linux-kernel - Re: [PATCH v3 2/7] dt-bindings: mdf: ti,j721e-syscon.yaml: Add J721e system controller

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Date:   Mon, 18 May 2020 17:13:57 -0600
From:   Rob Herring <robh@...nel.org>
To:     Roger Quadros <rogerq@...com>
Cc:     Tero Kristo <t-kristo@...com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Nishanth Menon <nm@...com>, Sekhar Nori <nsekhar@...com>,
        Vignesh R <vigneshr@...com>, devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/7] dt-bindings: mdf: ti,j721e-syscon.yaml: Add J721e
 system controller

On Mon, May 18, 2020 at 8:51 AM Rob Herring <robh@...nel.org> wrote:
>
> On Fri, May 08, 2020 at 11:29:32AM +0300, Roger Quadros wrote:
> > Add DT binding schema for J721e system controller.
> >
> > Signed-off-by: Roger Quadros <rogerq@...com>
> > ---
> >  .../bindings/mfd/ti,j721e-syscon.yaml         | 69 +++++++++++++++++++
> >  1 file changed, 69 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mfd/ti,j721e-syscon.yaml
>
> Use the compatible string for filename.
>
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/ti,j721e-syscon.yaml b/Documentation/devicetree/bindings/mfd/ti,j721e-syscon.yaml
> > new file mode 100644
> > index 000000000000..e832fb43f884
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/ti,j721e-syscon.yaml
> > @@ -0,0 +1,69 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +# Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mfd/ti,j721e-syscon.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: TI J721e System Controller Registers R/W Device Tree Bindings
> > +
> > +description: |
> > +  This represents the Control Module registers (CTRL_MMR0) on the SoC.
> > +  System controller node represents a register region containing a set
> > +  of miscellaneous registers. The registers are not cohesive enough to
> > +  represent as any specific type of device. The typical use-case is
> > +  for some other node's driver, or platform-specific code, to acquire
> > +  a reference to the syscon node (e.g. by phandle, node path, or
> > +  search using a specific compatible value), interrogate the node (or
> > +  associated OS driver) to determine the location of the registers,
> > +  and access the registers directly.
> > +
> > +maintainers:
> > +  - Kishon Vijay Abraham I <kishon@...com>
> > +  - Roger Quadros <rogerq@...com
> > +
> > +allOf:
> > +  - $ref: "syscon.yaml#"
>
> Drop this as it is not needed.
>
> > +
> > +properties:
> > +  compatible:
> > +    anyOf:
> > +      - items:
> > +        - enum:
> > +          - ti,j721e-system-controller
> > +
> > +        - const: syscon
>
> What about simple-mfd?
>
> > +
> > +      - contains:
> > +          const: syscon
> > +        additionalItems: true
>
> Should be dropped.
>
> You are going to need a 'select' entry or this will match on any syscon
> or simple-mfd node:
>
> select:
>   properties:
>     compatible:
>       contains:
>         const: ti,j721e-system-controller
>   required:
>     - compatible

Sorry, forget the 'select' part (still should drop the 2nd clause).
I'd found a bug in what handles this automatically, but it's only when
you have 'simple-mfd' and not 'syscon'.

Rob