linux-kernel - [RFC PATCH 09/77] dtc: Introduce mark_local

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Message-ID: <20260112142009.1006236-10-herve.codina@bootlin.com>
Date: Mon, 12 Jan 2026 15:18:59 +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 09/77] dtc: Introduce mark_local_phandles()

In order to have the new FDT_REF_LOCAL tag present in a dtb, the phandle
reference needs to be identify as a local reference.

This is the purpose of mark_local_phandles().

It identifies a phandle reference as a local reference when this
reference points to a local node.

With that node, the related FDT_REF_LOCAL tag is set in the dtb.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 dtc.c      |  1 +
 dtc.h      |  1 +
 livetree.c | 26 ++++++++++++++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/dtc.c b/dtc.c
index 88f03ff..d0b4de3 100644
--- a/dtc.c
+++ b/dtc.c
@@ -334,6 +334,7 @@ int main(int argc, char *argv[])
 	}
 
 	update_phandles_ref(dti);
+	mark_local_phandles(dti);
 
 	process_checks(force, dti);
 
diff --git a/dtc.h b/dtc.h
index 351fe41..08c9f07 100644
--- a/dtc.h
+++ b/dtc.h
@@ -346,6 +346,7 @@ void generate_fixups_tree(struct dt_info *dti, const char *name);
 void generate_local_fixups_tree(struct dt_info *dti, const char *name);
 
 void update_phandles_ref(struct dt_info *dti);
+void mark_local_phandles(struct dt_info *dti);
 
 /* Checks */
 
diff --git a/livetree.c b/livetree.c
index 9e30a63..2a0a7ed 100644
--- a/livetree.c
+++ b/livetree.c
@@ -1196,3 +1196,29 @@ void update_phandles_ref(struct dt_info *dti)
 {
 	update_phandles_ref_internal(dti, dti->dt);
 }
+
+static void mark_local_phandles_internal(struct dt_info *dti,
+					 struct node *node)
+{
+	struct node *c;
+	struct property *prop;
+	struct marker *m;
+	struct node *refnode;
+
+	for_each_property(node, prop) {
+		m = prop->val.markers;
+		for_each_marker_of_type(m, REF_PHANDLE) {
+			refnode = get_node_by_ref(dti->dt, m->ref);
+			if (refnode)
+				m->is_local = true;
+		}
+	}
+
+	for_each_child(node, c)
+		mark_local_phandles_internal(dti, c);
+}
+
+void mark_local_phandles(struct dt_info *dti)
+{
+	mark_local_phandles_internal(dti, dti->dt);
+}
-- 
2.52.0