linux-kernel - Re: [PATCH] dt-bindings: soc: imx: Add binding doc for spba bus

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Date:   Mon, 2 Nov 2020 11:20:11 -0600
From:   Rob Herring <robh@...nel.org>
To:     Adam Ford <aford173@...il.com>
Cc:     devicetree@...r.kernel.org, aford@...conembedded.com,
        Shawn Guo <shawnguo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: soc: imx: Add binding doc for spba bus

On Sun, Nov 01, 2020 at 07:12:56AM -0600, Adam Ford wrote:
> Add binding doc for fsl,spba-bus.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/Documentation/devicetree/bindings/bus/fsl,spba-bus.yaml b/Documentation/devicetree/bindings/bus/fsl,spba-bus.yaml
> new file mode 100644
> index 000000000000..acb3944168ed
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/fsl,spba-bus.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bus/simple-pm-bus.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Shared Peripherals Bus Interface
> +
> +maintainers:
> +  - Shawn Guo <shawnguo@...nel.org>
> +
> +description: |
> +  A simple bus enabling access to shared peripherals.
> +
> +  The "spba-bus" follows the "simple-bus" set of properties, as
> +  specified in the Devicetree Specification.  It is an extension of
> +  "simple-bus" because the SDMA controller uses this compatible flag to
> +  determine which peripherals are available to it and the range over which
> +  the SDMA can access.  There are no special clocks for the bus, because
> +  the SDMA controller itself has its interrupt, and clock assignments.

select:
  properties:
    compatible:
      contains:
        const: fsl,spba-bus
  required:
    - compatible

(needed to avoid applying to buses with just 'simple-bus')

> +
> +properties:
> +  $nodename:
> +    pattern: "^bus(@[0-9a-f]+)?$"
> +
> +  compatible:
> +    contains:
> +      const: fsl,spba-bus

items:
  - const: fsl,spba-bus
  - const: simple-bus

> +    description:
> +      Shall contain "fsl,spba-bus" in addition to "simple-bus"
> +      compatible strings.

And then drop this.

> +
> +  '#address-cells':
> +    enum: [ 1, 2 ]
> +
> +  '#size-cells':
> +    enum: [ 1, 2 ]
> +
> +  ranges: true
> +
> +required:
> +  - compatible
> +  - '#address-cells'
> +  - '#size-cells'
> +  - ranges
> +
> +additionalProperties: true

We can restrict this to nodes with:

type: object

> +
> +examples:
> +  - |
> +
> +    bus {
> +        compatible = "fsl,spba-bus", "simple-bus";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges;
> +    };
> -- 
> 2.25.1
>