Device migrations, new drivers, cleanup (#567)

* **New Features**
  * Added native display support for ST7796, ILI9341, and ST7789 panels across supported boards.
  * Added FT5x06 and FT6x36 touchscreen support.
  * Generic PWM driver
  * ESP32 PWM driver
  * Generic RGB LED driver
  * RGB PWM LED driver
  * RGB GPIO LED driver
  * Implementation of RGB LED for various boards

* **Improvements**
  * Updated board hardware descriptions to use explicit display/touch/backlight device-tree bindings and disabled deprecated HAL usage.
  * Improved display and touch-driver cleanup to prevent stale resources and improve shutdown reliability.
  * Pinned esp-hosted library to a fixed version
 
* **Deletions**
  * Obsolete placeholder display
  * Legacy ILI9488 support.
  * ESP32-specific LEDC PWM implementation

TactilityKernel/bindings/gpio-backlight.yaml

@@ -0,0 +1,16 @@
+description: >
+  Simple GPIO-driven on/off backlight, for panels whose backlight is a single digital
+  enable pin rather than a PWM-dimmable one. Brightness is treated as boolean: any
+  value greater than 0 turns the backlight on, 0 turns it off.
+
+compatible: "gpio-backlight"
+
+properties:
+  pin:
+    type: phandles
+    required: true
+    description: Backlight enable output pin
+  enabled:
+    type: boolean
+    default: false
+    description: Whether the backlight is turned on by set_brightness_default()

TactilityKernel/bindings/gpio-hog.yaml

@@ -6,7 +6,7 @@ description: >
   HAL's initBoot() hook. Declare a gpio-hog node before the dependent device(s) in the .dts
   source so it runs first.
 
-compatible: "tactility,gpio-hog"
+compatible: "gpio-hog"
 
 properties:
   pin:

TactilityKernel/bindings/pwm-backlight.yaml

@@ -0,0 +1,19 @@
+description: >
+  PWM-driven display backlight. Wraps any PWM_TYPE device (e.g. espressif,esp32-pwm-ledc or
+  pwm-generic) and maps the brightness-level-range onto its duty cycle.
+
+compatible: "pwm-backlight"
+
+properties:
+  pwm:
+    type: phandles
+    required: true
+    description: The PWM device driving the backlight
+  brightness-level-range:
+    type: values
+    default: [0, 255]
+    description: Inclusive [min,max] brightness range. The minimum value turns the backlight off.
+  brightness-default:
+    type: int
+    default: 200
+    description: Default brightness level, applied by set_brightness_default(). Should fall within brightness-level-range.

TactilityKernel/bindings/pwm.yaml

@@ -0,0 +1,20 @@
+description: >
+  Generic PWM device that tracks period, duty cycle, polarity and enabled state in memory
+  without driving real hardware. Useful as a placeholder on boards without a real PWM
+  peripheral wired up yet, or in the POSIX simulator.
+
+compatible: "pwm-generic"
+
+properties:
+  period-ns:
+    type: int
+    required: true
+    description: The PWM period, in nanoseconds
+  duty-ns:
+    type: int
+    default: 0
+    description: The PWM duty cycle (active time within one period), in nanoseconds
+  inverted:
+    type: boolean
+    default: false
+    description: Whether the output polarity is inverted

TactilityKernel/bindings/rgb-led-gpio.yaml

@@ -0,0 +1,27 @@
+description: >
+  RGB LED driven by 3 plain digital GPIO pins. Each channel is on/off only (no dimming):
+  a color component greater than 0 turns that channel's pin on.
+
+compatible: "rgb-led-gpio"
+
+properties:
+  pin-red:
+    type: phandles
+    required: true
+    description: Red channel output pin
+  pin-green:
+    type: phandles
+    required: true
+    description: Green channel output pin
+  pin-blue:
+    type: phandles
+    required: true
+    description: Blue channel output pin
+  enabled:
+    type: boolean
+    default: false
+    description: Whether the LED is turned on by default
+  default-color:
+    type: values
+    default: [255, 255, 255]
+    description: Color applied when the LED is turned on by default

TactilityKernel/bindings/rgb-led-pwm.yaml

@@ -0,0 +1,27 @@
+description: >
+  RGB LED driven by 3 PWM devices (e.g. espressif,esp32-pwm-ledc or pwm-generic),
+  one per channel, giving each channel dimming via the wrapped device's duty cycle.
+
+compatible: "rgb-led-pwm"
+
+properties:
+  pwm-red:
+    type: phandle
+    required: true
+    description: PWM device driving the red channel
+  pwm-green:
+    type: phandle
+    required: true
+    description: PWM device driving the green channel
+  pwm-blue:
+    type: phandle
+    required: true
+    description: PWM device driving the blue channel
+  enabled:
+    type: boolean
+    default: false
+    description: Whether the LED is turned on by default
+  default-color:
+    type: values
+    default: [255, 255, 255]
+    description: Color applied when the LED is turned on by default

TactilityKernel/bindings/spi-peripheral.yaml

@@ -1,5 +0,0 @@
-description: SPI peripheral
-
-compatible: "spi-peripheral"
-
-properties: {}