystal may not start.
To accurately determine if the crystal has started,
set a larger "Number of cycles for RTC_SLOW_CLK calibration" (about 3000).
endif # SOC_SERIES_ESP32S2

17
soc/espressif/esp32s3/Kconfig.rtc
View file

@ -43,4 +43,21 @@ config RTC_CLK_CAL_CYCLES
In case more value will help improve the definition of the launch of the crystal.
If the crystal could not start, it will be switched to internal RC.
config ESP_SYSTEM_RTC_EXT_XTAL_BOOTSTRAP_CYCLES
int "Bootstrap cycles for external 32kHz crystal"
depends on ESP_SYSTEM_RTC_EXT_XTAL
default 0
range 0 32768
help
To reduce the startup time of an external RTC crystal,
we bootstrap it with a 32kHz square wave for a fixed number of cycles.
Setting 0 will disable bootstrapping (if disabled, the crystal may take
longer to start up or fail to oscillate under some conditions).
If this value is too high, a faulty crystal may initially start and then fail.
If this value is too low, an otherwise good crystal may not start.
To accurately determine if the crystal has started,
set a larger "Number of cycles for RTC_SLOW_CLK calibration" (about 3000).
endif # SOC_SERIES_ESP32S3