linux-kernel - [RFC PATCH 22/77] dtc: Add export symbols (/export/ keyword) in generated dts file

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Message-ID: <20260112142009.1006236-23-herve.codina@bootlin.com>
Date: Mon, 12 Jan 2026 15:19:12 +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 22/77] dtc: Add export symbols (/export/ keyword) in generated dts file

The export symbols (/export/ keyword) parsing from a dts file is
supported.

Add the support for this keyword in the dts file generation.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 treesource.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/treesource.c b/treesource.c
index 1db6390..9effe38 100644
--- a/treesource.c
+++ b/treesource.c
@@ -320,6 +320,7 @@ static void write_propval(FILE *f, struct property *prop)
 
 static void write_tree_source_node(FILE *f, struct node *tree, int level)
 {
+	struct symbol *exportsym;
 	struct property *prop;
 	struct node *child;
 	struct label *l;
@@ -349,6 +350,18 @@ static void write_tree_source_node(FILE *f, struct node *tree, int level)
 		fprintf(f, "%s", prop->name);
 		write_propval(f, prop);
 	}
+
+	if (tree->exportsymlist)
+		fprintf(f, "\n");
+	for_each_symbol(tree->exportsymlist, exportsym) {
+		write_prefix(f, level+1);
+		fprintf(f, "/export/ %s: ", exportsym->name);
+		if (exportsym->ref[0] == '/')
+			fprintf(f, "&{%s};\n", exportsym->ref);
+		else
+			fprintf(f, "&%s;\n", exportsym->ref);
+	}
+
 	for_each_child(tree, child) {
 		fprintf(f, "\n");
 		write_tree_source_node(f, child, level+1);
-- 
2.52.0