Re: [PATCH v5 4/9] dt-bindings: gpio: Add gpio nodes for Actions S900 SoC

[Rob Herring]

On Fri, Mar 09, 2018 at 10:43:40AM +0530, Manivannan Sadhasivam wrote:
> Add gpio nodes for Actions Semi S900 SoC.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> ---
>  .../devicetree/bindings/gpio/actions,owl-gpio.txt  | 90 ++++++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/actions,owl-gpio.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpio/actions,owl-gpio.txt b/Documentation/devicetree/bindings/gpio/actions,owl-gpio.txt
> new file mode 100644
> index 000000000000..ad7d32ce2abe
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/actions,owl-gpio.txt
> @@ -0,0 +1,90 @@
> +* Actions Semi OWL GPIO controller bindings
> +
> +The GPIOs are organized as individual banks/ports with variable number
> +of GPIOs. Each bank is represented as an individual GPIO controller.
> +
> +Required properties:
> +- compatible            : Should be "actions,s900-gpio"
> +- reg                   : Address and range of the GPIO controller registers.
> +- 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 is used to specify optional
> +                          parameters.
> +- ngpios                : Specifies the number of GPIO lines.
> +- interrupt-controller  : Marks the device node as an interrupt controller.
> +- #interrupt-cells      : Specifies the number of cells needed to encode an
> +                          interrupt.  Shall be set to 2.  The first cell
> +                          defines the interrupt number, the second encodes
> +                          the trigger flags described in
> +                          bindings/interrupt-controller/interrupts.txt
> +
> +Optional properties:
> +- gpio-ranges           : Mapping between GPIO and pinctrl
> +
> +Examples:
> +
> +       gpioa: gpio@e01b0000 {
> +               compatible = "actions,s900-gpio";
> +               reg = <0x0 0xe01b0000 0x0 0x1000>;
> +               gpio-controller;
> +               #gpio-cells = <2>;
> +               gpio-ranges = <&pinctrl 0 0 32>;
> +               ngpios = <32>;

This is only needed if the number of gpios is reduced for some reason 
such as not pinned out. IOW, 32 is implied because that's the size of 
each bank.

> +               interrupt-controller;
> +               #interrupt-cells = <2>;
> +       };
> +
> +       gpiob: gpio@e01b000c {
> +               compatible = "actions,s900-gpio";
> +               reg = <0x0 0xe01b000c 0x0 0x1000>;

Due to the sizes, these are still overlapping.

Rob

> +               gpio-controller;
> +               #gpio-cells = <2>;
> +               gpio-ranges = <&pinctrl 0 32 32>;
> +               ngpios = <32>;
> +               interrupt-controller;
> +               #interrupt-cells = <2>;
> +       };