netdev - Re: [PATCH 2/3] dt-bindings: mfd: add "fsl,ls1028a-qds-qixis-i2c" compatible to sl28cpld

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Message-ID: <20220211132410.3qldvlpznlrxsgzg@skbuf>
Date:   Fri, 11 Feb 2022 13:24:11 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Rob Herring <robh@...nel.org>
CC:     Shawn Guo <shawnguo@...nel.org>, Lee Jones <lee.jones@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Leo Li <leoyang.li@....com>, Michael Walle <michael@...le.cc>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] dt-bindings: mfd: add "fsl,ls1028a-qds-qixis-i2c"
 compatible to sl28cpld

On Fri, Feb 11, 2022 at 07:01:42AM -0600, Rob Herring wrote:
> On Thu, Jan 27, 2022 at 07:21:04PM +0200, Vladimir Oltean wrote:
> > The LS1028A-QDS QIXIS FPGA has no problem working with the
> > simple-mfd-i2c.c driver, so extend the list of compatible strings to
> > include that part.
> > 
> > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > ---
> >  Documentation/devicetree/bindings/mfd/kontron,sl28cpld.yaml | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/kontron,sl28cpld.yaml b/Documentation/devicetree/bindings/mfd/kontron,sl28cpld.yaml
> > index eb3b43547cb6..8c1216eb36ee 100644
> > --- a/Documentation/devicetree/bindings/mfd/kontron,sl28cpld.yaml
> > +++ b/Documentation/devicetree/bindings/mfd/kontron,sl28cpld.yaml
> > @@ -16,7 +16,9 @@ description: |
> >  
> >  properties:
> >    compatible:
> > -    const: kontron,sl28cpld
> > +    enum:
> > +      - fsl,ls1028a-qds-qixis-i2c
> > +      - kontron,sl28cpld
> 
> Is there some relationship between these besides happening to use the 
> same driver? Sharing a generic driver is not a reason to have the same 
> binding doc.
> 
> Your DT has a mux-controller which is undocuemnted in this binding.
> 
> Rob

I'd guess they are both programmable FPGA's/CPLD's that are used for
board control. What I don't know is whether the sources for the Kontron
bit stream are derived in any way from the QIXIS.

I can look into adding a separate binding doc for the QIXIS anyway.