Docs: Add C3 support to build_docs

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

@@ -51,7 +51,9 @@ Then it is possible to read ADC conversion result with :cpp:func:`adc1_get_raw`
 
     It is also possible to read the internal hall effect sensor via ADC1 by calling dedicated function :cpp:func:`hall_sensor_read`. Note that even the hall sensor is internal to ESP32, reading from it uses channels 0 and 3 of ADC1 (GPIO 36 and 39). Do not connect anything else to these pins and do not change their configuration. Otherwise it may affect the measurement of low value signal from the sensor.
 
-This API provides convenient way to configure ADC1 for reading from :doc:`ULP <../../api-guides/ulp>`. To do so, call function :cpp:func:`adc1_ulp_enable` and then set precision and attenuation as discussed above.
+.. only:: SOC_ULP_SUPPORTED
+
+    This API provides convenient way to configure ADC1 for reading from :doc:`ULP <../../api-guides/ulp>`. To do so, call function :cpp:func:`adc1_ulp_enable` and then set precision and attenuation as discussed above.
 
 There is another specific function :cpp:func:`adc_vref_to_gpio` used to route internal reference voltage to a GPIO pin. It comes handy to calibrate ADC reading and this is discussed in section :ref:`adc-api-adc-calibration`.
 

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

@@ -19,7 +19,15 @@ Overview
     - GPIO46 is fixed to pull-down and is input only
 
 
-There is also separate "RTC GPIO" support, which functions when GPIOs are routed to the "RTC" low-power and analog subsystem. These pin functions can be used when in deep sleep, when the :doc:`Ultra Low Power co-processor <../../api-guides/ulp>` is running, or when analog functions such as ADC/DAC/etc are in use.
+.. only:: SOC_RTCIO_INPUT_OUTPUT_SUPPORTED
+
+    There is also separate "RTC GPIO" support, which functions when GPIOs are routed to the "RTC" low-power and analog subsystem. These pin functions can be used when:
+
+    .. list::
+
+        - In deep sleep
+        :SOC_ULP_SUPPORTED: - The :doc:`Ultra Low Power co-processor <../../api-guides/ulp>` is running
+        - Analog functions such as ADC/DAC/etc are in use.
 
 Application Example
 -------------------
@@ -32,10 +40,13 @@ API Reference - Normal GPIO
 .. include-build-file:: inc/gpio.inc
 .. include-build-file:: inc/gpio_types.inc
 
-API Reference - RTC GPIO
-------------------------
 
-.. include-build-file:: inc/rtc_io.inc
-.. include-build-file:: inc/rtc_io_types.inc
+.. only:: SOC_RTCIO_INPUT_OUTPUT_SUPPORTED
+
+    API Reference - RTC GPIO
+    ------------------------
+
+    .. include-build-file:: inc/rtc_io.inc
+    .. include-build-file:: inc/rtc_io_types.inc
 
 

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

@@ -8,7 +8,7 @@ Peripherals API
 
 
     ADC <adc>
-    DAC <dac>
+    :SOC_DAC_PERIPH_NUM: DAC <dac>
     GPIO (including RTC low power I/O) <gpio>
     :SOC_DEDICATED_GPIO_SUPPORTED: Dedicated GPIO <dedic_gpio>
     :esp32s2: HMAC <hmac>
@@ -17,7 +17,7 @@ Peripherals API
     I2S <i2s>
     LED Control <ledc>
     :SOC_MCPWM_SUPPORTED: MCPWM <mcpwm>
-    Pulse Counter <pcnt>
+    :SOC_PCNT_SUPPORTED: Pulse Counter <pcnt>
     Remote Control <rmt>
     :esp32: SD Pull-up Requirements <sd_pullup_requirements>
     :SOC_SDMMC_HOST_SUPPORTED: SDMMC Host <sdmmc_host>
@@ -30,7 +30,7 @@ Peripherals API
     :esp32s2: SPI Slave Half Duplex <spi_slave_hd>
     :esp32s2: Temp sensor <temp_sensor>
     Timer <timer>
-    Touch Sensor <touch_pad>
+    :SOC_TOUCH_SENSOR_NUM: Touch Sensor <touch_pad>
     TWAI <twai>
     UART <uart>
     :SOC_USB_SUPPORTED: USB <usb>