Re: [PATCH v3 1/5] dt-bindings: pinctrl: add the NXP LX2160A RCW pad mux

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

On Sun, Nov 08, 2026 at 11:06:49AM +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 child of DCFG at its RCWSR12 to RCWSR14
> window: the override registers are at the same offset of the DCSR view
> of the parent. One group per RCW field, one function per encoding.
>
> Each function lists the groups that take it, so a pair the driver
> would refuse, such as can on iic1, is refused by the schema.
>
> Signed-off-by: Vincent Jardin <vjardin@free.fr>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  .../bindings/pinctrl/fsl,lx2160a-rcw-pinmux.yaml   | 264 +++++++++++++++++++++
>  1 file changed, 264 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..6bd21c27a00c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/fsl,lx2160a-rcw-pinmux.yaml
> @@ -0,0 +1,264 @@
> +# 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 can be 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. Its reg is the RCWSR12 to RCWSR14 window of the CCSR view, and
> +  the override registers are at the same offset of the DCSR view.
> +
> +properties:
> +  compatible:
> +    const: fsl,lx2160a-rcw-pinmux
> +
> +  reg:
> +    maxItems: 1
> +
> +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 ]
> +
> +    required:
> +      - function
> +      - groups
> +
> +    allOf:
> +      - if:
> +          properties:
> +            function:
> +              const: asleep
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ asleep ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: can
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic3, iic4 ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: evt
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic3, iic4, evt4-3, evt2-0, asleep ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: flexspi
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ xspi1-data74, xspi1-data30, xspi1-base,
> +                        sdhc2-data74, sdhc2-base ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: flextimer
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic2, irq7-4, irq3-0, evt4-3, evt2-0, clk-out ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: gpio
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ 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, iic1 ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: i2c
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic2, iic3, iic4, iic5, iic6, sdhc2-data74, iic1 ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: irq
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ irq11-8, irq7-4, irq3-0 ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: reset-req
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ reset-req ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: sdhc
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic2, sdhc1-base, sdhc1-dir, sdhc2-data74,
> +                        sdhc2-base ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: sdhc-clk
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic5, iic6 ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: sdhc-data
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ sdhc1-dir ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: sdhc-data4
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ sdhc1-base ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: sdhc-spi
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ sdhc1-base ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: spi
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ iic5, sdhc1-base, sdhc1-dir, sdhc2-base ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: uart
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ uart1-soutsin, uart1-rtscts, uart2-soutsin,
> +                        uart2-rtscts ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: uart3
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ uart1-rtscts ]
> +
> +      - if:
> +          properties:
> +            function:
> +              const: uart4
> +        then:
> +          properties:
> +            groups:
> +              items:
> +                enum: [ uart2-rtscts ]
> +
> +required:
> +  - compatible
> +  - reg
> +
> +allOf:
> +  - $ref: pinctrl.yaml#
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    pinctrl@12c {
> +        compatible = "fsl,lx2160a-rcw-pinmux";
> +        reg = <0x12c 0xc>;
> +
> +        iic3-i2c-pins {
> +            function = "i2c";
> +            groups = "iic3";
> +        };
> +
> +        iic3-gpio-pins {
> +            function = "gpio";
> +            groups = "iic3";
> +        };
> +    };
>
> --
> 2.43.0
>
>
>