linux-kernel - [RFC PATCH 68/77] libfdt: Introduce fdt_getprop_by_offset

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Message-ID: <20260112142009.1006236-69-herve.codina@bootlin.com>
Date: Mon, 12 Jan 2026 15:19:58 +0100
From: Herve Codina <herve.codina@...tlin.com>
To: David Gibson <david@...son.dropbear.id.au>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: Ayush Singh <ayush@...gleboard.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	devicetree-compiler@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	devicetree-spec@...r.kernel.org,
	Hui Pu <hui.pu@...ealthcare.com>,
	Ian Ray <ian.ray@...ealthcare.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Herve Codina <herve.codina@...tlin.com>
Subject: [RFC PATCH 68/77] libfdt: Introduce fdt_getprop_by_offset_w()

The future support for applying a addon on a base device-tree needs to
modify properties retrieved by their offset.

fdt_getprop_by_offset() already exists to get a preperty by its offset
but the property returned is read-only. A writable returned property is
needed.

Fill the lack and introduce fdt_getprop_by_offset_w(), the write enabled
variant of fdt_getprop_by_offset().

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 libfdt/libfdt.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libfdt/libfdt.h b/libfdt/libfdt.h
index 37459a6..0c654b1 100644
--- a/libfdt/libfdt.h
+++ b/libfdt/libfdt.h
@@ -858,6 +858,12 @@ static inline struct fdt_property *fdt_get_property_w(void *fdt, int nodeoffset,
 #ifndef SWIG /* This function is not useful in Python */
 const void *fdt_getprop_by_offset(const void *fdt, int offset,
 				  const char **namep, int *lenp);
+static inline void *fdt_getprop_by_offset_w(const void *fdt, int offset,
+					    const char **namep, int *lenp)
+{
+	return (void *)(uintptr_t)fdt_getprop_by_offset(fdt, offset, namep,
+							lenp);
+}
 #endif
 
 /**
-- 
2.52.0