Support for ESP32-C2 & ESP32-C6 (#4377)

Co-authored-by: Stijn Tintel <stijn@linux-ipv6.be>

esphome/components/esp32/gpio_esp32_c2.py

@@ -0,0 +1,37 @@
+import logging
+
+from esphome.const import CONF_INPUT, CONF_MODE, CONF_NUMBER
+
+import esphome.config_validation as cv
+
+_ESP32C2_STRAPPING_PINS = {8, 9}
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def esp32_c2_validate_gpio_pin(value):
+    if value < 0 or value > 20:
+        raise cv.Invalid(f"Invalid pin number: {value} (must be 0-20)")
+    if value in _ESP32C2_STRAPPING_PINS:
+        _LOGGER.warning(
+            "GPIO%d is a Strapping PIN and should be avoided.\n"
+            "Attaching external pullup/down resistors to strapping pins can cause unexpected failures.\n"
+            "See https://esphome.io/guides/faq.html#why-am-i-getting-a-warning-about-strapping-pins",
+            value,
+        )
+
+    return value
+
+
+def esp32_c2_validate_supports(value):
+    num = value[CONF_NUMBER]
+    mode = value[CONF_MODE]
+    is_input = mode[CONF_INPUT]
+
+    if num < 0 or num > 20:
+        raise cv.Invalid(f"Invalid pin number: {value} (must be 0-20)")
+
+    if is_input:
+        # All ESP32 pins support input mode
+        pass
+    return value