linux-kernel - Re: [PATCH] dt-bindings: mtd: add new compatible strings for mtk nor controller

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Message-ID: <20170803174750.bipdynhyyyozzjk6@rob-hp-laptop>
Date:   Thu, 3 Aug 2017 12:47:50 -0500
From:   Rob Herring <robh@...nel.org>
To:     Guochun Mao <guochun.mao@...iatek.com>
Cc:     Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Richard Weinberger <richard@....at>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        David Woodhouse <dwmw2@...radead.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] dt-bindings: mtd: add new compatible strings for mtk nor
 controller

On Thu, Aug 03, 2017 at 10:16:42AM +0800, Guochun Mao wrote:
> Hi Cyrille,
> 
> On Wed, 2017-08-02 at 17:31 +0200, Cyrille Pitchen wrote:
> > Hi Guochun,
> > 
> > Le 02/08/2017 à 10:36, Boris Brezillon a écrit :
> > > Hi Matthias,
> > > 
> > > On Tue, 1 Aug 2017 14:33:22 +0200
> > > Matthias Brugger <matthias.bgg@...il.com> wrote:
> > > 
> > >> On 07/25/2017 04:10 AM, Guochun Mao wrote:
> > >>> Add "mediatek,mt2712-nor" and "mediatek,mt7622-nor"
> > >>> for nor flash node's compatible strings.
> > >>>
> > >>> Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> > >>> Signed-off-by: Guochun Mao <guochun.mao@...iatek.com>
> > >>> ---
> > >>>   .../devicetree/bindings/mtd/mtk-quadspi.txt        |    2 ++
> > >>>   1 file changed, 2 insertions(+)
> > >>>
> > >>> diff --git a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt b/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt
> > >>> index 5ded66a..9845ff4 100644
> > >>> --- a/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt
> > >>> +++ b/Documentation/devicetree/bindings/mtd/mtk-quadspi.txt
> > >>> @@ -3,6 +3,8 @@
> > >>>   Required properties:
> > >>>   - compatible: 	  The possible values are:
> > >>>   		  "mediatek,mt2701-nor"
> > >>> +		  "mediatek,mt2712-nor"
> > >>> +		  "mediatek,mt7622-nor"
> > >>>   		  "mediatek,mt7623-nor"
> > >>>   		  "mediatek,mt8173-nor"
> > >>>   		  For mt8173, compatible should be "mediatek,mt8173-nor".
> > >>>
> > 
> > There should be another patch to update the mtk_nor_of_ids[] array in
> > the mtk-quadspi.c driver, shouldn't it?
> > 
> > Currently, I only see the "mediatek,mt8173-nor" compatible string at the
> > driver side. The driver and its documentation should be aligned and both
> > patches should be applied at the same time.
> 
> > Best regards,
> > 
> > Cyrille
> 
> 
> From my designer's info, these IPs' nor controller could use same
> driver, and I had verified it. I think there's no need to update
> mtk_nor_of_ids[], unless we find difference between these IPs(exactly
> compared with mt8173).
> How do you think?

That is perfectly fine, but then the documentation needs to be explicit 
as to what are the fallback compatibles. It's one valid combination per 
line, not 1 compatible string per line.

Rob

> 
> And, we will add dts patches for new SOCs, are these patches should
> applied with this documentation?
> 
> Best regards,
> Guochun
>