From 714b3e3384db56b8fdd20a565d409e6a15ac7fde Mon Sep 17 00:00:00 2001
From: Gunar Schorcht <gunar@schorcht.net>
Date: Fri, 28 Apr 2023 10:43:28 +0200
Subject: [PATCH] drivers/mtd_default: add external declarations for mtd*

The `mtd_default` module defines `MTD_NUMOF` if not existing based on the `MTD_*` defines which are usually set to the corresponding MTD device pointer variables `mtd*`. However, these MTD device pointer variables are not always made known by external variable declarations. An example are SD Card Interfaces which are defined via the `mtd_sdcard_default` module. As a consequence, an application that uses `mtd_default` has still to be modified. Therefore, `mtd_default` also declares up to 6 `mtd*` MTD device pointer variables.
---
 drivers/include/mtd_default.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/include/mtd_default.h b/drivers/include/mtd_default.h
index e8190c2316..fff6376a2e 100644
--- a/drivers/include/mtd_default.h
+++ b/drivers/include/mtd_default.h
@@ -57,6 +57,31 @@ extern "C" {
 
 #endif /*  !defined(MTD_NUMOF) && !DOXYGEN */
 
+#if !DOXYGEN
+
+/**
+ * @brief   Declare `mtd*` according to the number of MTD devices
+ */
+#if MTD_NUMOF > 0
+extern mtd_dev_t *mtd0;
+#endif
+#if MTD_NUMOF > 1
+extern mtd_dev_t *mtd1;
+#endif
+#if MTD_NUMOF > 2
+extern mtd_dev_t *mtd2;
+#endif
+#if MTD_NUMOF > 3
+extern mtd_dev_t *mtd3;
+#endif
+#if MTD_NUMOF > 4
+extern mtd_dev_t *mtd4;
+#endif
+#if MTD_NUMOF > 5
+extern mtd_dev_t *mtd5;
+#endif
+#endif /* !DOXYGEN */
+
 #if defined(MODULE_MTD_SDCARD_DEFAULT)
 extern mtd_sdcard_t mtd_sdcard_dev0;
 #endif