linux-kernel - Re: [PATCH v4 1/4] dt-bindings: firmware: Add bindings for xilinx firmware

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Date:   Fri, 30 Apr 2021 14:40:00 -0500
From:   Rob Herring <robh@...nel.org>
To:     Nava kishore Manne <nava.manne@...inx.com>
Cc:     michal.simek@...inx.com, mdf@...nel.org, trix@...hat.com,
        gregkh@...uxfoundation.org, arnd@...db.de, rajan.vaja@...inx.com,
        amit.sunil.dhamne@...inx.com, manish.narani@...inx.com,
        zou_wei@...wei.com, lakshmi.sai.krishna.potthuri@...inx.com,
        iwamatsu@...auri.org, wendy.liang@...inx.com,
        linus.walleij@...aro.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org, chinnikishore369@...il.com,
        git@...inx.com
Subject: Re: [PATCH v4 1/4] dt-bindings: firmware: Add bindings for xilinx
 firmware

On Thu, Apr 29, 2021 at 07:34:05PM +0530, Nava kishore Manne wrote:
> Add documentation to describe Xilinx firmware driver bindings.
> Firmware driver provides an interface to firmware APIs.
> Interface APIs can be used by any driver to communicate
> to Platform Management Unit.
> 
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
> Changes for v4:
>                 -Added new yaml file for xilinx firmware
>                  as suggested by Rob.
> 
>  .../firmware/xilinx/xlnx,zynqmp-firmware.yaml | 63 +++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml

What about the old doc?:

Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.txt

> 
> diff --git a/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
> new file mode 100644
> index 000000000000..4b97f005bed7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/xilinx/xlnx,zynqmp-firmware.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xilinx firmware driver
> +
> +maintainers:
> +  - Nava kishore Manne <nava.manne@...inx.com>
> +
> +description:
> +  The zynqmp-firmware node describes the interface to platform firmware.
> +  ZynqMP has an interface to communicate with secure firmware. Firmware
> +  driver provides an interface to firmware APIs. Interface APIs can be
> +  used by any driver to communicate to PMUFW(Platform Management Unit).
> +  These requests include clock management, pin control, device control,
> +  power management service, FPGA service and other platform management
> +  services.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - description:
> +          For implementations complying for Zynq Ultrascale+ MPSoC.
> +        const: xlnx,zynqmp-firmware
> +
> +      - description:
> +          For implementations complying for Versal.
> +        const: xlnx,versal-firmware
> +
> +  method:
> +    description: The method of calling the PM-API firmware layer.
> +                #  Permitted values are:
> +                #  - "smc" : SMC #0, following the SMCCC
> +                #  - "hvc" : HVC #0, following the SMCCC

Drop the '#'. If you want to maintain the formatting, then use '|' after 
'description:' for a literal block.

> +    $ref: /schemas/types.yaml#/definitions/string-array
> +    enum:
> +      - smc
> +      - hvc
> +
> +patternProperties:
> +  "fpga":

So 'foofpgabar' is valid?

> +    description: Compatible of the FPGA device.
> +    type: object
> +
> +    required:
> +      - compatible

This belongs in the fpga schema which should have a $ref here. (Which 
means this patch needs to come 2nd.)

> +
> +required:
> +  - compatible
> +
> +examples:
> +  - |
> +    versal-firmware {
> +      compatible = "xlnx,versal-firmware";
> +      method = "smc";
> +      fpga {
> +        compatible = "xlnx,versal-fpga";
> +      };
> +    };
> +
> +additionalProperties: false
> -- 
> 2.17.1
>