dt-bindings: pinctrl: renesas,rza2-pinctrl: Convert to json-schema
Convert the Renesas RZ/A2 combined Pin and GPIO controller Device Tree binding documentation to json-schema. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Link: https://lore.kernel.org/r/20200626143638.16512-1-geert+renesas@glider.be
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Renesas RZ/A2 combined Pin and GPIO controller
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The Renesas SoCs of the RZ/A2 series feature a combined Pin and GPIO controller.
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Pin multiplexing and GPIO configuration is performed on a per-pin basis.
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Each port features up to 8 pins, each of them configurable for GPIO
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function (port mode) or in alternate function mode.
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Up to 8 different alternate function modes exist for each single pin.
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Pin controller node
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-------------------
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Required properties:
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- compatible: shall be:
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- "renesas,r7s9210-pinctrl": for RZ/A2M
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- reg
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Address base and length of the memory area where the pin controller
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hardware is mapped to.
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- gpio-controller
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This pin controller also controls pins as GPIO
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- #gpio-cells
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Must be 2
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- gpio-ranges
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Expresses the total number of GPIO ports/pins in this SoC
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Example: Pin controller node for RZ/A2M SoC (r7s9210)
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pinctrl: pin-controller@fcffe000 {
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compatible = "renesas,r7s9210-pinctrl";
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reg = <0xfcffe000 0x1000>;
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gpio-controller;
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#gpio-cells = <2>;
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gpio-ranges = <&pinctrl 0 0 176>;
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};
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Sub-nodes
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---------
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The child nodes of the pin controller designate pins to be used for
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specific peripheral functions or as GPIO.
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- Pin multiplexing sub-nodes:
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A pin multiplexing sub-node describes how to configure a set of
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(or a single) pin in some desired alternate function mode.
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The values for the pinmux properties are a combination of port name, pin
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number and the desired function index. Use the RZA2_PINMUX macro located
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in include/dt-bindings/pinctrl/r7s9210-pinctrl.h to easily define these.
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For assigning GPIO pins, use the macro RZA2_PIN also in r7s9210-pinctrl.h
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to express the desired port pin.
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Required properties:
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- pinmux:
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integer array representing pin number and pin multiplexing configuration.
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When a pin has to be configured in alternate function mode, use this
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property to identify the pin by its global index, and provide its
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alternate function configuration number along with it.
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When multiple pins are required to be configured as part of the same
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alternate function they shall be specified as members of the same
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argument list of a single "pinmux" property.
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Helper macros to ease assembling the pin index from its position
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(port where it sits on and pin number) and alternate function identifier
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are provided by the pin controller header file at:
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<dt-bindings/pinctrl/r7s9210-pinctrl.h>
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Integers values in "pinmux" argument list are assembled as:
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((PORT * 8 + PIN) | MUX_FUNC << 16)
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Example: Board specific pins configuration
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&pinctrl {
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/* Serial Console */
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scif4_pins: serial4 {
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pinmux = <RZA2_PINMUX(PORT9, 0, 4)>, /* TxD4 */
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<RZA2_PINMUX(PORT9, 1, 4)>; /* RxD4 */
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};
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};
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Example: Assigning a GPIO:
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leds {
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status = "okay";
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compatible = "gpio-leds";
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led0 {
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/* P6_0 */
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gpios = <&pinctrl RZA2_PIN(PORT6, 0) GPIO_ACTIVE_HIGH>;
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};
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};
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@ -0,0 +1,100 @@
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/pinctrl/renesas,rza2-pinctrl.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Renesas RZ/A2 combined Pin and GPIO controller
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maintainers:
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- Chris Brandt <chris.brandt@renesas.com>
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- Geert Uytterhoeven <geert+renesas@glider.be>
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description:
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The Renesas SoCs of the RZ/A2 series feature a combined Pin and GPIO
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controller.
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Pin multiplexing and GPIO configuration is performed on a per-pin basis.
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Each port features up to 8 pins, each of them configurable for GPIO function
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(port mode) or in alternate function mode.
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Up to 8 different alternate function modes exist for each single pin.
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properties:
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compatible:
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const: "renesas,r7s9210-pinctrl" # RZ/A2M
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reg:
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maxItems: 1
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gpio-controller: true
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'#gpio-cells':
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const: 2
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description:
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The first cell contains the global GPIO port index, constructed using the
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RZA2_PIN() helper macro in r7s9210-pinctrl.h.
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E.g. "RZA2_PIN(PORT6, 0)" for P6_0.
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gpio-ranges:
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maxItems: 1
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patternProperties:
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"^.*$":
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if:
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type: object
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then:
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allOf:
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- $ref: pincfg-node.yaml#
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- $ref: pinmux-node.yaml#
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description:
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The child nodes of the pin controller designate pins to be used for
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specific peripheral functions or as GPIO.
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A pin multiplexing sub-node describes how to configure a set of
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(or a single) pin in some desired alternate function mode.
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The values for the pinmux properties are a combination of port name,
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pin number and the desired function index. Use the RZA2_PINMUX macro
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located in include/dt-bindings/pinctrl/r7s9210-pinctrl.h to easily
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define these.
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For assigning GPIO pins, use the macro RZA2_PIN also in
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to express the desired port pin.
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properties:
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phandle: true
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pinmux:
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description:
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Values are constructed from GPIO port number, pin number, and
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alternate function configuration number using the RZA2_PINMUX()
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helper macro in r7s9210-pinctrl.h.
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required:
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- pinmux
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additionalProperties: false
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required:
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- compatible
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- reg
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- gpio-controller
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- '#gpio-cells'
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- gpio-ranges
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/pinctrl/r7s9210-pinctrl.h>
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pinctrl: pin-controller@fcffe000 {
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compatible = "renesas,r7s9210-pinctrl";
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reg = <0xfcffe000 0x1000>;
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gpio-controller;
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#gpio-cells = <2>;
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gpio-ranges = <&pinctrl 0 0 176>;
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/* Serial Console */
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scif4_pins: serial4 {
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pinmux = <RZA2_PINMUX(PORT9, 0, 4)>, /* TxD4 */
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<RZA2_PINMUX(PORT9, 1, 4)>; /* RxD4 */
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};
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};
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