linux-kernel - Re: [PATCH v2 2/4] dt-bindings: i3c: Describe Silvaco master binding

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Date:   Mon, 24 Aug 2020 17:24:38 -0600
From:   Rob Herring <robh@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Boris Brezillon <boris.brezillon@...labora.com>,
        linux-i3c@...ts.infradead.org, devicetree@...r.kernel.org,
        Nicolas Pitre <nico@...xnic.net>,
        Rajeev Huralikoppi <rajeev.huralikoppi@...vaco.com>,
        Conor Culhane <conor.culhane@...vaco.com>,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 2/4] dt-bindings: i3c: Describe Silvaco master binding

On Wed, Aug 12, 2020 at 04:13:10PM +0200, Miquel Raynal wrote:
> Silvaco provide a dual-role I3C master.
> 
> Description is rather simple: it needs a register mapping, three
> clocks and an interrupt.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
> 
> Changes in v2:
> * Updated Rob's tool and fixed the mistake reported.
> * Updated the vendor prefix.
> 
>  .../bindings/i3c/silvaco,i3c-master.yaml      | 59 +++++++++++++++++++
>  1 file changed, 59 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> new file mode 100644
> index 000000000000..63731e8a9068
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i3c/silvaco,i3c-master.yaml
> @@ -0,0 +1,59 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i3c/silvaco,i3c-master.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Silvaco I3C master
> +
> +maintainers:
> +  - Conor Culhane <conor.culhane@...vaco.com>
> +
> +properties:
> +  compatible:
> +    const: silvaco,i3c-master
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clock-names:
> +    description: |
> +      There are three clocks:
> +        pclk:     System clock
> +        fast_clk: Fast clock (for the bus)
> +        slow_clk: Slow clock (for other events)

You basically say this in the schema... If you want some description, do 
it in 'clocks':

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

> +
> +    items:
> +      - const: pclk
> +      - const: fast_clk
> +      - const: slow_clk
> +
> +  clocks:
> +    minItems: 3
> +    maxItems: 3
> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clock-names
> +  - clocks

additionalProperties: false

And that will point out some errors in the example.

> +
> +examples:
> +  - |
> +    i3c-master@...00000 {
> +        compatible = "silvaco,i3c-master";
> +        clocks = <&zynqmp_clk 71>, <&fclk>, <&sclk>;
> +        clock-names = "pclk", "fast_clk", "slow_clk";
> +        interrupt-parent = <&gic>;
> +        interrupts = <0 89 4>;
> +        reg = <0xa0000000 0x1000>;
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +    };
> -- 
> 2.20.1
>