linux-kernel - Re: [PATCH 1/5] dt-bindings: memory: fsl: convert ifc binding to yaml schema

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Date:   Thu, 14 Oct 2021 07:46:50 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Li Yang <leoyang.li@....com>, Shawn Guo <shawnguo@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] dt-bindings: memory: fsl: convert ifc binding to yaml schema

On Mon, Oct 4, 2021 at 4:31 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...onical.com> wrote:
>
> On 01/10/2021 18:17, Li Yang wrote:
> > On Fri, Oct 1, 2021 at 5:01 AM Krzysztof Kozlowski
> > <krzysztof.kozlowski@...onical.com> wrote:
> >>
>
> (...)
>
> >>> +
> >>> +  interrupts:
> >>> +    minItems: 1
> >>> +    maxItems: 2
> >>> +    description: |
> >>> +      IFC may have one or two interrupts.  If two interrupt specifiers are
> >>> +      present, the first is the "common" interrupt (CM_EVTER_STAT), and the
> >>> +      second is the NAND interrupt (NAND_EVTER_STAT).  If there is only one,
> >>> +      that interrupt reports both types of event.
> >>> +
> >>> +  little-endian:
> >>> +    $ref: '/schemas/types.yaml#/definitions/flag'
> >>
> >> type: boolean
> >
> > It will not have a true or false value, but only present or not.  Is
> > the boolean type taking care of this too?
>
> boolean is for a property which does not accept values and true/false
> depends on its presence.
> See:
> Documentation/devicetree/bindings/phy/lantiq,vrx200-pcie-phy.yaml
> Documentation/devicetree/bindings/thermal/qoriq-thermal.yaml

They are equivalent, so either can be used.

Really what is needed here is a common schema for the endianness
properties defining the type once. Then any binding using a property
can just do 'little-endian: true'.

Rob