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SubjectRe: [PATCH v4 3/9] dt-bindings: pinctrl: Add RZ/A1 bindings doc
On Wed, Apr 05, 2017 at 04:07:21PM +0200, Jacopo Mondi wrote:
> Add device tree bindings documentation for Renesas RZ/A1 gpio and pin
> controller.
>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
> .../bindings/pinctrl/renesas,rza1-pinctrl.txt | 218 +++++++++++++++++++++
> 1 file changed, 218 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/renesas,rza1-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,rza1-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/renesas,rza1-pinctrl.txt
> new file mode 100644
> index 0000000..46584ef
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/renesas,rza1-pinctrl.txt
> @@ -0,0 +1,218 @@
> +Renesas RZ/A1 combined Pin and GPIO controller
> +
> +The Renesas SoCs of RZ/A1 family feature a combined Pin and GPIO controller,
> +named "Ports" in the hardware reference manual.
> +Pin multiplexing and GPIO configuration is performed on a per-pin basis
> +writing configuration values to per-port register sets.
> +Each "port" features up to 16 pins, each of them configurable for GPIO
> +function (port mode) or in alternate function mode.
> +Up to 8 different alternate function modes exist for each single pin.
> +
> +Pin controller node
> +-------------------
> +
> +Required properties:
> + - compatible
> + this shall be "renesas,r7s72100-ports".
> +
> + - reg
> + address base and length of the memory area where pin controller
> + hardware is mapped to.
> +
> +Example:
> +Pin controller node for RZ/A1H SoC (r7s72100)
> +
> +pinctrl: pin-controller@fcfe3000 {
> + compatible = "renesas,r7s72100-ports";
> +
> + reg = <0xfcfe3000 0x4230>;
> +};
> +
> +Sub-nodes
> +---------
> +
> +The child nodes of the pin controller node describe a pin multiplexing
> +function or a gpio controller alternatively.
> +
> +- Pin multiplexing sub-nodes:
> + A pin multiplexing sub-node describes how to configure a set of
> + (or a single) pin in some desired alternate function mode.
> + A single sub-node may define several pin configurations.
> + Some alternate functions require special pin configuration flags to be
> + supplied along with the alternate function configuration number.
> + When hardware reference manual specifies a pin function to be either
> + "bi-directional" or "software IO driven", use the generic properties from
> + <include/linux/pinctrl/pinconf_generic.h> header file to instruct the
> + pin controller to perform the desired pin configuration operations.
> + Please refer to pinctrl-bindings.txt to get to know more on generic
> + pin properties usage.
> +
> + The allowed generic formats for a pin multiplexing sub-node are the
> + following ones:
> +
> + node-1 {
> + pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ... ;
> + GENERIC_PINCONFIG;

What's GENERIC_PINCONFIG? I see this in some other binding docs, but not
used anywhere. If this is a boolean property then get rid of the all
caps. If this is a define, then don't use complex defines that expand to
dts source.

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