From 237d87880fe4709e00c2ca76182fc184d8729985 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Wed, 16 Sep 2026 03:42:42 -0500
Subject: [PATCH] [pcf8574] Use a user provided default constructor for
 PCF8574GPIOPin (#19207)

---
 esphome/components/pcf8574/pcf8574.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/esphome/components/pcf8574/pcf8574.h b/esphome/components/pcf8574/pcf8574.h
index e8f78bae506..9879d6a47eb 100644
--- a/esphome/components/pcf8574/pcf8574.h
+++ b/esphome/components/pcf8574/pcf8574.h
@@ -51,6 +51,9 @@ class PCF8574Component final : public Component,
 /// Helper class to expose a PCF8574 pin as an internal input GPIO pin.
 class PCF8574GPIOPin final : public GPIOPin {
  public:
+  // User provided, not "= default": `new(p) PCF8574GPIOPin()` would zero-fill .bss that is already zero.
+  PCF8574GPIOPin() {}
+
   void setup() override;
   void pin_mode(gpio::Flags flags) override;
   bool digital_read() override;
@@ -65,10 +68,10 @@ class PCF8574GPIOPin final : public GPIOPin {
   gpio::Flags get_flags() const override { return this->flags_; }
 
  protected:
-  PCF8574Component *parent_;
-  uint8_t pin_;
-  bool inverted_;
-  gpio::Flags flags_;
+  PCF8574Component *parent_{nullptr};
+  uint8_t pin_{0};
+  bool inverted_{false};
+  gpio::Flags flags_{};
 };
 
 }  // namespace esphome::pcf8574