docs: updates the dac part on ESP32S2.

Closes https://github.com/espressif/esp-idf/issues/6333

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

@@ -13,7 +13,14 @@ Overview
 
 The DAC driver allows these channels to be set to arbitrary voltages.
 
-The DAC channels can also be driven with DMA-style written sample data, via the :doc:`I2S driver <i2s>` when using the "built-in DAC mode".
+.. only:: esp32
+
+    The DAC channels can also be driven with DMA-style written sample data by the digital controller, via the :doc:`I2S driver <i2s>` when using the "built-in DAC mode".
+
+.. only:: esp32s2
+
+    The DAC channels can also be driven with DMA-style written sample data by the digital controller, however the driver does not supported this yet.
+
 
 For other analog output options, see the :doc:`Sigma-delta Modulation module <sigmadelta>` and the :doc:`LED Control module <ledc>`. Both these modules produce high frequency PWM output, which can be hardware low-pass filtered in order to generate a lower frequency analog output.