Initial Support for RP2040 platform (#3284)

Co-authored-by: Paulus Schoutsen <balloob@gmail.com>

esphome/components/rp2040_pwm/rp2040_pwm.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#ifdef USE_RP2040
+
+#include "esphome/components/output/float_output.h"
+#include "esphome/core/automation.h"
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+
+#include "drivers/PwmOut.h"
+
+namespace esphome {
+namespace rp2040_pwm {
+
+class RP2040PWM : public output::FloatOutput, public Component {
+ public:
+  void set_pin(InternalGPIOPin *pin) { pin_ = pin; }
+  void set_frequency(float frequency) { this->frequency_ = frequency; }
+  /// Dynamically update frequency
+  void update_frequency(float frequency) override {
+    this->set_frequency(frequency);
+    this->write_state(this->last_output_);
+  }
+
+  /// Initialize pin
+  void setup() override;
+  void dump_config() override;
+  /// HARDWARE setup_priority
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
+
+ protected:
+  void write_state(float state) override;
+
+  InternalGPIOPin *pin_;
+  mbed::PwmOut *pwm_;
+  float frequency_{1000.0};
+  /// Cache last output level for dynamic frequency updating
+  float last_output_{0.0};
+};
+
+template<typename... Ts> class SetFrequencyAction : public Action<Ts...> {
+ public:
+  SetFrequencyAction(RP2040PWM *parent) : parent_(parent) {}
+  TEMPLATABLE_VALUE(float, frequency);
+
+  void play(Ts... x) {
+    float freq = this->frequency_.value(x...);
+    this->parent_->update_frequency(freq);
+  }
+
+  RP2040PWM *parent_;
+};
+
+}  // namespace rp2040_pwm
+}  // namespace esphome
+
+#endif  // USE_RP2040