Re: [PATCH 4/4] dt-bindings: bus: Convert ACONNECT doc to json-schema

[Rob Herring <robh@kernel.org>]

On Thu, Nov 05, 2020 at 03:54:06PM +0530, Sameer Pujar wrote:
> Move ACONNECT documentation to YAML format.
> 
> Signed-off-by: Sameer Pujar <spujar@nvidia.com>
> ---
>  .../bindings/bus/nvidia,tegra210-aconnect.txt      | 44 -----------
>  .../bindings/bus/nvidia,tegra210-aconnect.yaml     | 86 ++++++++++++++++++++++
>  2 files changed, 86 insertions(+), 44 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.txt
>  create mode 100644 Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.yaml
> 
> diff --git a/Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.txt b/Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.txt
> deleted file mode 100644
> index 3108d03..0000000
> --- a/Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.txt
> +++ /dev/null
> @@ -1,44 +0,0 @@
> -NVIDIA Tegra ACONNECT Bus
> -
> -The Tegra ACONNECT bus is an AXI switch which is used to connnect various
> -components inside the Audio Processing Engine (APE). All CPU accesses to
> -the APE subsystem go through the ACONNECT via an APB to AXI wrapper.
> -
> -Required properties:
> -- compatible: Must be "nvidia,tegra210-aconnect".
> -- clocks: Must contain the entries for the APE clock (TEGRA210_CLK_APE),
> -  and APE interface clock (TEGRA210_CLK_APB2APE).
> -- clock-names: Must contain the names "ape" and "apb2ape" for the corresponding
> -  'clocks' entries.
> -- power-domains: Must contain a phandle that points to the audio powergate
> -  (namely 'aud') for Tegra210.
> -- #address-cells: The number of cells used to represent physical base addresses
> -  in the aconnect address space. Should be 1.
> -- #size-cells: The number of cells used to represent the size of an address
> -  range in the aconnect address space. Should be 1.
> -- ranges: Mapping of the aconnect address space to the CPU address space.
> -
> -All devices accessed via the ACONNNECT are described by child-nodes.
> -
> -Example:
> -
> -	aconnect@702c0000 {
> -		compatible = "nvidia,tegra210-aconnect";
> -		clocks = <&tegra_car TEGRA210_CLK_APE>,
> -			 <&tegra_car TEGRA210_CLK_APB2APE>;
> -		clock-names = "ape", "apb2ape";
> -		power-domains = <&pd_audio>;
> -
> -		#address-cells = <1>;
> -		#size-cells = <1>;
> -		ranges = <0x702c0000 0x0 0x702c0000 0x00040000>;
> -
> -
> -		child1 {
> -			...
> -		};
> -
> -		child2 {
> -			...
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.yaml b/Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.yaml
> new file mode 100644
> index 0000000..f0161bc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/nvidia,tegra210-aconnect.yaml
> @@ -0,0 +1,86 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bus/nvidia,tegra210-aconnect.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NVIDIA Tegra ACONNECT Bus
> +
> +description: |
> +  The Tegra ACONNECT bus is an AXI switch which is used to connnect various
> +  components inside the Audio Processing Engine (APE). All CPU accesses to
> +  the APE subsystem go through the ACONNECT via an APB to AXI wrapper. All
> +  devices accessed via the ACONNNECT are described by child-nodes.
> +
> +maintainers:
> +  - Jon Hunter <jonathanh@nvidia.com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: nvidia,tegra210-aconnect
> +      - items:
> +          - enum:
> +              - nvidia,tegra186-aconnect
> +              - nvidia,tegra194-aconnect
> +          - const: nvidia,tegra210-aconnect
> +
> +  clocks:
> +    items:
> +      - description: Must contain the entry for APE clock
> +      - description: Must contain the entry for APE interface clock
> +
> +  clock-names:
> +    items:
> +      - const: ape
> +      - const: apb2ape
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 1
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^dma-controller(@[0-9a-f]+)?$":
> +    $ref: /schemas/dma/nvidia,tegra210-adma.yaml#
> +  "^interrupt-controller(@[0-9a-f]+)?$":
> +    $ref: /schemas/interrupt-controller/arm,gic.yaml#
> +  "^ahub(@[0-9a-f]+)?$":
> +    $ref: /schemas/sound/nvidia,tegra210-ahub.yaml#

These all get applied already since they match on compatible strings. So 
having them here means the schema is applied twice. There's maybe some 
value to this if it's always going to be these 3 nodes.

Also, the unit-addresses shouldn't be optional.

I'd just do:

"@[0-9a-f]+$":
  type: object

> +
> +required:
> +  - compatible
> +  - clocks
> +  - clock-names
> +  - power-domains
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include<dt-bindings/clock/tegra210-car.h>
> +
> +    aconnect@702c0000 {
> +        compatible = "nvidia,tegra210-aconnect";
> +        clocks = <&tegra_car TEGRA210_CLK_APE>,
> +                 <&tegra_car TEGRA210_CLK_APB2APE>;
> +        clock-names = "ape", "apb2ape";
> +        power-domains = <&pd_audio>;
> +
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        ranges = <0x702c0000 0x702c0000 0x00040000>;
> +
> +        // Child device nodes follow ...
> +    };
> +
> +...
> -- 
> 2.7.4
>