dt-bindings: pinctrl: at91-pio4: add property for drive strength

Add drive strength property which is equivalent with the one in Linux

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>

diff --git a/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt b/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt
index a376c6f..9252dc1 100644 (file)
--- a/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt
+++ b/doc/device-tree-bindings/pinctrl/atmel,at91-pio4-pinctrl.txt
@@ -28,6 +28,8 @@ Optional properties:
 - GENERIC_PINCONFIG: generic pinconfig options to use, bias-disable,
 bias-pull-down, bias-pull-up, drive-open-drain, input-schmitt-enable,
 input-debounce.
+- atmel,drive-strength: 0 or 1 for low drive, 2 for medium drive and 3 for
+high drive. The default value is low drive.
 
 Example: