[PATCH v2 01/12] i2c: allow setting the parent device and OF node through the adapter struct

[Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>]

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@oss.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 9c46147e3506d15d53b9b7d6b592709de56e41b9..dd8cec9b04c64b8340d20e018ab5ba28f1f7f5c9 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