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Date:   Mon, 18 Jan 2021 00:34:24 +0000
From:   Daniel Scally <>
Subject: [PATCH v2 3/7] i2c: i2c-core-base: Use format macro in i2c_dev_set_name()

Some places in the kernel allow users to map resources to a device
using device name (for example, gpiod_lookup_table). Currently
this involves waiting for the i2c_client to have been registered so we
can use dev_name(&client->dev). We want to add a function to allow users
to refer to an i2c device by name before it has been instantiated, so
create a macro for the format that's accessible outside the i2c layer
and use it in i2c_dev_set_name()

Suggested-by: Andy Shevchenko <>
Signed-off-by: Daniel Scally <>
	- Used format macro in i2c_dev_set_name() instead of sub func

 drivers/i2c/i2c-core-base.c | 4 ++--
 include/linux/i2c.h         | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 63ebf722a424..547b8926cac8 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -811,12 +811,12 @@ static void i2c_dev_set_name(struct i2c_adapter *adap,
 	struct acpi_device *adev = ACPI_COMPANION(&client->dev);
 	if (info && info->dev_name) {
-		dev_set_name(&client->dev, "i2c-%s", info->dev_name);
+		dev_set_name(&client->dev, I2C_DEV_NAME_FORMAT, info->dev_name);
 	if (adev) {
-		dev_set_name(&client->dev, "i2c-%s", acpi_dev_name(adev));
+		dev_set_name(&client->dev, I2C_DEV_NAME_FORMAT, acpi_dev_name(adev));
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 56622658b215..4d40a4b46810 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -39,6 +39,9 @@ enum i2c_slave_event;
 typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
 			      enum i2c_slave_event event, u8 *val);
+/* I2C Device Name Format - to maintain consistency outside the i2c layer */
+#define I2C_DEV_NAME_FORMAT		"i2c-%s"
 /* I2C Frequency Modes */
 #define I2C_MAX_STANDARD_MODE_FREQ	100000
 #define I2C_MAX_FAST_MODE_FREQ		400000

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