feat(driver_twai): new driver sleep retention support

docs/en/api-reference/peripherals/twai.rst

@@ -334,6 +334,15 @@ Power Management
 
 When power management is enabled via :ref:`CONFIG_PM_ENABLE`, the system may adjust or disable clock sources before entering sleep mode, which could cause TWAI to malfunction. To prevent this, the driver manages a power management lock internally. This lock is acquired when calling :cpp:func:`twai_node_enable`, ensuring the system does not enter sleep mode and TWAI remains functional. To allow the system to enter a low-power state, call :cpp:func:`twai_node_disable` to release the lock. During sleep, the TWAI controller will also stop functioning.
 
+.. only:: SOC_TWAI_SUPPORT_SLEEP_RETENTION
+
+    About Sleep Retention
+    ^^^^^^^^^^^^^^^^^^^^^
+
+    {IDF_TARGET_NAME} supports powering down the TWAI controller during **Light Sleep** to further reduce power consumption and automatically restore after waking up. This means the application does not need to reconfigure TWAI after **Light Sleep** wake up.
+
+    Enable the option :ref:`CONFIG_PM_POWER_DOWN_PERIPHERAL_IN_LIGHT_SLEEP`, and set :cpp:member:`twai_onchip_node_config_t::flags::sleep_allow_pd` to ``true`` when initializing the TWAI node to enable this feature. Otherwise, the TWAI controller will remain powered during **Light Sleep**. This feature helps reduce power consumption during light sleep but requires additional storage to save register configurations.
+
 Cache Safety
 ------------