linux-kernel - [PATCH 01/12] i2c: allow setting the parent device and OF node through the adapter struct

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Message-Id: <20251223-i2c-adap-dev-config-v1-1-4829b1cf0834@oss.qualcomm.com>
Date: Tue, 23 Dec 2025 11:04:39 +0100
From: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Mukesh Kumar Savaliya <mukesh.savaliya@....qualcomm.com>,
        Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
        Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
        Vignesh R <vigneshr@...com>, Aaro Koskinen <aaro.koskinen@....fi>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Andreas Kemnade <andreas@...nade.info>,
        Kevin Hilman <khilman@...libre.com>, Roger Quadros <rogerq@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>, Linus Walleij <linusw@...nel.org>
Cc: Bartosz Golaszewski <brgl@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev,
        linux-rpi-kernel@...ts.infradead.org,
        Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
Subject: [PATCH 01/12] i2c: allow setting the parent device and OF node
 through the adapter struct

In order to stop i2c bus drivers from dereferencing the struct device
embedded in struct i2c_adapter, let's allow configuring the parent
device and OF-node of the adapter directly through dedicated fields.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
---
 drivers/i2c/i2c-core-base.c | 5 +++++
 include/linux/i2c.h         | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index ae7e9c8b65a65c415f5a42f0eb0e7a4ff3e86dce..732828e63730bb773b77ab59362bad8697a1ebde 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1561,6 +1561,11 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 	adap->dev.type = &i2c_adapter_type;
 	device_initialize(&adap->dev);
 
+	if (!adap->dev.parent)
+		adap->dev.parent = adap->parent;
+	if (!adap->dev.of_node)
+		adap->dev.of_node = adap->of_node;
+
 	/*
 	 * This adapter can be used as a parent immediately after device_add(),
 	 * setup runtime-pm (especially ignore-children) before hand.
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 20fd41b51d5c85ee1665395c07345faafd8e2fca..72677f29aff161530bc3c497d1e07144a44eb9e4 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -761,6 +761,10 @@ struct i2c_adapter {
 	struct irq_domain *host_notify_domain;
 	struct regulator *bus_regulator;
 
+	/* Device configuration. */
+	struct device *parent;
+	struct device_node *of_node;
+
 	struct dentry *debugfs;
 
 	/* 7bit address space */

-- 
2.47.3