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-rw-r--r--Documentation/driver-model/device.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/driver-model/device.txt b/Documentation/driver-model/device.txt
index 58cc5dc8fd3..a05ec50f800 100644
--- a/Documentation/driver-model/device.txt
+++ b/Documentation/driver-model/device.txt
@@ -76,6 +76,14 @@ driver_data: Driver-specific data.
platform_data: Platform data specific to the device.
+ Example: for devices on custom boards, as typical of embedded
+ and SOC based hardware, Linux often uses platform_data to point
+ to board-specific structures describing devices and how they
+ are wired. That can include what ports are available, chip
+ variants, which GPIO pins act in what additional roles, and so
+ on. This shrinks the "Board Support Packages" (BSPs) and
+ minimizes board-specific #ifdefs in drivers.
+
current_state: Current power state of the device.
saved_state: Pointer to saved state of the device. This is usable by