linux-kernel - Re: [PATCH V10 01/10] dt-bindings: remoteproc: convert imx rproc bindings to json-schema

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Date:   Wed, 10 Feb 2021 11:37:41 -0600
From:   Rob Herring <robh@...nel.org>
To:     peng.fan@....nxp.com
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        mathieu.poirier@...aro.org, o.rempel@...gutronix.de,
        devicetree@...r.kernel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        paul@...pouillou.net, matthias.bgg@...il.com, agross@...nel.org,
        patrice.chotard@...com, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V10 01/10] dt-bindings: remoteproc: convert imx rproc
 bindings to json-schema

On Mon, Feb 08, 2021 at 04:56:02PM +0800, peng.fan@....nxp.com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Convert the imx rproc binding to DT schema format using json-schema.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  .../bindings/remoteproc/fsl,imx-rproc.yaml    | 59 +++++++++++++++++++
>  .../bindings/remoteproc/imx-rproc.txt         | 33 -----------
>  2 files changed, 59 insertions(+), 33 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
>  delete mode 100644 Documentation/devicetree/bindings/remoteproc/imx-rproc.txt
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
> new file mode 100644
> index 000000000000..5e906fa6a39d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/remoteproc/fsl,imx-rproc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: NXP iMX6SX/iMX7D Co-Processor Bindings
> +
> +description:
> +  This binding provides support for ARM Cortex M4 Co-processor found on some NXP iMX SoCs.
> +
> +maintainers:
> +  - Peng Fan <peng.fan@....com>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,imx7d-cm4
> +      - fsl,imx6sx-cm4
> +
> +  clocks:
> +    maxItems: 1
> +
> +  syscon:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to syscon block which provide access to System Reset Controller
> +
> +  memory-region:
> +    description:
> +      If present, a phandle for a reserved memory area that used for vdev buffer,
> +      resource table, vring region and others used by remote processor.

You need to define what each one is as a schema. How does the driver 
know which one is the vring region for example? Minimally, it's:

items:
  - description: ...
  - description: ...
  - description: ...

But if what's present is variable, then it gets more complicated. If the 
OS side doesn't need to know what each region is, then you can do just:

minItems: N
maxItems: M

Rob



> +
> +required:
> +  - compatible
> +  - clocks
> +  - syscon
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx7d-clock.h>
> +    m4_reserved_sysmem1: cm4@...00000 {
> +      reg = <0x80000000 0x80000>;
> +    };
> +
> +    m4_reserved_sysmem2: cm4@...00000 {
> +      reg = <0x81000000 0x80000>;
> +    };
> +
> +    imx7d-cm4 {
> +      compatible	= "fsl,imx7d-cm4";
> +      memory-region	= <&m4_reserved_sysmem1>, <&m4_reserved_sysmem2>;
> +      syscon		= <&src>;
> +      clocks		= <&clks IMX7D_ARM_M4_ROOT_CLK>;
> +    };
> +
> +...
> diff --git a/Documentation/devicetree/bindings/remoteproc/imx-rproc.txt b/Documentation/devicetree/bindings/remoteproc/imx-rproc.txt
> deleted file mode 100644
> index fbcefd965dc4..000000000000
> --- a/Documentation/devicetree/bindings/remoteproc/imx-rproc.txt
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -NXP iMX6SX/iMX7D Co-Processor Bindings
> -----------------------------------------
> -
> -This binding provides support for ARM Cortex M4 Co-processor found on some
> -NXP iMX SoCs.
> -
> -Required properties:
> -- compatible		Should be one of:
> -				"fsl,imx7d-cm4"
> -				"fsl,imx6sx-cm4"
> -- clocks		Clock for co-processor (See: ../clock/clock-bindings.txt)
> -- syscon		Phandle to syscon block which provide access to
> -			System Reset Controller
> -
> -Optional properties:
> -- memory-region		list of phandels to the reserved memory regions.
> -			(See: ../reserved-memory/reserved-memory.txt)
> -
> -Example:
> -	m4_reserved_sysmem1: cm4@...00000 {
> -		reg = <0x80000000 0x80000>;
> -	};
> -
> -	m4_reserved_sysmem2: cm4@...00000 {
> -		reg = <0x81000000 0x80000>;
> -	};
> -
> -	imx7d-cm4 {
> -		compatible	= "fsl,imx7d-cm4";
> -		memory-region	= <&m4_reserved_sysmem1>, <&m4_reserved_sysmem2>;
> -		syscon		= <&src>;
> -		clocks		= <&clks IMX7D_ARM_M4_ROOT_CLK>;
> -	};
> -- 
> 2.30.0
>