Re: [PATCH v3 11/11] dt-bindings: gpio: Add bindings for Cadence I3C gpio expander

[Rob Herring]

On Fri, Mar 23, 2018 at 12:00:20PM +0100, Boris Brezillon wrote:
> Document the Cadence I3C gpio expander bindings.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
> ---
>  .../devicetree/bindings/gpio/gpio-cdns-i3c.txt     | 38 ++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
> new file mode 100644
> index 000000000000..634b1f268215
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-cdns-i3c.txt
> @@ -0,0 +1,38 @@
> +* Cadence I3C GPIO expander
> +
> +The Cadence I3C GPIO expander provides 8 GPIOs controllable over I3C.
> +This GPIOs can be configured in output or input mode and if they are in input
> +mode they can generate IBIs (In Band Interrupts).
> +
> +Required properties for GPIO node:
> +- reg : 3 cells encoding the I3C static address (none in our case) and the I3C
> +	Provisional ID. See Documentation/devicetree/bindings/i3c/i3c.txt for
> +	more details.
> +	Should be <0x0 0x392 0x0>.
> +- gpio-controller : Marks the device node as a gpio controller.
> +- #gpio-cells : Should be two. The first cell is the pin number and
> +  the second cell is used to specify the gpio polarity:
> +      0 = active high
> +      1 = active low
> +- interrupt-controller: Marks the device node as an interrupt controller.
> +- #interrupt-cells : Should be 2.  The first cell is the GPIO number.
> +  The second cell bits[3:0] is used to specify trigger type and level flags:
> +      1 = low-to-high edge triggered.
> +      2 = high-to-low edge triggered.
> +      3 = triggered on both edges.
> +      4 = active high level-sensitive.
> +      8 = active low level-sensitive.
> +
> +Example:
> +
> +	i3c-master@xxx {
> +		...
> +		i3c_gpio_expander: gpio@0,1c9,0 {

The unit address is wrong here.

> +			reg = <0 0x392 0x0>;
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +			interrupt-controller;
> +			#interrupt-cells = <2>;
> +		};
> +		...
> +	};
> -- 
> 2.14.1
>