linux-kernel - Re: [PATCH 1/6] dt-bindings: mfd: ti,j721e-system-controller: Fix mux node errors

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Date:   Thu, 20 May 2021 10:19:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     devicetree@...r.kernel.org, Peter Rosin <peda@...ntia.se>,
        Wolfram Sang <wsa@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Lee Jones <lee.jones@...aro.org>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH 1/6] dt-bindings: mfd: ti,j721e-system-controller: Fix mux
 node errors

On Thu, May 20, 2021 at 9:42 AM Kishon Vijay Abraham I <kishon@...com> wrote:
>
> Hi Rob,
>
> On 19/05/21 4:58 am, Rob Herring wrote:
> > The ti,j721e-system-controller binding does not follow the standard mux
> > controller node name 'mux-controller' and the example is incomplete. Fix
> > these to avoid schema errors before the mux controller binding is
> > converted to schema.
> >
> > Cc: Lee Jones <lee.jones@...aro.org>
> > Cc: Kishon Vijay Abraham I <kishon@...com>
> > Cc: Roger Quadros <rogerq@...com>
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> >  .../mfd/ti,j721e-system-controller.yaml       | 19 +++++++++++++------
> >  1 file changed, 13 insertions(+), 6 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml b/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
> > index 19fcf59fd2fe..272832e9f8f2 100644
> > --- a/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
> > +++ b/Documentation/devicetree/bindings/mfd/ti,j721e-system-controller.yaml
> > @@ -43,12 +43,10 @@ properties:
> >
> >  patternProperties:
> >    # Optional children
> > -  "^serdes-ln-ctrl@[0-9a-f]+$":
> > +  "^mux-controller@[0-9a-f]+$":
> >      type: object
> > -    description: |
> > -      This is the SERDES lane control mux. It should follow the bindings
> > -      specified in
> > -      Documentation/devicetree/bindings/mux/reg-mux.txt
> > +    description:
> > +      This is the SERDES lane control mux.
> >
> >  required:
> >    - compatible
> > @@ -68,9 +66,18 @@ examples:
> >          #size-cells = <1>;
> >          ranges;
> >
> > -        serdes_ln_ctrl: serdes-ln-ctrl@...0 {
> > +        serdes_ln_ctrl: mux-controller@...0 {
> >              compatible = "mmio-mux";
> >              reg = <0x00004080 0x50>;
>
> "mmio-mux" compatible doesn't define using "reg" property. But a system
> can have multiple mux-controllers which would require us to use
> mux-controller@0, mux-controller@1,..

It does now in patch 3 as part of the schema conversion. It's optional
as getting folks to use 'reg' for syscon child nodes is an uphill
battle.

Rob
>
> And IIRC if we have "@", 'reg' will be a required required property.
> Would it be an issue here?
>
> Thanks
> Kishon