diff --git a/include/linux/i2c-mux-gpio.h b/include/linux/i2c-mux-gpio.h
index 4ea1cc7..4406108 100644
--- a/include/linux/i2c-mux-gpio.h
+++ b/include/linux/i2c-mux-gpio.h
@@ -22,6 +22,8 @@
  *	position
  * @n_values: Number of multiplexer positions (busses to instantiate)
  * @classes: Optional I2C auto-detection classes
+ * @gpio_chip: Optional GPIO chip name; if set, GPIO pin numbers are given
+ *	relative to the base GPIO number of that chip
  * @gpios: Array of GPIO numbers used to control MUX
  * @n_gpios: Number of GPIOs used to control MUX
  * @idle: Bitmask to write to MUX when idle or GPIO_I2CMUX_NO_IDLE if not used
@@ -32,6 +34,7 @@
 	const unsigned *values;
 	int n_values;
 	const unsigned *classes;
+	char *gpio_chip;
 	const unsigned *gpios;
 	int n_gpios;
 	unsigned idle;