linux-kernel - [PATCH 1/8] of: provide of_machine_get

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Message-Id: <20260119-soc-of-root-v1-1-32a0fa9a78b4@oss.qualcomm.com>
Date: Mon, 19 Jan 2026 11:40:12 +0100
From: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Danilo Krummrich <dakr@...nel.org>,
        "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>, Chen-Yu Tsai <wens@...nel.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
        imx@...ts.linux.dev, linux-renesas-soc@...r.kernel.org,
        linux-sunxi@...ts.linux.dev,
        Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
Subject: [PATCH 1/8] of: provide of_machine_get_compatible()

Provide a helper function allowing users to read the compatible string
of the machine, hiding the access to the root node.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
---
 drivers/of/base.c  | 13 +++++++++++++
 include/linux/of.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 0b65039ece53aa90f30da2420a893a02ab4c6dd8..a7e27d5355929abd6d156b80c52f8f8b08fe6da1 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -434,6 +434,19 @@ bool of_machine_compatible_match(const char *const *compats)
 }
 EXPORT_SYMBOL(of_machine_compatible_match);
 
+/**
+ * of_machine_get_compatible - Get the compatible string of this machine
+ * @compatible: address at which the compatible string will be stored
+ *
+ * Returns:
+ * 0 on success, negative error number on failure.
+ */
+int of_machine_get_compatible(const char **compatible)
+{
+	return of_property_read_string(of_root, "compatible", compatible);
+}
+EXPORT_SYMBOL_GPL(of_machine_get_compatible);
+
 /**
  * of_machine_device_match - Test root of device tree against a of_device_id array
  * @matches:	NULL terminated array of of_device_id match structures to search in
diff --git a/include/linux/of.h b/include/linux/of.h
index 9bbdcf25a2b448ba4ec5ddee8b35a105ca4aab8b..75423fb556ee4c108ce25144a0bdc252a89f7d1d 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -426,6 +426,8 @@ static inline bool of_machine_is_compatible(const char *compat)
 	return of_machine_compatible_match(compats);
 }
 
+int of_machine_get_compatible(const char **compatible);
+
 extern int of_add_property(struct device_node *np, struct property *prop);
 extern int of_remove_property(struct device_node *np, struct property *prop);
 extern int of_update_property(struct device_node *np, struct property *newprop);

-- 
2.47.3