From f021af714d09b1ecf9e269cf555aaba38108a270 Mon Sep 17 00:00:00 2001
From: raiden00pl <raiden00@railab.me>
Date: Sat, 11 Jul 2026 20:46:16 +0200
Subject: [PATCH] drivers/ioexpander/sx1509: include nuttx/arch.h for up_mdelay

up_mdelay() is used in the reset sequence but nuttx/arch.h was not
included, causing an implicit-declaration build error.

Signed-off-by: raiden00pl <raiden00@railab.me>
---
 drivers/ioexpander/sx1509.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ioexpander/sx1509.c b/drivers/ioexpander/sx1509.c
index e2824c489c3..c1ed2dac606 100644
--- a/drivers/ioexpander/sx1509.c
+++ b/drivers/ioexpander/sx1509.c
@@ -31,6 +31,7 @@
 #include <errno.h>
 #include <nuttx/debug.h>
 
+#include <nuttx/arch.h>
 #include <nuttx/nuttx.h>
 #include <nuttx/irq.h>
 #include <nuttx/i2c/i2c_master.h>
@@ -886,6 +887,7 @@ static void sx1509_irqworker(void *arg)
               /* Did any of the requested pin interrupts occur? */
 
               ioe_pinset_t match = pinset & priv->cb[i].pinset;
+
               if (match != 0)
                 {
                   /* Yes.. perform the callback */