linux-kernel - [PATCH v3 01/12] of: Add for_each_compatible_node

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Message-Id: <20260109-of-for-each-compatible-scoped-v3-1-c22fa2c0749a@oss.qualcomm.com>
Date: Fri, 09 Jan 2026 17:57:45 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
To: Miguel Ojeda <ojeda@...nel.org>, Rob Herring <robh@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
        Bill Wendling <morbo@...gle.com>,
        Justin Stitt <justinstitt@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...on.dev>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
        Nipun Gupta <nipun.gupta@....com>,
        Nikhil Agarwal <nikhil.agarwal@....com>,
        Abel Vesa <abelvesa@...nel.org>, Peng Fan <peng.fan@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, Vinod Koul <vkoul@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        llvm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-clk@...r.kernel.org, imx@...ts.linux.dev,
        dmaengine@...r.kernel.org, linux-media@...r.kernel.org,
        linux-pm@...r.kernel.org,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH v3 01/12] of: Add for_each_compatible_node_scoped() helper

Just like looping through children and available children, add a scoped
helper for for_each_compatible_node() so error paths can drop
of_node_put() leading to simpler code.

Suggested-by: Jonathan Cameron <jonathan.cameron@...wei.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
---

Prerequisite for all further patches.
---
 .clang-format                      | 1 +
 include/linux/of.h                 | 7 +++++++
 scripts/dtc/dt-extract-compatibles | 1 +
 3 files changed, 9 insertions(+)

diff --git a/.clang-format b/.clang-format
index c7060124a47a..1cc151e2adcc 100644
--- a/.clang-format
+++ b/.clang-format
@@ -259,6 +259,7 @@ ForEachMacros:
   - 'for_each_collection'
   - 'for_each_comp_order'
   - 'for_each_compatible_node'
+  - 'for_each_compatible_node_scoped'
   - 'for_each_component_dais'
   - 'for_each_component_dais_safe'
   - 'for_each_conduit'
diff --git a/include/linux/of.h b/include/linux/of.h
index 9bbdcf25a2b4..be6ec4916adf 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1485,6 +1485,13 @@ static inline int of_property_read_s32(const struct device_node *np,
 #define for_each_compatible_node(dn, type, compatible) \
 	for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 	     dn = of_find_compatible_node(dn, type, compatible))
+
+#define for_each_compatible_node_scoped(dn, type, compatible) \
+	for (struct device_node *dn __free(device_node) =		\
+	     of_find_compatible_node(NULL, type, compatible);		\
+	     dn;							\
+	     dn = of_find_compatible_node(dn, type, compatible))
+
 #define for_each_matching_node(dn, matches) \
 	for (dn = of_find_matching_node(NULL, matches); dn; \
 	     dn = of_find_matching_node(dn, matches))
diff --git a/scripts/dtc/dt-extract-compatibles b/scripts/dtc/dt-extract-compatibles
index 6570efabaa64..87999d707390 100755
--- a/scripts/dtc/dt-extract-compatibles
+++ b/scripts/dtc/dt-extract-compatibles
@@ -72,6 +72,7 @@ def parse_compatibles(file, compat_ignore_list):
 		compat_list += parse_of_functions(data, "_is_compatible")
 		compat_list += parse_of_functions(data, "of_find_compatible_node")
 		compat_list += parse_of_functions(data, "for_each_compatible_node")
+		compat_list += parse_of_functions(data, "for_each_compatible_node_scoped")
 		compat_list += parse_of_functions(data, "of_get_compatible_child")
 
 	return compat_list

-- 
2.51.0