linux-kernel - Re: [PATCH 2/6] dt-bindings: net: marvell,dfx-server: Convert to yaml

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Message-ID: <20221124003413.6a2c4518@xps-13>
Date:   Thu, 24 Nov 2022 00:34:13 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzk+dt@...nel.org>,
        devicetree@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        Marcin Wojtas <mw@...ihalf.com>,
        Russell King <linux@...linux.org.uk>,
        Taras Chornyi <tchornyi@...vell.com>,
        linux-kernel@...r.kernel.org,
        Robert Marko <robert.marko@...tura.hr>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Michael Walle <michael@...le.cc>
Subject: Re: [PATCH 2/6] dt-bindings: net: marvell,dfx-server: Convert to
 yaml

Hi Rob,

robh@...nel.org wrote on Wed, 23 Nov 2022 16:10:23 -0600:

> On Thu, Nov 17, 2022 at 10:55:53PM +0100, Miquel Raynal wrote:
> > Even though this description is not used anywhere upstream (no matching
> > driver), while on this file I decided I would try a conversion to yaml
> > in order to clarify the prestera family description.
> > 
> > I cannot keep the nodename dfx-server@...x so I switched to dfx-bus@...x
> > which matches simple-bus.yaml. Otherwise I took the example context from
> > the only user of this compatible: armada-xp-98dx3236.dtsi, which is a
> > rather old and not perfect DT.
> > 
> > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > ---
> > I am fine dropping this file entirely as well, if judged useless.
> > ---
> >  .../bindings/net/marvell,dfx-server.yaml      | 60 +++++++++++++++++++
> >  .../bindings/net/marvell,prestera.txt         | 18 ------
> >  2 files changed, 60 insertions(+), 18 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/net/marvell,dfx-server.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/net/marvell,dfx-server.yaml b/Documentation/devicetree/bindings/net/marvell,dfx-server.yaml
> > new file mode 100644
> > index 000000000000..72151a78396f
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/marvell,dfx-server.yaml
> > @@ -0,0 +1,60 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/net/marvell,dfx-server.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Marvell Prestera DFX server
> > +
> > +maintainers:
> > +  - Miquel Raynal <miquel.raynal@...tlin.com>
> > +
> > +select:
> > +  properties:
> > +    compatible:
> > +      contains:
> > +        const: marvell,dfx-server
> > +  required:
> > +    - compatible
> > +
> > +properties:
> > +  compatible:
> > +    items:
> > +      - const: marvell,dfx-server
> > +      - const: simple-bus
> > +
> > +  reg: true  
> 
> How many entries?

Right, there is a single one, I'll constrain reg properly in v2.

> > +
> > +  ranges: true
> > +
> > +  '#address-cells':
> > +    const: 1
> > +
> > +  '#size-cells':
> > +    const: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - ranges
> > +
> > +# The DFX server may expose clocks described as subnodes
> > +additionalProperties: true  
> 
> addtionalProperties:
>   type: object
> 
> So that only nodes can be added.

Excellent, I never thought about this possibility, but of course that
works. Thanks a lot!

> 
> > +
> > +examples:
> > +  - |
> > +
> > +    #define MBUS_ID(target,attributes) (((target) << 24) | ((attributes) << 16))
> > +    bus@0 {
> > +        reg = <0 0>;
> > +        #address-cells = <2>;
> > +        #size-cells = <1>;
> > +
> > +        dfx-bus@...00000 {
> > +            compatible = "marvell,dfx-server", "simple-bus";
> > +            #address-cells = <1>;
> > +            #size-cells = <1>;
> > +            ranges = <0 MBUS_ID(0x08, 0x00) 0 0x100000>;
> > +            reg = <MBUS_ID(0x08, 0x00) 0 0x100000>;
> > +        };
> > +    };  


Thanks,
Miquèl