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Date:   Wed, 14 Jun 2023 15:58:05 +0100
From:   Conor Dooley <conor@kernel.org>
To:     Nicolas Ferre <nicolas.ferre@microchip.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Manikandan Muralidharan <manikandan.m@microchip.com>,
        lee@kernel.org, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
        alexandre.belloni@bootlin.com, claudiu.beznea@microchip.com,
        sam@ravnborg.org, bbrezillon@kernel.org, airlied@gmail.com,
        daniel@ffwll.ch, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, Hari.PrasathGE@microchip.com,
        Balamanikandan.Gunasundar@microchip.com,
        Durai.ManickamKR@microchip.com, Nayabbasha.Sayed@microchip.com,
        Dharma.B@microchip.com, Varshini.Rajendran@microchip.com,
        Balakrishnan.S@microchip.com
Subject: Re: [PATCH 1/9] dt-bindings: mfd: Add bindings for SAM9X7 LCD
 controller
Message-ID: <20230614-headset-ability-e4d90eeda5ed@spud>
References: <20230613070426.467389-1-manikandan.m@microchip.com>
 <20230613070426.467389-2-manikandan.m@microchip.com>
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On Wed, Jun 14, 2023 at 04:40:50PM +0200, Nicolas Ferre wrote:
> On 13/06/2023 at 20:21, Conor Dooley wrote:
> > On Tue, Jun 13, 2023 at 08:17:13PM +0200, Krzysztof Kozlowski wrote:
> > > On 13/06/2023 09:04, Manikandan Muralidharan wrote:
> > > > Add new compatible string for the XLCD controller on SAM9X7 SoC.
> > > >=20
> > > > Signed-off-by: Manikandan Muralidharan<manikandan.m@microchip.com>
> > > > ---
> > > >   Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt | 1 +
> > > >   1 file changed, 1 insertion(+)
> > > >=20
> > > > diff --git a/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt =
b/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
> > > > index 5f8880cc757e..7c77b6bf4adb 100644
> > > > --- a/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
> > > > +++ b/Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt
> > > > @@ -8,6 +8,7 @@ Required properties:
> > > >      "atmel,sama5d3-hlcdc"
> > > >      "atmel,sama5d4-hlcdc"
> > > >      "microchip,sam9x60-hlcdc"
> > > > +   "microchip,sam9x7-xlcdc"
> > > Google says sam9x7 is a series, not a SoC. Please add compatibles for
> > > specific SoCs, not for series.
> > We had this one a few weeks ago, see
> > https://lore.kernel.org/all/add5e49e-8416-ba9f-819a-da944938c05f@microc=
hip.com/
> > and its parents. Outcome of that seemed to be that using "sam9x7" was f=
ine.
>=20
> And it's where it begins to be funny, as the LCD is precisely one aspect
> where we differentiate between sam9x75, sam9x72 and sam9x70...

Oh dear, just my luck...

> So please Manikandan sort this out if difference between these chips will=
 be
> better handled with different compatibility string, in particular about /=
/,
> LVDS and MIPI-DSI variants!

Yeah, providing some information about what the differences actually are
would be good, for the same of the actually-knowledgeable-about-displays
folk in the audience (IOW, not me).
Probably then the display/atmel/hlcdc-dc.txt binding needs an update too?

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