[mipi_spi] Add generic SPD2010 model and SenseCAP Watcher board

Split the SPD2010 panel settings into a generic SPD2010 model so boards
using the panel only set their own pins. The Waveshare board keeps its
expander reset, and the Seeed SenseCAP Watcher uses CS on GPIO45 with a
software reset.

esphome/components/mipi_spi/models/spd2010.py

@@ -8,21 +8,18 @@ from esphome.components.spi import TYPE_QUAD
 from esphome.const import CONF_MIRROR_X, CONF_MIRROR_Y
 
 # fmt: off
-DriverChip(
-    "WAVESHARE-ESP32-S3-TOUCH-LCD-1.46",
+SPD2010 = DriverChip(
+    "SPD2010",
     width=412,
     height=412,
     bus_mode=TYPE_QUAD,
     spi_mode="MODE0",
     data_rate="40MHz",
-    cs_pin=21,
-    reset_pin={"pca9554": None, "number": 1},
     color_order=MODE_RGB,
     draw_rounding=4,
     transforms={CONF_MIRROR_X, CONF_MIRROR_Y},
     use_axis_flips=True,
     reset_delay=20,
-    requires={"pca9554"},
     initsequence=(
         delay(100),
         (0xFF, 0x20, 0x10, 0x10),
@@ -416,3 +413,16 @@ DriverChip(
     ),
 )
 # fmt: on
+
+SPD2010.extend(
+    "WAVESHARE-ESP32-S3-TOUCH-LCD-1.46",
+    cs_pin=21,
+    reset_pin={"pca9554": None, "number": 1},
+    requires={"pca9554"},
+)
+
+# The panel reset is wired to the chip reset, so only the software reset is available.
+SPD2010.extend(
+    "SEEED-SENSECAP-WATCHER",
+    cs_pin={"number": 45, "ignore_strapping_warning": True},
+)

tests/component_tests/mipi_spi/fixtures/spd2010_sensecap_watcher.yaml

@@ -0,0 +1,16 @@
+esphome:
+  name: sensecap-watcher
+
+esp32:
+  variant: esp32s3
+  framework:
+    type: esp-idf
+
+spi:
+  type: quad
+  clk_pin: 7
+  data_pins: [9, 1, 14, 13]
+
+display:
+  - platform: mipi_spi
+    model: SEEED-SENSECAP-WATCHER

tests/component_tests/mipi_spi/test_init.py

@@ -414,6 +414,23 @@ def test_spd2010_expander_default_generation(
     assert "mipi_spi_mipispi_id->set_reset_pin(pca9554_pca9554gpiopin_id);" in main_cpp
 
 
+def test_sensecap_watcher_generation(
+    generate_main: Callable[[str | Path], str],
+    component_fixture_path: Callable[[str], Path],
+) -> None:
+    """The Watcher model needs no expander, sets CS 45 and resets by software."""
+    main_cpp = generate_main(component_fixture_path("spd2010_sensecap_watcher.yaml"))
+
+    assert "pca9554" not in main_cpp
+    assert "set_reset_pin" not in main_cpp
+    assert "set_pin(::GPIO_NUM_45);" in main_cpp
+    assert (
+        "mipi_spi_mipispi_id->set_cs_pin(esp32_esp32internalgpiopin_id_2);" in main_cpp
+    )
+    # SWRESET ({1, 0}) is prepended because there is no reset pin.
+    assert _init_sequence(main_cpp).startswith("{1, 0, 20, 255,")
+
+
 def test_spd2010_default_reset_requires_expander() -> None:
     """A registered pin schema alone cannot satisfy the default expander reference."""
     result = validate_config(