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/uart/uart_component_libretiny.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#ifdef USE_LIBRETINY
+
+#include <vector>
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/log.h"
+#include "uart_component.h"
+
+namespace esphome {
+namespace uart {
+
+class LibreTinyUARTComponent : public UARTComponent, public Component {
+ public:
+  void setup() override;
+  void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::BUS; }
+
+  void write_array(const uint8_t *data, size_t len) override;
+
+  bool peek_byte(uint8_t *data) override;
+  bool read_array(uint8_t *data, size_t len) override;
+
+  int available() override;
+  void flush() override;
+
+  uint16_t get_config();
+
+  HardwareSerial *get_hw_serial() { return this->serial_; }
+  int8_t get_hw_serial_number() { return this->hardware_idx_; }
+
+ protected:
+  void check_logger_conflict() override;
+
+  HardwareSerial *serial_{nullptr};
+  int8_t hardware_idx_{-1};
+};
+
+}  // namespace uart
+}  // namespace esphome
+
+#endif  // USE_LIBRETINY