linux-kernel - [RFC PATCH 13/15] libfdt: Introduce fdt_ptr_offset

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Message-ID: <20260210173349.636766-14-herve.codina@bootlin.com>
Date: Tue, 10 Feb 2026 18:33:41 +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 13/15] libfdt: Introduce fdt_ptr_offset_

libfdt provides internal used helpers to convert an offset to a pointer
but nothing to do the reverse operation.

Fill this lack and introduce the fdt_ptr_offset_() internal helper to
convert a pointer to an offset.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 libfdt/libfdt_internal.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libfdt/libfdt_internal.h b/libfdt/libfdt_internal.h
index c1ae306..9fd0012 100644
--- a/libfdt/libfdt_internal.h
+++ b/libfdt/libfdt_internal.h
@@ -47,6 +47,11 @@ static inline void *fdt_offset_ptr_w_(void *fdt, int offset)
 	return (void *)(uintptr_t)fdt_offset_ptr_(fdt, offset);
 }
 
+static inline int fdt_ptr_offset_(const void *fdt, const void *ptr)
+{
+	return (const char *)ptr - (const char *)fdt_offset_ptr_(fdt, 0);
+}
+
 static inline const struct fdt_reserve_entry *fdt_mem_rsv_(const void *fdt, int n)
 {
 	const struct fdt_reserve_entry *rsv_table =
-- 
2.52.0