docs(esp_tinyusb): Updated CHANGELOG.md and README.md

Author: roma-jam

device/esp_tinyusb/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## [Unreleased]
 
 - Fixed forward compatibility with TinyUSB 0.19
+- Added VBUS monitoring feature for ESP32P4 USB OTG 2.0 (HS)
 
 ## 2.0.1
 

device/esp_tinyusb/README.md

@@ -245,6 +245,30 @@ If external PHY is used:
   }
 ```
 
+> **Note:** VBUS monitoring on **ESP32-P4** (USB OTG 2.0, High-speed)
+>
+> For **ESP32-S2**/**ESP32-S3**, VBUS monitoring (driving the BVALID signal) is handled in hardware.
+> For **ESP32-P4** (USB OTG 2.0), it is implemented in the driver.
+> To achieve this, an additional software timer is used in the driver. To avoid and filter glitches on the VBUS-monitor GPIO, a configurable vbus_debounce_ms parameter is available in the driver configuration.
+> Default value: 250 ms
+> If the default value isn’t enough, or if the device does not detach from the USB host port, you can increase the debounce interval:
+>
+> ```c
+>  #include "tinyusb_default_config.h"
+>  void app_main(void)
+>  {
+>    tinyusb_config_t tusb_cfg = TINYUSB_DEFAULT_CONFIG();
+>
+>    tusb_cfg.phy.self_powered     = true;
+>    tusb_cfg.phy.vbus_monitor_io  = GPIO_NUM_0;
+>#if CONFIG_IDF_TARGET_ESP32P4
+>    tusb_cfg.phy.vbus_monitor_debounce_ms = 350; // example override
+>#endif
+>    tinyusb_driver_install(&tusb_cfg);
+>  }
+>
+> ```
+
 ## USB Device Classes: usage, installation & configuration
 
 ### USB Serial Device (CDC-ACM)