[v3,02/14] Documentation: dt/bindings: Document pinctrl-gpio

This commit adds documentation for the devicetree bidings of the
pinctrl-gpio driver, which handles GPIOs of the Ingenic SoCs
currently supported by the Linux kernel.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 .../devicetree/bindings/gpio/ingenic,gpio.txt      | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/ingenic,gpio.txt

v2: New patch
v3: No changes

On Wed, Jan 25, 2017 at 07:51:55PM +0100, Paul Cercueil wrote:
> This commit adds documentation for the devicetree bidings of the

s/biding/bindings/

> pinctrl-gpio driver, which handles GPIOs of the Ingenic SoCs
> currently supported by the Linux kernel.

The subject makes no reference that this binding is for Ingenic GPIO. 
Also, drop the "Documentation: " part. It's redundant.

> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>  .../devicetree/bindings/gpio/ingenic,gpio.txt      | 45 ++++++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> 
> v2: New patch
> v3: No changes
> 
> diff --git a/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt b/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> new file mode 100644
> index 000000000000..b2eb20494365
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
> @@ -0,0 +1,45 @@
> +Ingenic jz47xx GPIO controller
> +
> +Required properties:
> +  - compatible:
> +    - "ingenic,jz4740-gpio" for the JZ4740 SoC
> +    - "ingenic,jz4780-gpio" for the JZ4780 SoC
> +
> +  - reg: Base address and length of each memory resource used by the GPIO
> +    controller hardware module.
> +
> +  - gpio-controller: Marks the device node as a GPIO controller.
> +  - #gpio-cells: Should be 2. The first cell is the GPIO number and the second
> +    cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>. Only the
> +    GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
> +  - gpio-ranges: Range of pins managed by the GPIO controller.
> +
> +Optional properties:
> +  - base: The GPIO number to use as the base for this driver.

Drop this please. This is a Linuxism.

> +  - interrupt-controller: Marks the device node as an interrupt controller.
> +  - interrupts: Interrupt specifier for the controllers interrupt.
> +    Required if 'interrupt-controller' is specified.

Some h/w doesn't have interrupt capability? If not, this should not be 
optional.

> +
> +Please refer to gpio.txt in this directory for details of gpio-ranges property
> +and the common GPIO bindings used by client devices.
> +
> +The GPIO controller also acts as an interrupt controller. It uses the default
> +two cells specifier as described in Documentation/devicetree/bindings/
> +interrupt-controller/interrupts.txt.

Just document #interrupt-cells and its value and drop this paragraph.

> +
> +Example:
> +
> +gpa: gpio-controller@10010000 {
> +	compatible = "ingenic,jz4740-gpio";
> +	reg = <0x10010000 0x100>;
> +
> +	gpio-controller;
> +	gpio-ranges = <&pinctrl 0 0 32>;
> +	#gpio-cells = <2>;
> +
> +	interrupt-controller;
> +	#interrupt-cells = <2>;
> +
> +	interrupt-parent = <&intc>;
> +	interrupts = <28>;
> +};
> -- 
> 2.11.0
> 
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