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Subject[PATCH v3 1/5] dt-bindings: gpio: aspeed: Update documentation with ast2600 controllers
The ast2600 is a new generation of SoC from ASPEED. Similarly to the
ast2400 and ast2500, it has a GPIO controller for it's 3.3V GPIO pins.
Additionally, it has a GPIO controller for 36 1.8V GPIO pins. We use
the ngpio property to differentiate between these controllers.

Signed-off-by: Rashmica Gupta <>
Documentation/devicetree/bindings/gpio/gpio-aspeed.txt | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt b/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
index 7e9b586770b0..b2033fc3a71a 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
+++ b/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
@@ -2,7 +2,8 @@ Aspeed GPIO controller Device Tree Bindings

Required properties:
-- compatible : Either "aspeed,ast2400-gpio" or "aspeed,ast2500-gpio"
+- compatible : Either "aspeed,ast2400-gpio", "aspeed,ast2500-gpio",
+ or "aspeed,ast2600-gpio".

- #gpio-cells : Should be two
- First cell is the GPIO line number
@@ -17,7 +18,9 @@ Required properties:

Optional properties:

-- clocks : A phandle to the clock to use for debounce timings
+- clocks : A phandle to the clock to use for debounce timings
+- ngpios : Number of GPIOs controlled by this controller. Should be set
+ when there are multiple GPIO controllers on a SoC (ast2600).

The gpio and interrupt properties are further described in their respective
bindings documentation:
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