linux-kernel - Re: [PATCH 14/16] dt-bindings: phy: Convert Cadence DPHY binding to YAML

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Date:   Fri, 2 Apr 2021 13:23:25 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Pratyush Yadav <p.yadav@...com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Benoit Parrot <bparrot@...com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Alexandre Courbot <acourbot@...omium.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Helen Koike <helen.koike@...labora.com>,
        Michael Tretter <m.tretter@...gutronix.de>,
        Peter Chen <peter.chen@....com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        dmaengine@...r.kernel.org, Vignesh Raghavendra <vigneshr@...com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: Re: [PATCH 14/16] dt-bindings: phy: Convert Cadence DPHY binding to
 YAML

Hi Pratyush,

Thank you for the patch.

On Tue, Mar 30, 2021 at 11:03:46PM +0530, Pratyush Yadav wrote:
> Convert Cadence DPHY binding to YAML.
> 
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> ---
>  .../devicetree/bindings/phy/cdns,dphy.txt     | 20 --------
>  .../devicetree/bindings/phy/cdns,dphy.yaml    | 51 +++++++++++++++++++
>  2 files changed, 51 insertions(+), 20 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.txt
>  create mode 100644 Documentation/devicetree/bindings/phy/cdns,dphy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy.txt b/Documentation/devicetree/bindings/phy/cdns,dphy.txt
> deleted file mode 100644
> index 1095bc4e72d9..000000000000
> --- a/Documentation/devicetree/bindings/phy/cdns,dphy.txt
> +++ /dev/null
> @@ -1,20 +0,0 @@
> -Cadence DPHY
> -============
> -
> -Cadence DPHY block.
> -
> -Required properties:
> -- compatible: should be set to "cdns,dphy".
> -- reg: physical base address and length of the DPHY registers.
> -- clocks: DPHY reference clocks.
> -- clock-names: must contain "psm" and "pll_ref".
> -- #phy-cells: must be set to 0.
> -
> -Example:
> -	dphy0: dphy@...e0000{
> -		compatible = "cdns,dphy";
> -		reg = <0x0 0xfd0e0000 0x0 0x1000>;
> -		clocks = <&psm_clk>, <&pll_ref_clk>;
> -		clock-names = "psm", "pll_ref";
> -		#phy-cells = <0>;
> -	};
> diff --git a/Documentation/devicetree/bindings/phy/cdns,dphy.yaml b/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
> new file mode 100644
> index 000000000000..d1bbf96a8250
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/cdns,dphy.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/cdns,dphy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Cadence DPHY Device Tree Bindings
> +
> +maintainers:
> +  - Pratyush Yadav <p.yadav@...com>
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: cdns,dphy
> +
> +  reg:
> +    maxItems: 1
> +    description: Physical base address and length of the DPHY registers.

You can drop the description.

> +
> +  clocks:
> +    maxItems: 2
> +    description: DPHY reference clocks.

It's best to describe individual items, which will then allow dropping
the maxItems property:

  clocks:
    items:
      - description: Description of the psm clock
      - description: Description of the pll_ref clock

> +
> +  clock-names:
> +    items:
> +      - const: psm
> +      - const: pll_ref
> +
> +  "#phy-cells":
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - "#phy-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +
> +    dphy0: dphy@...e0000{

This is copied verbatim from the existing description, but while at it,
I'd rename the node from dphy@... to phy@..., as DT node are supposed to
be named according to the class of devices, not the specific device
type.

With these small issues addressed,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> +        compatible = "cdns,dphy";
> +        reg = <0xfd0e0000 0x1000>;
> +        clocks = <&psm_clk>, <&pll_ref_clk>;
> +        clock-names = "psm", "pll_ref";
> +        #phy-cells = <0>;
> +    };

-- 
Regards,

Laurent Pinchart