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-rw-r--r--Documentation/gpio/driver.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/gpio/driver.txt b/Documentation/gpio/driver.txt
index d8de1c7de85a..3392a0fd4c23 100644
--- a/Documentation/gpio/driver.txt
+++ b/Documentation/gpio/driver.txt
@@ -88,6 +88,10 @@ ending up in the pin control back-end "behind" the GPIO controller, usually
closer to the actual pins. This way the pin controller can manage the below
listed GPIO configurations.
+If a pin controller back-end is used, the GPIO controller or hardware
+description needs to provide "GPIO ranges" mapping the GPIO line offsets to pin
+numbers on the pin controller so they can properly cross-reference each other.
+
GPIOs with debounce support
---------------------------