[RFC] dt-bindings: firmware: arm,scmi: Add properties for i.MX95 Pinctrl OEM extensions

[Frank Li]

On Thu, May 16, 2024 at 03:30:12PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan at nxp.com>
> 
> i.MX95 Pinctrl is managed by System Control Management Interface(SCMI)
> firmware using OEM extensions. No functions, no groups are provided by
> the firmware. So add i.MX95 specific properties.
> 
> To keep aligned with current i.MX pinctrl bindings, still use "fsl,pins"
> for i.MX95.
> 
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
> ---
> 
> V1:
>  There is already a v6 version for i.MX95 pinctrl with binding got reviewed by
>  Rob, https://lore.kernel.org/all/20240513-pinctrl-scmi-oem-v3-v6-1-904975c99cc4@nxp.com/
>  But after NXP internal discussion, to keep "fsl,pins" for i.MX95 would make
>  it aligned with current i.MX93/8M/7 bindings which people are familiar with,
>  and easy to understand.
> 
>  Sorry to bring back so late after your reviewing in previous generic binding
>  patch. This is not to reject the v6 patch, just wanna to see whether you are
>  happy with "fsl,pins" for i.MX95. If people are happy to accept, I will post
>  out driver together with this patch in new patchset to reject v6. If people are
>  not happy, we could continue with v6.
> 
>  v6: https://lore.kernel.org/all/20240513-pinctrl-scmi-oem-v3-v6-0-904975c99cc4@nxp.com/
> 
>  Thanks,
>  Peng
> 
>  .../bindings/firmware/arm,scmi.yaml           |  4 +-
>  .../firmware/nxp,imx95-scmi-pinctrl.yaml      | 54 +++++++++++++++++++
>  2 files changed, 57 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml
> 
> diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> index 7de2c29606e5..f7a48b1e9f62 100644
> --- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> +++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
> @@ -251,7 +251,9 @@ properties:
>      type: object
>      allOf:
>        - $ref: '#/$defs/protocol-node'
> -      - $ref: /schemas/pinctrl/pinctrl.yaml
> +      - anyOf:
> +          - $ref: /schemas/pinctrl/pinctrl.yaml
> +          - $ref: /schemas/firmware/nxp,imx95-scmi-pinctrl.yaml
>  
>      unevaluatedProperties: false
>  
> diff --git a/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml b/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml
> new file mode 100644
> index 000000000000..3f28c4a171c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/nxp,imx95-scmi-pinctrl.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2024 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/nxp,imx95-scmi-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: i.MX System Control and Management Interface (SCMI) Pinctrl Protocol
> +
> +maintainers:
> +  - Peng Fan <peng.fan at nxp.com>
> +
> +allOf:
> +  - $ref: /schemas/pinctrl/pinctrl.yaml
> +
> +patternProperties:
> +  'grp$':
> +    type: object
> +    description:
> +      Pinctrl node's client devices use subnodes for desired pin configuration.
> +      Client device subnodes use below standard properties.
> +
> +    unevaluatedProperties: false
> +
> +    properties:
> +      fsl,pins:
> +        description:
> +          each entry consists of 6 integers and represents the mux and config
> +          setting for one pin. The first 5 integers <mux_reg conf_reg input_reg
> +          mux_val input_val> are specified using a PIN_FUNC_ID macro, which can
> +          be found in <arch/arm64/boot/dts/freescale/imx95-pinfunc.h>. The last
> +          integer CONFIG is the pad setting value like pull-up on this pin. Please
> +          refer to i.MX8M Plus Reference Manual for detailed CONFIG settings.
> +        $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +        items:
> +          items:
> +            - description: |

needn't "|" 

Frank

> +                "mux_reg" indicates the offset of mux register.
> +            - description: |
> +                "conf_reg" indicates the offset of pad configuration register.
> +            - description: |
> +                "input_reg" indicates the offset of select input register.
> +            - description: |
> +                "mux_val" indicates the mux value to be applied.
> +            - description: |
> +                "input_val" indicates the select input value to be applied.
> +            - description: |
> +                "pad_setting" indicates the pad configuration value to be applied.
> +
> +
> +    required:
> +      - fsl,pins
> +
> +additionalProperties: true
> -- 
> 2.37.1
>