Fix gpio validation for esp32 variants (#2609)

Co-authored-by: Otto Winter <otto@otto-winter.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/esp32/gpio_esp32_c3.py

@@ -0,0 +1,53 @@
+import logging
+
+from esphome.const import (
+    CONF_INPUT,
+    CONF_MODE,
+    CONF_NUMBER,
+)
+import esphome.config_validation as cv
+
+_ESP32C3_SPI_PSRAM_PINS = {
+    12: "SPIHD",
+    13: "SPIWP",
+    14: "SPICS0",
+    15: "SPICLK",
+    16: "SPID",
+    17: "SPIQ",
+}
+
+_ESP32C3_STRAPPING_PINS = {2, 8, 9}
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def esp32_c3_validate_gpio_pin(value):
+    if value < 0 or value > 21:
+        raise cv.Invalid(f"Invalid pin number: {value} (must be 0-21)")
+    if value in _ESP32C3_SPI_PSRAM_PINS:
+        raise cv.Invalid(
+            f"This pin cannot be used on ESP32-C3s and is already used by the SPI/PSRAM interface (function: {_ESP32C3_SPI_PSRAM_PINS[value]})"
+        )
+    if value in _ESP32C3_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_c3_validate_supports(value):
+    num = value[CONF_NUMBER]
+    mode = value[CONF_MODE]
+    is_input = mode[CONF_INPUT]
+
+    if num < 0 or num > 21:
+        raise cv.Invalid(f"Invalid pin number: {value} (must be 0-21)")
+
+    if is_input:
+        # All ESP32 pins support input mode
+        pass
+    return value