Support for LibreTiny platform (RTL8710, BK7231 & other modules) (#3509)

Co-authored-by: Kuba Szczodrzyński <kuba@szczodrzynski.pl>
Co-authored-by: Sam Neirinck <git@samneirinck.com>
Co-authored-by: David Buezas <dbuezas@users.noreply.github.com>
Co-authored-by: Stroe Andrei Catalin <catalin2402@gmail.com>
Co-authored-by: Sam Neirinck <github@samneirinck.be>
Co-authored-by: Péter Sárközi <xmisterhu@gmail.com>
Co-authored-by: Hajo Noerenberg <hn@users.noreply.github.com>

esphome/components/libretiny_pwm/libretiny_pwm.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/automation.h"
+#include "esphome/components/output/float_output.h"
+
+#ifdef USE_LIBRETINY
+
+namespace esphome {
+namespace libretiny_pwm {
+
+class LibreTinyPWM : public output::FloatOutput, public Component {
+ public:
+  explicit LibreTinyPWM(InternalGPIOPin *pin) : pin_(pin) {}
+
+  void set_frequency(float frequency) { this->frequency_ = frequency; }
+  /// Dynamically change frequency at runtime
+  void update_frequency(float frequency) override;
+
+  /// Setup LibreTinyPWM.
+  void setup() override;
+  void dump_config() override;
+  /// HARDWARE setup priority
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
+
+  /// Override FloatOutput's write_state.
+  void write_state(float state) override;
+
+ protected:
+  InternalGPIOPin *pin_;
+  uint8_t bit_depth_{10};
+  float frequency_{};
+  float duty_{0.0f};
+  bool initialized_ = false;
+};
+
+template<typename... Ts> class SetFrequencyAction : public Action<Ts...> {
+ public:
+  SetFrequencyAction(LibreTinyPWM *parent) : parent_(parent) {}
+  TEMPLATABLE_VALUE(float, frequency);
+
+  void play(Ts... x) {
+    float freq = this->frequency_.value(x...);
+    this->parent_->update_frequency(freq);
+  }
+
+ protected:
+  LibreTinyPWM *parent_;
+};
+
+}  // namespace libretiny_pwm
+}  // namespace esphome
+
+#endif