[mcp23xxx][pi4ioe5v6408] Add optional interrupt pin to eliminate polling (#15445)

esphome/components/mcp23008/mcp23008.cpp

@@ -22,9 +22,14 @@ void MCP23008::setup() {
     // enable open-drain interrupt pins, 3.3V-safe
     this->write_reg(mcp23x08_base::MCP23X08_IOCON, iocon | IOCON_ODR);
   }
+
+  this->setup_interrupt_pin_();
 }
 
-void MCP23008::dump_config() { ESP_LOGCONFIG(TAG, "MCP23008:"); }
+void MCP23008::dump_config() {
+  ESP_LOGCONFIG(TAG, "MCP23008:");
+  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
+}
 
 bool MCP23008::read_reg(uint8_t reg, uint8_t *value) {
   if (this->is_failed())

esphome/components/mcp23017/mcp23017.cpp

@@ -6,7 +6,8 @@ namespace mcp23017 {
 
 static const char *const TAG = "mcp23017";
 
-static constexpr uint8_t IOCON_ODR = 0x04;  // Open-drain output for INT pin
+static constexpr uint8_t IOCON_MIRROR = 0x40;  // Mirror INTA/INTB pins
+static constexpr uint8_t IOCON_ODR = 0x04;     // Open-drain output for INT pin
 
 void MCP23017::setup() {
   uint8_t iocon;
@@ -19,14 +20,26 @@ void MCP23017::setup() {
   this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
   this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);
 
+  uint8_t iocon_flags = 0;
   if (this->open_drain_ints_) {
-    // enable open-drain interrupt pins, 3.3V-safe
+    iocon_flags |= IOCON_ODR;
-    this->write_reg(mcp23x17_base::MCP23X17_IOCONA, iocon | IOCON_ODR);
-    this->write_reg(mcp23x17_base::MCP23X17_IOCONB, iocon | IOCON_ODR);
   }
+  if (this->interrupt_pin_ != nullptr) {
+    // Mirror INTA/INTB so either pin fires for changes on any port
+    iocon_flags |= IOCON_MIRROR;
+  }
+  if (iocon_flags != 0) {
+    this->write_reg(mcp23x17_base::MCP23X17_IOCONA, iocon | iocon_flags);
+    this->write_reg(mcp23x17_base::MCP23X17_IOCONB, iocon | iocon_flags);
+  }
+
+  this->setup_interrupt_pin_();
 }
 
-void MCP23017::dump_config() { ESP_LOGCONFIG(TAG, "MCP23017:"); }
+void MCP23017::dump_config() {
+  ESP_LOGCONFIG(TAG, "MCP23017:");
+  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
+}
 
 bool MCP23017::read_reg(uint8_t reg, uint8_t *value) {
   if (this->is_failed())

esphome/components/mcp23s08/mcp23s08.cpp

@@ -34,11 +34,14 @@ void MCP23S08::setup() {
     // enable open-drain interrupt pins, 3.3V-safe (addressed, only this chip)
     this->write_reg(mcp23x08_base::MCP23X08_IOCON, IOCON_SEQOP | IOCON_HAEN | IOCON_ODR);
   }
+
+  this->setup_interrupt_pin_();
 }
 
 void MCP23S08::dump_config() {
   ESP_LOGCONFIG(TAG, "MCP23S08:");
   LOG_PIN("  CS Pin: ", this->cs_);
+  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
 }
 
 bool MCP23S08::read_reg(uint8_t reg, uint8_t *value) {

esphome/components/mcp23s17/mcp23s17.cpp

@@ -7,9 +7,10 @@ namespace mcp23s17 {
 static const char *const TAG = "mcp23s17";
 
 // IOCON register bits
-static constexpr uint8_t IOCON_SEQOP = 0x20;  // Sequential operation mode
+static constexpr uint8_t IOCON_SEQOP = 0x20;   // Sequential operation mode
-static constexpr uint8_t IOCON_HAEN = 0x08;   // Hardware address enable
+static constexpr uint8_t IOCON_MIRROR = 0x40;  // Mirror INTA/INTB pins
-static constexpr uint8_t IOCON_ODR = 0x04;    // Open-drain output for INT pin
+static constexpr uint8_t IOCON_HAEN = 0x08;    // Hardware address enable
+static constexpr uint8_t IOCON_ODR = 0x04;     // Open-drain output for INT pin
 
 void MCP23S17::set_device_address(uint8_t device_addr) {
   if (device_addr != 0) {
@@ -37,16 +38,26 @@ void MCP23S17::setup() {
   this->read_reg(mcp23x17_base::MCP23X17_OLATA, &this->olat_a_);
   this->read_reg(mcp23x17_base::MCP23X17_OLATB, &this->olat_b_);
 
+  uint8_t iocon_flags = IOCON_SEQOP | IOCON_HAEN;
   if (this->open_drain_ints_) {
-    // enable open-drain interrupt pins, 3.3V-safe (addressed, only this chip)
+    iocon_flags |= IOCON_ODR;
-    this->write_reg(mcp23x17_base::MCP23X17_IOCONA, IOCON_SEQOP | IOCON_HAEN | IOCON_ODR);
-    this->write_reg(mcp23x17_base::MCP23X17_IOCONB, IOCON_SEQOP | IOCON_HAEN | IOCON_ODR);
   }
+  if (this->interrupt_pin_ != nullptr) {
+    // Mirror INTA/INTB so either pin fires for changes on any port
+    iocon_flags |= IOCON_MIRROR;
+  }
+  if (this->open_drain_ints_ || this->interrupt_pin_ != nullptr) {
+    this->write_reg(mcp23x17_base::MCP23X17_IOCONA, iocon_flags);
+    this->write_reg(mcp23x17_base::MCP23X17_IOCONB, iocon_flags);
+  }
+
+  this->setup_interrupt_pin_();
 }
 
 void MCP23S17::dump_config() {
   ESP_LOGCONFIG(TAG, "MCP23S17:");
   LOG_PIN("  CS Pin: ", this->cs_);
+  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
 }
 
 bool MCP23S17::read_reg(uint8_t reg, uint8_t *value) {

esphome/components/mcp23x08_base/mcp23x08_base.cpp

@@ -32,6 +32,11 @@ void MCP23X08Base::pin_mode(uint8_t pin, gpio::Flags flags) {
   } else if (flags == gpio::FLAG_OUTPUT) {
     this->update_reg(pin, false, iodir);
   }
+  // When interrupt_pin is configured, auto-enable CHANGE interrupt for input pins
+  // so the chip's INT output fires on any input state change
+  if (this->interrupt_pin_ != nullptr && (flags & gpio::FLAG_INPUT)) {
+    this->pin_interrupt_mode(pin, mcp23xxx_base::MCP23XXX_CHANGE);
+  }
 }
 
 void MCP23X08Base::pin_interrupt_mode(uint8_t pin, mcp23xxx_base::MCP23XXXInterruptMode interrupt_mode) {

esphome/components/mcp23x17_base/mcp23x17_base.cpp

@@ -44,6 +44,11 @@ void MCP23X17Base::pin_mode(uint8_t pin, gpio::Flags flags) {
   } else if (flags == gpio::FLAG_OUTPUT) {
     this->update_reg(pin, false, iodir);
   }
+  // When interrupt_pin is configured, auto-enable CHANGE interrupt for input pins
+  // so the chip's INT output fires on any input state change
+  if (this->interrupt_pin_ != nullptr && (flags & gpio::FLAG_INPUT)) {
+    this->pin_interrupt_mode(pin, mcp23xxx_base::MCP23XXX_CHANGE);
+  }
 }
 
 void MCP23X17Base::pin_interrupt_mode(uint8_t pin, mcp23xxx_base::MCP23XXXInterruptMode interrupt_mode) {

esphome/components/mcp23xxx_base/__init__.py

@@ -5,6 +5,7 @@ from esphome.const import (
     CONF_ID,
     CONF_INPUT,
     CONF_INTERRUPT,
+    CONF_INTERRUPT_PIN,
     CONF_INVERTED,
     CONF_MODE,
     CONF_NUMBER,
@@ -32,6 +33,7 @@ MCP23XXX_INTERRUPT_MODES = {
 MCP23XXX_CONFIG_SCHEMA = cv.Schema(
     {
         cv.Optional(CONF_OPEN_DRAIN_INTERRUPT, default=False): cv.boolean,
+        cv.Optional(CONF_INTERRUPT_PIN): pins.internal_gpio_input_pin_schema,
     }
 ).extend(cv.COMPONENT_SCHEMA)
 
@@ -43,6 +45,8 @@ async def register_mcp23xxx(config, num_pins):
     await cg.register_component(var, config)
     CORE.data.setdefault(CONF_MCP23XXX, {})[id.id] = num_pins
     cg.add(var.set_open_drain_ints(config[CONF_OPEN_DRAIN_INTERRUPT]))
+    if interrupt_pin := config.get(CONF_INTERRUPT_PIN):
+        cg.add(var.set_interrupt_pin(await cg.gpio_pin_expression(interrupt_pin)))
     return var
 
 

esphome/components/mcp23xxx_base/mcp23xxx_base.cpp

@@ -7,7 +7,12 @@ namespace mcp23xxx_base {
 
 template<uint8_t N> void MCP23XXXGPIOPin<N>::setup() {
   this->pin_mode(flags_);
-  this->parent_->pin_interrupt_mode(this->pin_, this->interrupt_mode_);
+  // When interrupt_pin is configured, pin_mode() already auto-enables CHANGE
+  // interrupt for input pins, so skip the explicit call if the user didn't
+  // override the default (NO_INTERRUPT)
+  if (this->interrupt_mode_ != MCP23XXX_NO_INTERRUPT || this->parent_->get_interrupt_pin() == nullptr) {
+    this->parent_->pin_interrupt_mode(this->pin_, this->interrupt_mode_);
+  }
 }
 template<uint8_t N> void MCP23XXXGPIOPin<N>::pin_mode(gpio::Flags flags) { this->parent_->pin_mode(this->pin_, flags); }
 template<uint8_t N> bool MCP23XXXGPIOPin<N>::digital_read() {

esphome/components/mcp23xxx_base/mcp23xxx_base.h

@@ -15,11 +15,31 @@ template<uint8_t N> class MCP23XXXBase : public Component, public gpio_expander:
   virtual void pin_interrupt_mode(uint8_t pin, MCP23XXXInterruptMode interrupt_mode);
 
   void set_open_drain_ints(const bool value) { this->open_drain_ints_ = value; }
+  void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
+  InternalGPIOPin *get_interrupt_pin() const { return this->interrupt_pin_; }
   float get_setup_priority() const override { return setup_priority::IO; }
 
-  void loop() override { this->reset_pin_cache_(); }
+  void loop() override {
+    this->reset_pin_cache_();
+    if (this->interrupt_pin_ != nullptr) {
+      this->disable_loop();
+    }
+  }
 
  protected:
+  // No need to clear latched interrupts before attaching the ISR — if INT is
+  // already low the ISR fires immediately, loop runs, cache invalidates, and
+  // the GPIO read clears the latch. One harmless extra read at most.
+  void setup_interrupt_pin_() {
+    if (this->interrupt_pin_ != nullptr) {
+      this->interrupt_pin_->setup();
+      this->interrupt_pin_->attach_interrupt(&MCP23XXXBase::gpio_intr, this, gpio::INTERRUPT_FALLING_EDGE);
+      this->set_invalidate_on_read_(false);
+      this->disable_loop();
+    }
+  }
+  static void IRAM_ATTR gpio_intr(MCP23XXXBase *arg) { arg->enable_loop_soon_any_context(); }
+
   // read a given register
   virtual bool read_reg(uint8_t reg, uint8_t *value) = 0;
   // write a value to a given register
@@ -28,6 +48,7 @@ template<uint8_t N> class MCP23XXXBase : public Component, public gpio_expander:
   virtual void update_reg(uint8_t pin, bool pin_value, uint8_t reg_a) = 0;
 
   bool open_drain_ints_;
+  InternalGPIOPin *interrupt_pin_{nullptr};
 };
 
 template<uint8_t N> class MCP23XXXGPIOPin : public GPIOPin {

esphome/components/pi4ioe5v6408/__init__.py

@@ -5,6 +5,7 @@ import esphome.config_validation as cv
 from esphome.const import (
     CONF_ID,
     CONF_INPUT,
+    CONF_INTERRUPT_PIN,
     CONF_INVERTED,
     CONF_MODE,
     CONF_NUMBER,
@@ -33,6 +34,7 @@ CONFIG_SCHEMA = (
         {
             cv.Required(CONF_ID): cv.declare_id(PI4IOE5V6408Component),
             cv.Optional(CONF_RESET, default=True): cv.boolean,
+            cv.Optional(CONF_INTERRUPT_PIN): pins.internal_gpio_input_pin_schema,
         }
     )
     .extend(cv.COMPONENT_SCHEMA)
@@ -46,6 +48,8 @@ async def to_code(config):
     await i2c.register_i2c_device(var, config)
 
     cg.add(var.set_reset(config[CONF_RESET]))
+    if interrupt_pin := config.get(CONF_INTERRUPT_PIN):
+        cg.add(var.set_interrupt_pin(await cg.gpio_pin_expression(interrupt_pin)))
 
 
 def validate_mode(value):

esphome/components/pi4ioe5v6408/pi4ioe5v6408.cpp

@@ -33,9 +33,21 @@ void PI4IOE5V6408Component::setup() {
       return;
     }
   }
+
+  // No need to clear latched interrupts before attaching the ISR — if INT is
+  // already low the ISR fires immediately, loop runs, cache invalidates, and
+  // the read clears the latch. One harmless extra read at most.
+  if (this->interrupt_pin_ != nullptr) {
+    this->interrupt_pin_->setup();
+    this->interrupt_pin_->attach_interrupt(&PI4IOE5V6408Component::gpio_intr, this, gpio::INTERRUPT_FALLING_EDGE);
+    this->set_invalidate_on_read_(false);
+    this->disable_loop();
+  }
 }
+void IRAM_ATTR PI4IOE5V6408Component::gpio_intr(PI4IOE5V6408Component *arg) { arg->enable_loop_soon_any_context(); }
 void PI4IOE5V6408Component::dump_config() {
   ESP_LOGCONFIG(TAG, "PI4IOE5V6408:");
+  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
   LOG_I2C_DEVICE(this)
   if (this->is_failed()) {
     ESP_LOGE(TAG, ESP_LOG_MSG_COMM_FAIL);
@@ -60,7 +72,12 @@ void PI4IOE5V6408Component::pin_mode(uint8_t pin, gpio::Flags flags) {
   this->write_gpio_modes_();
 }
 
-void PI4IOE5V6408Component::loop() { this->reset_pin_cache_(); }
+void PI4IOE5V6408Component::loop() {
+  this->reset_pin_cache_();
+  if (this->interrupt_pin_ != nullptr) {
+    this->disable_loop();
+  }
+}
 
 bool PI4IOE5V6408Component::read_gpio_outputs_() {
   if (this->is_failed())
@@ -142,6 +159,13 @@ bool PI4IOE5V6408Component::write_gpio_modes_() {
     this->status_set_warning(LOG_STR("Failed to write GPIO pull enable"));
     return false;
   }
+  // Enable interrupts for input pins when interrupt pin is configured
+  // (input pins have mode_mask_ bit cleared)
+  if (this->interrupt_pin_ != nullptr &&
+      !this->write_byte(PI4IOE5V6408_REGISTER_INTERRUPT_ENABLE_MASK, static_cast<uint8_t>(~this->mode_mask_))) {
+    this->status_set_warning(LOG_STR("Failed to write interrupt enable mask"));
+    return false;
+  }
 #if ESPHOME_LOG_LEVEL >= ESPHOME_LOG_LEVEL_VERBOSE
   ESP_LOGV(TAG,
            "Wrote GPIO config:\n"

esphome/components/pi4ioe5v6408/pi4ioe5v6408.h

@@ -22,8 +22,11 @@ class PI4IOE5V6408Component : public Component,
 
   /// Indicate if the component should reset the state during setup
   void set_reset(bool reset) { this->reset_ = reset; }
+  void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
 
  protected:
+  static void IRAM_ATTR gpio_intr(PI4IOE5V6408Component *arg);
+
   bool digital_read_hw(uint8_t pin) override;
   bool digital_read_cache(uint8_t pin) override;
   void digital_write_hw(uint8_t pin, bool value) override;
@@ -40,6 +43,7 @@ class PI4IOE5V6408Component : public Component,
   uint8_t pull_up_down_mask_{0x00};
 
   bool reset_{true};
+  InternalGPIOPin *interrupt_pin_{nullptr};
 
   bool read_gpio_modes_();
   bool write_gpio_modes_();

tests/components/mcp23008/common.yaml

@@ -1,6 +1,10 @@
 mcp23008:
-  i2c_id: i2c_bus
+  - i2c_id: i2c_bus
-  id: mcp23008_hub
+    id: mcp23008_hub
+  - i2c_id: i2c_bus
+    id: mcp23008_hub_int
+    address: 0x21
+    interrupt_pin: ${interrupt_pin}
 
 binary_sensor:
   - platform: gpio
@@ -9,6 +13,12 @@ binary_sensor:
       mcp23xxx: mcp23008_hub
       number: 0
       mode: INPUT
+  - platform: gpio
+    id: mcp23008_binary_sensor_int
+    pin:
+      mcp23xxx: mcp23008_hub_int
+      number: 0
+      mode: INPUT
 
 switch:
   - platform: gpio

tests/components/mcp23008/test.esp32-idf.yaml

@@ -1,3 +1,6 @@
+substitutions:
+  interrupt_pin: GPIO15
+
 packages:
   i2c: !include ../../test_build_components/common/i2c/esp32-idf.yaml
 

tests/components/mcp23008/test.esp8266-ard.yaml

@@ -1,3 +1,6 @@
+substitutions:
+  interrupt_pin: GPIO15
+
 packages:
   i2c: !include ../../test_build_components/common/i2c/esp8266-ard.yaml
 

tests/components/mcp23008/test.rp2040-ard.yaml

@@ -1,3 +1,6 @@
+substitutions:
+  interrupt_pin: GPIO2
+
 packages:
   i2c: !include ../../test_build_components/common/i2c/rp2040-ard.yaml
 

tests/components/mcp23017/common.yaml

@@ -1,6 +1,10 @@
 mcp23017:
-  i2c_id: i2c_bus
+  - i2c_id: i2c_bus
-  id: mcp23017_hub
+    id: mcp23017_hub
+  - i2c_id: i2c_bus
+    id: mcp23017_hub_int
+    address: 0x21
+    interrupt_pin: ${interrupt_pin}
 
 binary_sensor:
   - platform: gpio
@@ -9,6 +13,12 @@ binary_sensor:
       mcp23xxx: mcp23017_hub
       number: 0
       mode: INPUT
+  - platform: gpio
+    id: mcp23017_binary_sensor_int
+    pin:
+      mcp23xxx: mcp23017_hub_int
+      number: 0
+      mode: INPUT
 
 switch:
   - platform: gpio

tests/components/mcp23017/test.esp32-idf.yaml

@@ -1,3 +1,6 @@
+substitutions:
+  interrupt_pin: GPIO15
+
 packages:
   i2c: !include ../../test_build_components/common/i2c/esp32-idf.yaml
 

tests/components/mcp23017/test.esp8266-ard.yaml

@@ -1,3 +1,6 @@
+substitutions:
+  interrupt_pin: GPIO15
+
 packages:
   i2c: !include ../../test_build_components/common/i2c/esp8266-ard.yaml
 

tests/components/mcp23017/test.rp2040-ard.yaml

@@ -1,3 +1,6 @@
+substitutions:
+  interrupt_pin: GPIO2
+
 packages:
   i2c: !include ../../test_build_components/common/i2c/rp2040-ard.yaml
 

tests/components/mcp23s08/common.yaml

@@ -2,3 +2,4 @@ mcp23s08:
   - id: mcp23s08_hub
     cs_pin: ${cs_pin}
     deviceaddress: 0
+    interrupt_pin: ${interrupt_pin}

tests/components/mcp23s08/test.esp32-idf.yaml

@@ -1,5 +1,6 @@
 substitutions:
   cs_pin: GPIO5
+  interrupt_pin: GPIO15
 
 packages:
   spi: !include ../../test_build_components/common/spi/esp32-idf.yaml

tests/components/mcp23s08/test.esp8266-ard.yaml

@@ -1,5 +1,6 @@
 substitutions:
   cs_pin: GPIO15
+  interrupt_pin: GPIO0
 
 packages:
   spi: !include ../../test_build_components/common/spi/esp8266-ard.yaml

tests/components/mcp23s08/test.rp2040-ard.yaml

@@ -1,5 +1,6 @@
 substitutions:
   cs_pin: GPIO5
+  interrupt_pin: GPIO2
 
 packages:
   spi: !include ../../test_build_components/common/spi/rp2040-ard.yaml

tests/components/mcp23s17/common.yaml

@@ -2,3 +2,4 @@ mcp23s17:
   - id: mcp23s17_hub
     cs_pin: ${cs_pin}
     deviceaddress: 0
+    interrupt_pin: ${interrupt_pin}

tests/components/mcp23s17/test.esp32-idf.yaml

@@ -1,5 +1,6 @@
 substitutions:
   cs_pin: GPIO5
+  interrupt_pin: GPIO15
 
 packages:
   spi: !include ../../test_build_components/common/spi/esp32-idf.yaml

tests/components/mcp23s17/test.esp8266-ard.yaml

@@ -1,5 +1,6 @@
 substitutions:
   cs_pin: GPIO15
+  interrupt_pin: GPIO0
 
 packages:
   spi: !include ../../test_build_components/common/spi/esp8266-ard.yaml

tests/components/mcp23s17/test.rp2040-ard.yaml

@@ -1,5 +1,6 @@
 substitutions:
   cs_pin: GPIO5
+  interrupt_pin: GPIO2
 
 packages:
   spi: !include ../../test_build_components/common/spi/rp2040-ard.yaml

tests/components/pi4ioe5v6408/common.yaml

@@ -1,7 +1,11 @@
 pi4ioe5v6408:
-  i2c_id: i2c_bus
+  - i2c_id: i2c_bus
-  id: pi4ioe1
+    id: pi4ioe1
-  address: 0x44
+    address: 0x44
+  - i2c_id: i2c_bus
+    id: pi4ioe1_int
+    address: 0x45
+    interrupt_pin: ${interrupt_pin}
 
 switch:
   - platform: gpio
@@ -16,3 +20,8 @@ binary_sensor:
     pin:
       pi4ioe5v6408: pi4ioe1
       number: 1
+  - platform: gpio
+    id: sensor1_int
+    pin:
+      pi4ioe5v6408: pi4ioe1_int
+      number: 1

tests/components/pi4ioe5v6408/test.esp32-idf.yaml

@@ -1,6 +1,7 @@
 substitutions:
   i2c_sda: GPIO21
   i2c_scl: GPIO22
+  interrupt_pin: GPIO15
 
 packages:
   i2c: !include ../../test_build_components/common/i2c/esp32-idf.yaml

tests/components/pi4ioe5v6408/test.rp2040-ard.yaml

@@ -1,6 +1,7 @@
 substitutions:
   i2c_sda: GPIO4
   i2c_scl: GPIO5
+  interrupt_pin: GPIO2
 
 packages:
   i2c: !include ../../test_build_components/common/i2c/rp2040-ard.yaml