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

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Date:   Fri, 4 Aug 2017 11:44:10 +0800
From:   Guochun Mao <guochun.mao@...iatek.com>
To:     Rob Herring <robh@...nel.org>
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, 2017-08-03 at 12:47 -0500, Rob Herring wrote:
> 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.

OK, I'll corret the description in next version.
Thanks a lot.

Guochun


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