Re: [PATCH 1/5] dt-bindings: pinctrl: add the NXP LX2160A RCW pad mux

[Frank Li <Frank.li@oss.nxp.com>]

On Tue, Nov 03, 2026 at 10:51:54AM +0100, Vincent Jardin via B4 Relay wrote:
> From: Vincent Jardin <vjardin@free.fr>
>
> The LX2160A muxes its IIC, XSPI, SDHC, UART, IRQ and EVT pads from
> fields of the RCW: read-only in RCWSR12..14 of DCFG, changed at runtime
> through the override registers of its DCSR view.
>
> Describe the pad mux as a node without registers, a child of DCFG: one
> group per RCW field, one function per encoding.
>
> Signed-off-by: Vincent Jardin <vjardin@free.fr>
> ---
>  .../bindings/pinctrl/fsl,lx2160a-rcw-pinmux.yaml   | 71 ++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/fsl,lx2160a-rcw-pinmux.yaml b/Documentation/devicetree/bindings/pinctrl/fsl,lx2160a-rcw-pinmux.yaml
> new file mode 100644
> index 000000000000..d79edcb077f8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/fsl,lx2160a-rcw-pinmux.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/fsl,lx2160a-rcw-pinmux.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP LX2160A RCW pad muxes
> +
> +maintainers:
> +  - Vincent Jardin <vjardin@free.fr>
> +
> +description:
> +  The LX2160A muxes its IIC, XSPI, SDHC, UART, IRQ and EVT pads based on its
> +  RCW. The related fields are from the read-only RCWSR12 to RCWSR14 registers
> +  of DCFG, and changed at runtime by writing the RCW override registers in
> +  the DCSR view of DCFG. The node is a child of the DCFG node, which owns both
> +  views, and needs no registers of its own. A pad group is one field, named
> +  from its pads. A board selects a state of its own with the usual
> +  pinctrl-0 on this node, a hog.
> +
> +properties:
> +  compatible:
> +    const: fsl,lx2160a-rcw-pinmux
> +
> +patternProperties:
> +  '-pins$':
> +    type: object
> +    $ref: pinmux-node.yaml#
> +    additionalProperties: false
> +
> +    properties:
> +      function:
> +        enum: [ asleep, can, evt, flexspi, flextimer, gpio, i2c, irq,
> +                reset-req, sdhc, sdhc-clk, sdhc-data, sdhc-data4, sdhc-spi,
> +                spi, uart, uart3, uart4 ]
> +
> +      groups:
> +        items:
> +          enum: [ iic1, iic2, iic3, iic4, iic5, iic6, xspi1-data74,
> +                  xspi1-data30, xspi1-base, sdhc1-base, sdhc1-dir,
> +                  sdhc2-data74, sdhc2-base, uart1-soutsin, uart1-rtscts,
> +                  uart2-soutsin, uart2-rtscts, irq11-8, irq7-4, irq3-0,
> +                  evt4-3, evt2-0, clk-out, asleep, reset-req ]

how to know which function belong to which group?

Frank

> +
> +    required:
> +      - function
> +      - groups
> +
> +required:
> +  - compatible
> +
> +allOf:
> +  - $ref: pinctrl.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    pinctrl {
> +        compatible = "fsl,lx2160a-rcw-pinmux";
> +
> +        iic3-i2c-pins {
> +            function = "i2c";
> +            groups = "iic3";
> +        };
> +
> +        iic3-gpio-pins {
> +            function = "gpio";
> +            groups = "iic3";
> +        };
> +    };
>
> --
> 2.43.0
>
>
>