linux-kernel - Re: [PATCH 1/2] dt-bindings: pinctrl: add schema for NXP S32 SoCs

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Date:   Wed, 2 Nov 2022 10:49:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chester Lin <clin@...e.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        s32@....com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Larisa Grigore <larisa.grigore@....com>,
        Ghennadi Procopciuc <Ghennadi.Procopciuc@....com>,
        Andreas Färber <afaerber@...e.de>,
        Matthias Brugger <mbrugger@...e.com>
Subject: Re: [PATCH 1/2] dt-bindings: pinctrl: add schema for NXP S32 SoCs

On Mon, Oct 31, 2022 at 06:08:42PM +0800, Chester Lin wrote:
> Add DT schema for the pinctrl driver of NXP S32 SoC family.
> 
> Signed-off-by: Larisa Grigore <larisa.grigore@....com>
> Signed-off-by: Ghennadi Procopciuc <Ghennadi.Procopciuc@....com>
> Signed-off-by: Chester Lin <clin@...e.com>
> ---
>  .../pinctrl/nxp,s32cc-siul2-pinctrl.yaml      | 91 +++++++++++++++++++
>  1 file changed, 91 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml
> new file mode 100644
> index 000000000000..eafb9091cbf7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/nxp,s32cc-siul2-pinctrl.yaml
> @@ -0,0 +1,91 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (c) 2022 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/nxp,s32cc-siul2-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP S32 Common Chassis SIUL2 iomux controller
> +
> +maintainers:
> +  - Ghennadi Procopciuc <Ghennadi.Procopciuc@....com>
> +  - Chester Lin <clin@...e.com>
> +
> +description: |
> +  Core driver for the pin controller found on S32 Common Chassis SoC.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - nxp,s32g-siul2-pinctrl
> +
> +  reg:
> +    minItems: 5
> +    maxItems: 6
> +    description: A list of register regions to be reserved.

Need to be explicit about what each entry is.

> +
> +  nxp,pins:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description:
> +      A list of [start, end] pin ID boundaries that correspond to each of
> +      the register regions reserved.

Looks like a matrix rather than an array.

> +
> +required:
> +  - compatible
> +  - reg
> +  - nxp,pins
> +
> +patternProperties:
> +  '_pins$':

s/_/-/

> +    type: object

       additionalProperties: false

(and a blank line after)

> +    patternProperties:
> +      '_grp[0-9]$':

s/_/-/

> +        type: object
> +        allOf:
> +          - $ref: pinmux-node.yaml#
> +          - $ref: pincfg-node.yaml#

           unevaluatedProperties: false

> +        description:
> +          Pinctrl node's client devices specify pin muxes using subnodes,
> +          which in turn use the standard properties below.
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +
> +    pinctrl: siul2-pinctrl@...9c240 {

pinctrl@...

> +        compatible = "nxp,s32g-siul2-pinctrl";
> +
> +              /* MSCR range */
> +        reg = <0x4009c240 0x198>,
> +              <0x44010400 0x2c>,
> +              <0x44010480 0xbc>,
> +              /* MSCR range */
> +              <0x4009ca40 0x150>,
> +              <0x44010c1c 0x45c>,
> +              <0x440110f8 0x108>;

What is in these holes in the memory map? Is this part of some larger 
block? If so, that block needs to be described.

> +
> +                   /* MSCR range */
> +        nxp,pins = <0   101>,
> +                   <112 122>,
> +                   <144 190>,
> +                   /* IMCR range */
> +                   <512 595>,
> +                   <631 909>,
> +                   <942 1007>;
> +
> +        llce_can0_pins {
> +            llce_can0_grp0 {
> +                pinmux = <0x2b0>;
> +                input-enable;
> +                slew-rate = <0x00>;
> +            };
> +
> +            llce_can0_grp1 {
> +                pinmux = <0x2c2>;
> +                output-enable;
> +                slew-rate = <0x00>;
> +            };
> +        };
> +    };
> +...
> -- 
> 2.37.3
> 
>