Merge branch 'feature/esp32h21_gpio_support' into 'master'

feat(esp32h21): support GPIO on esp32h21

Closes IDF-11611

See merge request espressif/esp-idf!36781

docs/en/api-reference/peripherals/gpio/esp32h21.inc

@@ -9,10 +9,153 @@
 
 .. gpio-summary
 
-  To be updated
+The {IDF_TARGET_NAME} chip features 26 physical GPIO pins (GPIO0 ~ GPIO25). Each pin can be used as a general-purpose I/O, or to be connected to an internal peripheral signal. Through GPIO matrix and IO MUX, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
+
+The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
+
+.. list-table::
+    :header-rows: 1
+    :widths: 8 12 12 20
+
+    * - GPIO
+      - Analog Function
+      - LP GPIO
+      - Comments
+
+    * - GPIO0
+      -
+      -
+      -
+
+    * - GPIO1
+      - ADC1_CH0
+      -
+      -
+
+    * - GPIO2
+      - ADC1_CH1
+      -
+      -
+
+    * - GPIO3
+      - ADC1_CH2
+      -
+      -
+
+    * - GPIO4
+      - ADC1_CH3
+      -
+      -
+
+    * - GPIO5
+      - ADC1_CH4
+      - LP_GPIO0
+      -
+
+    * - GPIO6
+      -
+      - LP_GPIO1
+      -
+
+    * - GPIO7
+      -
+      - LP_GPIO2
+      -
+
+    * - GPIO8
+      -
+      - LP_GPIO3
+      - Strapping pin
+
+    * - GPIO9
+      -
+      - LP_GPIO4
+      -
+
+    * - GPIO10
+      -
+      - LP_GPIO5
+      -
+
+    * - GPIO11
+      -
+      - LP_GPIO6
+      -
+
+    * - GPIO12
+      -
+      -
+      -
+
+    * - GPIO13
+      -
+      -
+      - Strapping pin
+
+    * - GPIO14
+      -
+      -
+      - Strapping pin
+
+    * - GPIO15
+      -
+      -
+      -
+
+    * - GPIO16
+      -
+      -
+      -
+
+    * - GPIO17
+      -
+      -
+      - USB-JTAG
+
+    * - GPIO18
+      -
+      -
+      - USB-JTAG
+
+    * - GPIO19
+      -
+      -
+      - SPI0/1
+
+    * - GPIO20
+      -
+      -
+      - SPI0/1
+
+    * - GPIO21
+      -
+      -
+      - SPI0/1
+
+    * - GPIO22
+      -
+      -
+      - SPI0/1
+
+    * - GPIO23
+      -
+      -
+      - SPI0/1
+
+    * - GPIO24
+      -
+      -
+      - SPI0/1
+
+    * - GPIO25
+      -
+      -
+      - SPI0/1
 
 .. note::
 
-  To be updated
+    - Strapping pin: GPIO8, GPIO13, and GPIO14 are strapping pins. For more information, please refer to `datasheet <{IDF_TARGET_DATASHEET_EN_URL}>`__.
+	  - SPI0/1: GPIO19 ~ GPIO25 are usually used for SPI flash and not recommended for other uses.
+	  - USB-JTAG: GPIO17 and GPIO18 are used by USB-JTAG by default. If they are reconfigured to operate as normal GPIOs, USB-JTAG functionality will be disabled.
 
 ---