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

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Message-ID: <20210406185110.d7mp7grsevndcrr2@ti.com>
Date:   Wed, 7 Apr 2021 00:21:12 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.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

On 02/04/21 01:23PM, Laurent Pinchart wrote:
> 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.

Ok.

> 
> > +
> > +  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

Ok. Though I'd mention that I am not 100% sure what the pll_ref clock is 
supposed to be. The original binding doesn't have a description either.

> 
> > +
> > +  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.

Ok.

> 
> With these small issues addressed,
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Thanks.

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

-- 
Regards,
Pratyush Yadav
Texas Instruments Inc.