linux-kernel - [PATCH 1/6] i2c: provide i2c_adapter

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Message-Id: <20251223-i2c-adapter-dev-wrapper-v1-1-bcf960a48fa9@oss.qualcomm.com>
Date: Tue, 23 Dec 2025 11:08:18 +0100
From: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.com>, Andi Shyti <andi.shyti@...nel.org>,
        Shyam Sundar S K <shyam-sundar.s-k@....com>,
        Nirujogi Pratap <pratap.nirujogi@....com>, Bin Du <bin.du@....com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jan Dabros <jsd@...ihalf.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        Hans Hu <hanshu@...oxin.com>
Cc: Bartosz Golaszewski <brgl@...nel.org>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
Subject: [PATCH 1/6] i2c: provide i2c_adapter_dev()

Provide a wrapper around the dereferencing of i2c_adapter::dev. Once we
convert i2c drivers to using it, it will be possible to finally move the
embedded struct device into a separate, revocable structure protected by
SRCU.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@....qualcomm.com>
---
 include/linux/i2c.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 20fd41b51d5c85ee1665395c07345faafd8e2fca..b5f4db9417aca2e058c8be19d57d693339b6f9b9 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -768,6 +768,11 @@ struct i2c_adapter {
 };
 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
 
+static inline struct device *i2c_adapter_dev(struct i2c_adapter *adap)
+{
+	return &adap->dev;
+}
+
 static inline void *i2c_get_adapdata(const struct i2c_adapter *adap)
 {
 	return dev_get_drvdata(&adap->dev);

-- 
2.47.3