[PATCH v5 3/4] u-boot: fix pylibfdt build with swig 4.5.0

[Jaipaul Cheernam <jaipaul.cheernam@est.tech>]

SWIG 4.5.0 removed Python 2 compatibility macros (PyInt_*, PyString_*)
from its runtime. Backport the dtc upstream fix to u-boot's bundled
pylibfdt/libfdt.i_shipped to replace them with Python 3 equivalents.

Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
---
 ...-removed-SWIG-Python-2-compatibility.patch | 55 +++++++++++++++++++
 meta/recipes-bsp/u-boot/u-boot-common.inc     |  4 +-
 2 files changed, 58 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch

diff --git a/meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch b/meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch
new file mode 100644
index 0000000000..c1d0204e32
--- /dev/null
+++ b/meta/recipes-bsp/u-boot/files/0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch
@@ -0,0 +1,55 @@
+From 886616d03b6afcc5ce8b34e7af91f7ccfbb0a5c Mon Sep 17 00:00:00 2001
+From: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+Date: Tue, 11 Aug 2026 13:21:01 +0000
+Subject: [PATCH] pylibfdt: Replace removed SWIG Python 2 compatibility macros
+
+SWIG 4.5.0 removed Python 2 compatibility macros (PyInt_*, PyString_*)
+from its runtime header pyhead.swg (see commit 79f7a2b7cb7d). Replace
+them with their Python 3 C API equivalents:
+
+- PyString_FromString -> PyUnicode_FromString
+- PyString_AsString -> PyBytes_AsString
+- PyInt_AsLong -> PyLong_AsLong
+
+The replacements are safe since the macros were already aliased to
+these exact functions in SWIG's Python 3 code path.
+
+This is a backport of dtc commit 5008d1d6a356 ("pylibfdt: Replace
+removed SWIG Python 2 compatibility macros").
+
+Upstream-Status: Submitted [https://patchwork.ozlabs.org/patch/2283713/]
+
+Signed-off-by: Jaipaul Cheernam <jaipaul.cheernam@est.tech>
+---
+ scripts/dtc/pylibfdt/libfdt.i_shipped | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/scripts/dtc/pylibfdt/libfdt.i_shipped b/scripts/dtc/pylibfdt/libfdt.i_shipped
+index e4659489..326a15c7 100644
+--- a/scripts/dtc/pylibfdt/libfdt.i_shipped
++++ b/scripts/dtc/pylibfdt/libfdt.i_shipped
+@@ -1033,7 +1033,7 @@ typedef uint32_t fdt32_t;
+ 	PyObject *buff;
+ 
+ 	if ($1) {
+-		resultobj = PyString_FromString(
++		resultobj = PyUnicode_FromString(
+ 			fdt_string(fdt1, fdt32_to_cpu($1->nameoff)));
+ 		buff = PyByteArray_FromStringAndSize(
+ 			(const char *)($1 + 1), fdt32_to_cpu($1->len));
+@@ -1064,13 +1064,13 @@ typedef uint32_t fdt32_t;
+         }
+         $1 = PyBytes_AsString($input);
+     %#else
+-        $1 = PyString_AsString($input);   /* char *str */
++        $1 = PyBytes_AsString($input);   /* char *str */
+     %#endif
+ }
+ 
+ /* typemaps used for fdt_next_node() */
+ %typemap(in, numinputs=1) int *depth (int depth) {
+-   depth = (int) PyInt_AsLong($input);
++   depth = (int) PyLong_AsLong($input);
+    $1 = &depth;
+ }
+ 
diff --git a/meta/recipes-bsp/u-boot/u-boot-common.inc b/meta/recipes-bsp/u-boot/u-boot-common.inc
index a1fa701e10..d82d42cbce 100644
--- a/meta/recipes-bsp/u-boot/u-boot-common.inc
+++ b/meta/recipes-bsp/u-boot/u-boot-common.inc
@@ -14,7 +14,9 @@ PE = "1"
 # repo during parse
 SRCREV = "ece349ade2973e220f524ce59e59711cc919263f"
 
-SRC_URI = "git://git.u-boot-project.org/u-boot/u-boot.git;protocol=https;branch=main;tag=v${PV}"
+SRC_URI = "git://git.u-boot-project.org/u-boot/u-boot.git;protocol=https;branch=main;tag=v${PV} \
+           file://0001-pylibfdt-Replace-removed-SWIG-Python-2-compatibility.patch \
+           "
 
 B = "${WORKDIR}/build"