linux-kernel - Re: [PATCH v3] mmc: dt-bindings: Add reg/source

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Message-ID: <1506685837.5896.5.camel@mhfsdcap03>
Date:   Fri, 29 Sep 2017 19:50:37 +0800
From:   Chaotian Jing <chaotian.jing@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....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>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v3] mmc: dt-bindings: Add reg/source_cg/latch-ck for
 Mediatek MMC bindings

On Fri, 2017-09-29 at 13:11 +0200, Matthias Brugger wrote:
> 
> On 09/22/2017 02:03 PM, 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
> > Note that source_cg and mediatek,latch-ck are optional for some projects,
> > eg, MT2701 do not have source_cg, and MT2712 do not need
> > mediatek,latch-ck
> > 
> > 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..b934a29 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
> 
> NAK, this has to be:
> You have to add the fallback compatible ("mediatek,mt8135-mmc") to the binding 
> description as otherwise the driver does not get probed.
> 
> Regards,
> Matthias

Thanks for your comments, will add the fallback compatible
("mediatek,mt8135-mmc") to the binding in this patch.
but, is possible to remove the fallback compatible at next patch ?
eg, following patches will modify the driver like below:
static const struct of_device_id msdc_of_ids[] = {
        { .compatible = "mediatek,mt8135-mmc", .data = &mt8135_compat},
        { .compatible = "mediatek,mt8173-mmc", .data = &mt8173_compat},
};
then, there is no probe issue and remove the fallback compatible.
Thx!
> 
> > +- 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"
> >   - pinctrl-names: should be "default", "state_uhs"
> >   - pinctrl-0: should contain default/high speed pin ctrl
> >   - pinctrl-1: should contain uhs mode pin ctrl
> > @@ -30,6 +35,8 @@ Optional properties:
> >   - mediatek,hs400-cmd-resp-sel-rising:  HS400 command response sample selection
> >   				       If present,HS400 command responses are sampled on rising edges.
> >   				       If not present,HS400 command responses are sampled on falling edges.
> > +- mediatek,latch-ck: Some SoCs do not support enhance_rx, need set correct latch-ck to avoid data crc
> > +		     error caused by stop clock(fifo full)
> >   
> >   Examples:
> >   mmc0: mmc@...30000 {
> >