linux-kernel - Re: [PATCH 01/12] mmc: dt-bindings: update Mediatek MMC bindings

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Date:   Wed, 27 Sep 2017 00:33:59 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Chaotian Jing <chaotian.jing@...iatek.com>
Cc:     Rob Herring <robh@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        yong mao <yong.mao@...iatek.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Phong LE <ple@...libre.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH 01/12] mmc: dt-bindings: update Mediatek MMC bindings

On 14 September 2017 at 04:10, Chaotian Jing <chaotian.jing@...iatek.com> wrote:
> On Wed, 2017-09-13 at 09:10 -0500, Rob Herring wrote:
>> On Tue, Sep 12, 2017 at 05:07:41PM +0800, Chaotian Jing wrote:
>> > Change the comptiable for support of multi-platform
>> > Add description for reg
>> > Add description for source_cg
>> > Add description for mediatek,latch-ck
>>
>> This is at least the 3rd patch with exactly the same vague subject.
>> Please make the subject somewhat unique.
>>
> Thx, will change the subject at next version
>> >
>> > Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
>> > ---
>> >  Documentation/devicetree/bindings/mmc/mtk-sd.txt | 13 ++++++++++---
>> >  1 file changed, 10 insertions(+), 3 deletions(-)
>> >
>> > diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.txt b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
>> > index 4182ea3..405cd06 100644
>> > --- a/Documentation/devicetree/bindings/mmc/mtk-sd.txt
>> > +++ b/Documentation/devicetree/bindings/mmc/mtk-sd.txt
>> > @@ -7,10 +7,15 @@ This file documents differences between the core properties in mmc.txt
>> >  and the properties used by the msdc driver.
>> >
>> >  Required properties:
>> > -- compatible: Should be "mediatek,mt8173-mmc","mediatek,mt8135-mmc"
>> > +- compatible: value should be either of the following.
>> > +   "mediatek,mt8135-mmc": for mmc host ip compatible with mt8135
>> > +   "mediatek,mt8173-mmc": for mmc host ip compatible with mt8173
>> > +   "mediatek,mt2701-mmc": for mmc host ip compatible with mt2701
>> > +   "mediatek,mt2712-mmc": for mmc host ip compatible with mt2712
>> > +- reg: physical base address of the controller and length
>> >  - interrupts: Should contain MSDC interrupt number
>> > -- clocks: MSDC source clock, HCLK
>> > -- clock-names: "source", "hclk"
>> > +- clocks: MSDC source clock, HCLK, source_cg
>> > +- clock-names: "source", "hclk", "source_cg"
>>
>> All chips support source_cg? That's not backwards compatible for
>> existing compatible strings if the driver requires it.
> Not all chips support source_cg, for chips which do not support
> source_cg, no need source_cg here, and the driver will parse it
> to know if current chip support it.

In such case you must not add add a required binding for it. I think
that is what Rob is trying to point out for you.

[...]

Kind regards
Uffe