From 04cd57d8991bcc7a1ec23175cccb2a1e5baf6baf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicolas=20M=C3=BCnnich?= <nickmunnich@gmail.com>
Date: Sun, 28 Dec 2025 22:30:42 +0000
Subject: [PATCH] feat(boards): Add ZMK specific tweaks for upstream rp2040
 board

---
 .../extensions/rp2040_zero/rp2040_zero.conf   | 16 ++++++++++++++
 .../rp2040_zero/rp2040_zero.overlay           | 22 +++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 app/boards/extensions/rp2040_zero/rp2040_zero.conf
 create mode 100644 app/boards/extensions/rp2040_zero/rp2040_zero.overlay

diff --git a/app/boards/extensions/rp2040_zero/rp2040_zero.conf b/app/boards/extensions/rp2040_zero/rp2040_zero.conf
new file mode 100644
index 000000000..147adc6d7
--- /dev/null
+++ b/app/boards/extensions/rp2040_zero/rp2040_zero.conf
@@ -0,0 +1,16 @@
+CONFIG_CONSOLE=n
+CONFIG_SERIAL=n
+CONFIG_UART_CONSOLE=n
+CONFIG_UART_INTERRUPT_DRIVEN=n
+CONFIG_ZMK_USB=y
+
+CONFIG_MPU_ALLOW_FLASH_WRITE=y
+CONFIG_NVS=y
+CONFIG_SETTINGS_NVS=y
+CONFIG_FLASH=y
+CONFIG_FLASH_PAGE_LAYOUT=y
+CONFIG_FLASH_MAP=y
+
+CONFIG_RETAINED_MEM=y
+CONFIG_RETENTION=y
+CONFIG_RETENTION_BOOT_MODE=y
\ No newline at end of file
diff --git a/app/boards/extensions/rp2040_zero/rp2040_zero.overlay b/app/boards/extensions/rp2040_zero/rp2040_zero.overlay
new file mode 100644
index 000000000..b040a9183
--- /dev/null
+++ b/app/boards/extensions/rp2040_zero/rp2040_zero.overlay
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <arm/raspberrypi/rp2040-boot-mode-retention.dtsi>
+
+&uart0 { status = "disabled"; };
+
+&code_partition {
+    reg = <0x100 (DT_SIZE_M(2) - 0x100 - DT_SIZE_K(512))>;
+};
+
+&flash0 {
+    partitions {
+        storage_partition: partition@180000 {
+            reg = <0x180000 DT_SIZE_K(512)>;
+            read-only;
+        };
+    };
+};
\ No newline at end of file