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sleep: enrich top_domain_pd_allowed function description
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@ -1646,7 +1646,8 @@ esp_err_t esp_sleep_pd_config(esp_sleep_pd_domain_t domain, esp_sleep_pd_option_
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/**
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* The modules in the CPU and modem power domains still depend on the top power domain.
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* To be safe, the CPU and Modem power domains must also be powered off and saved when
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* the TOP is powered off.
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* the TOP is powered off. If not power down XTAL, power down TOP is meaningless, and
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* the XTAL clock control of some chips(esp32c6/esp32h2) depends on the top domain.
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*/
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#if SOC_PM_SUPPORT_TOP_PD
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static inline bool top_domain_pd_allowed(void) {
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